{"id":8,"date":"2026-06-10T16:43:32","date_gmt":"2026-06-10T16:43:32","guid":{"rendered":"https:\/\/fishingtoolbox.com\/?page_id=8"},"modified":"2026-06-10T19:06:18","modified_gmt":"2026-06-10T19:06:18","slug":"fishing-tools","status":"publish","type":"page","link":"https:\/\/fishingtoolbox.com\/","title":{"rendered":"Free Fishing Calculators &#038; Tools"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A free, no-login toolbox for anglers. Estimate a fish&#8217;s weight, set your drag, work out trolling depth, find the best bite times, match line capacity, and convert the numbers you actually use on the water. Everything runs right in your browser, on your phone or desktop.<\/p>\n\n\n<div style=\"width:100%;margin:0 auto\">\n<iframe id=\"ftbframe\" title=\"Fishing Toolbox\" scrolling=\"no\" style=\"width:100%;border:0;display:block;min-height:1150px;overflow:hidden\" srcdoc=\"<!DOCTYPE html>\n<html lang=&quot;en&quot;>\n<head>\n<meta charset=&quot;UTF-8&quot;>\n<meta name=&quot;viewport&quot; content=&quot;width=device-width, initial-scale=1.0&quot;>\n<title>Fishing Toolbox \u2014 Free Calculators for Anglers<\/title>\n<style>\n  :root{\n    --navy:#0b2a3a; --deep:#103c52; --teal:#1b7a8c; --aqua:#28a3b8;\n    --sand:#f4efe6; --card:#ffffff; --ink:#13303d; --muted:#5b7480;\n    --accent:#f0a93b; --line:#d9e2e6; --good:#1f8a5b;\n  }\n  *{box-sizing:border-box;margin:0;padding:0}\n  body{\n    font-family:-apple-system,BlinkMacSystemFont,&quot;Segoe UI&quot;,Roboto,Helvetica,Arial,sans-serif;\n    background:linear-gradient(180deg,#0b2a3a 0%,#103c52 220px,#eef3f4 220px,#eef3f4 100%);\n    color:var(--ink); 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margin:22px auto 0; padding:0 14px; }\n  .adslot .box{\n    border:1.5px dashed #b9c7cd; border-radius:12px; padding:16px; text-align:center;\n    color:#8aa0a8; font-size:.8rem; background:rgba(255,255,255,.5);\n  }\n  footer{max-width:760px;margin:26px auto 0;padding:0 16px;text-align:center;color:var(--muted);font-size:.78rem;line-height:1.6}\n  .disclaim{margin-top:8px;font-size:.72rem;color:#90a4ac}\n<\/style>\n<\/head>\n<body>\n<header>\n  <div class=&quot;logo&quot;>Fishing <span>Toolbox<\/span><\/div>\n  <div class=&quot;tag&quot;>Free, no-login calculators for anglers \ud83c\udfa3<\/div>\n<\/header>\n<div class=&quot;wrap&quot;>\n  <nav class=&quot;tabs&quot; id=&quot;tabs&quot;>\n    <button class=&quot;active&quot; data-tab=&quot;weight&quot;>Fish Weight<\/button>\n    <button data-tab=&quot;capacity&quot;>Line Capacity<\/button>\n    <button data-tab=&quot;drag&quot;>Drag Setting<\/button>\n    <button data-tab=&quot;sun&quot;>Sunrise\/Sunset<\/button>\n    <button data-tab=&quot;trolling&quot;>Trolling Depth<\/button>\n    <button data-tab=&quot;watertemp&quot;>Water Temp Guide<\/button>\n    <button data-tab=&quot;convert&quot;>Converters<\/button>\n  <\/nav>\n  <section class=&quot;panel active card&quot; id=&quot;weight&quot;>\n    <h2>Fish Weight Estimator<\/h2>\n    <p class=&quot;sub&quot;>Estimate a fish&#8217;s weight without a scale. Measure total length and girth (the distance around the body at its fattest point). Girth makes this far more accurate \u2014 but you can estimate from length alone too.<\/p>\n    <label>Units<\/label>\n    <div class=&quot;seg&quot; id=&quot;wUnit&quot; style=&quot;margin-bottom:14px&quot;>\n      <button class=&quot;on&quot; data-u=&quot;in&quot;>Inches<\/button>\n      <button data-u=&quot;cm&quot;>Centimeters<\/button>\n    <\/div>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Species<\/label>\n        <select id=&quot;wSpecies&quot;>\n          <option value=&quot;800&quot;>Bass (largemouth\/smallmouth)<\/option>\n          <option value=&quot;900&quot;>Trout<\/option>\n          <option value=&quot;900&quot;>Walleye<\/option>\n          <option value=&quot;900&quot;>Pike \/ Musky<\/option>\n          <option value=&quot;800&quot;>Catfish<\/option>\n          <option value=&quot;800&quot;>Panfish (crappie, bluegill)<\/option>\n          <option value=&quot;800&quot;>Other \/ general<\/option>\n        <\/select>\n      <\/div>\n    <\/div>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Length<\/label>\n        <input type=&quot;number&quot; id=&quot;wLen&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 18&quot;>\n      <\/div>\n      <div class=&quot;field&quot;>\n        <label>Girth <span style=&quot;font-weight:400;color:var(--muted)&quot;>(optional)<\/span><\/label>\n        <input type=&quot;number&quot; id=&quot;wGirth&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 12&quot;>\n      <\/div>\n    <\/div>\n    <p class=&quot;hint&quot;>No girth? Leave it blank for a rougher length-only estimate.<\/p>\n    <div class=&quot;result&quot; id=&quot;wResult&quot; style=&quot;display:none&quot;>\n      <div class=&quot;big&quot; id=&quot;wBig&quot;>\u2014<\/div>\n      <div class=&quot;small&quot; id=&quot;wSmall&quot;><\/div>\n      <div class=&quot;note&quot; id=&quot;wNote&quot;><\/div>\n    <\/div>\n  <\/section>\n  <section class=&quot;panel card&quot; id=&quot;capacity&quot;>\n    <h2>Reel Line Capacity<\/h2>\n    <p class=&quot;sub&quot;>Respooling with a different line? Your reel is rated for one line, but a thinner line (like braid) fits much more. Enter the rated capacity printed on your reel, then the line you actually want to spool.<\/p>\n    <label style=&quot;margin-bottom:10px&quot;>Your reel&#8217;s rated capacity<\/label>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Rated length (yards)<\/label>\n        <input type=&quot;number&quot; id=&quot;cLen&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 200&quot;>\n      <\/div>\n      <div class=&quot;field&quot;>\n        <label>Rated line diameter (mm)<\/label>\n        <input type=&quot;number&quot; id=&quot;cDia&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 0.30&quot; step=&quot;0.001&quot;>\n      <\/div>\n    <\/div>\n    <label style=&quot;margin-bottom:10px&quot;>New line you want to spool<\/label>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>New line diameter (mm)<\/label>\n        <input type=&quot;number&quot; id=&quot;cNew&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 0.17&quot; step=&quot;0.001&quot;>\n      <\/div>\n    <\/div>\n    <p class=&quot;hint&quot;>Line diameter (mm) is printed on the spool\/box. Common: 0.25\u20130.35 mm mono, 0.12\u20130.20 mm braid.<\/p>\n    <div class=&quot;result&quot; id=&quot;cResult&quot; style=&quot;display:none&quot;>\n      <div class=&quot;big&quot; id=&quot;cBig&quot;>\u2014<\/div>\n      <div class=&quot;small&quot; id=&quot;cSmall&quot;><\/div>\n      <div class=&quot;note&quot;>Estimate assumes the spool is filled to the same level.<\/div>\n    <\/div>\n  <\/section>\n  <section class=&quot;panel card&quot; id=&quot;drag&quot;>\n    <h2>Drag Setting<\/h2>\n    <p class=&quot;sub&quot;>A good starting drag is one-quarter to one-third of your line&#8217;s breaking strength. Too tight and the line snaps; too loose and you can&#8217;t set the hook. Enter your line&#8217;s pound-test rating.<\/p>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Line strength (lb test)<\/label>\n        <input type=&quot;number&quot; id=&quot;dTest&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 20&quot;>\n      <\/div>\n    <\/div>\n    <p class=&quot;hint&quot;>Set drag with a scale at the line, rod tip up. Lighten it for fragile leaders or hard-fighting fish near structure.<\/p>\n    <div class=&quot;result&quot; id=&quot;dResult&quot; style=&quot;display:none&quot;>\n      <div class=&quot;big&quot; id=&quot;dBig&quot;>\u2014<\/div>\n      <div class=&quot;small&quot; id=&quot;dSmall&quot;><\/div>\n      <div class=&quot;note&quot;>Range = 25%\u201333% of line test. Start at the low end and adjust.<\/div>\n    <\/div>\n  <\/section>\n  <section class=&quot;panel card&quot; id=&quot;sun&quot;>\n    <h2>Sunrise, Sunset &amp;amp; Bite Windows<\/h2>\n    <p class=&quot;sub&quot;>Dawn and dusk are prime feeding times for most fish. Enter your location and date to get exact sun times plus the best low-light windows to be on the water.<\/p>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Latitude<\/label>\n        <input type=&quot;number&quot; id=&quot;sLat&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 40.71&quot; step=&quot;0.0001&quot;>\n      <\/div>\n      <div class=&quot;field&quot;>\n        <label>Longitude<\/label>\n        <input type=&quot;number&quot; id=&quot;sLng&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. -74.01&quot; step=&quot;0.0001&quot;>\n      <\/div>\n    <\/div>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Date<\/label>\n        <input type=&quot;date&quot; id=&quot;sDate&quot;>\n      <\/div>\n      <div class=&quot;field&quot; style=&quot;display:flex;align-items:flex-end&quot;>\n        <button id=&quot;sGeo&quot; style=&quot;width:100%;padding:11px;border:none;border-radius:10px;background:var(--teal);color:#fff;font-weight:600;cursor:pointer&quot;>Use my location<\/button>\n      <\/div>\n    <\/div>\n    <p class=&quot;hint&quot;>Longitude is negative for the Americas (west of Greenwich). Times shown in your device&#8217;s local time zone.<\/p>\n    <div class=&quot;result&quot; id=&quot;sResult&quot; style=&quot;display:none&quot;>\n      <div class=&quot;big&quot; id=&quot;sBig&quot;>\u2014<\/div>\n      <div class=&quot;small&quot; id=&quot;sSmall&quot;><\/div>\n      <div class=&quot;note&quot; id=&quot;sNote&quot;><\/div>\n    <\/div>\n  <\/section>\n  <section class=&quot;panel card&quot; id=&quot;trolling&quot;>\n    <h2>Trolling Depth (Lead Core)<\/h2>\n    <p class=&quot;sub&quot;>Estimate how deep your lure runs on lead-core line using the angler&#8217;s &quot;rule of fives.&quot; Each color of standard 18&amp;nbsp;lb lead core is 30&amp;nbsp;ft (10&amp;nbsp;yards) and sinks about 5&amp;nbsp;ft per color at ~2&amp;nbsp;mph.<\/p>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Colors of lead core out<\/label>\n        <input type=&quot;number&quot; id=&quot;tColors&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 5&quot; step=&quot;0.5&quot;>\n      <\/div>\n      <div class=&quot;field&quot;>\n        <label>Trolling speed<\/label>\n        <select id=&quot;tSpeed&quot;>\n          <option value=&quot;6&quot;>Slow (~1.5 mph)<\/option>\n          <option value=&quot;5&quot; selected>Moderate (~2 mph)<\/option>\n          <option value=&quot;3&quot;>Fast (~2.5+ mph)<\/option>\n        <\/select>\n      <\/div>\n    <\/div>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Line type<\/label>\n        <select id=&quot;tType&quot;>\n          <option value=&quot;1&quot;>Standard 18 lb lead core<\/option>\n          <option value=&quot;1.4&quot;>Thin (e.g. Sufix 832) \u2014 sinks ~40% deeper<\/option>\n        <\/select>\n      <\/div>\n    <\/div>\n    <p class=&quot;hint&quot;>A rough field estimate \u2014 actual depth shifts with speed, lure weight, and water. Always verify with a depth finder when it matters.<\/p>\n    <div class=&quot;result&quot; id=&quot;tResult&quot; style=&quot;display:none&quot;>\n      <div class=&quot;big&quot; id=&quot;tBig&quot;>\u2014<\/div>\n      <div class=&quot;small&quot; id=&quot;tSmall&quot;><\/div>\n      <div class=&quot;note&quot;>Based on the lead-core &quot;rule of fives.&quot; Slower = deeper, faster = shallower.<\/div>\n    <\/div>\n  <\/section>\n  <section class=&quot;panel card&quot; id=&quot;watertemp&quot;>\n    <h2>Water Temp Species Guide<\/h2>\n    <p class=&quot;sub&quot;>Fish feed hardest inside a preferred temperature band. Enter the current water temperature and see which species are likely active right now.<\/p>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Water temperature<\/label>\n        <input type=&quot;number&quot; id=&quot;wtVal&quot; inputmode=&quot;decimal&quot; placeholder=&quot;e.g. 68&quot;>\n      <\/div>\n      <div class=&quot;field&quot;>\n        <label>Units<\/label>\n        <div class=&quot;seg&quot; id=&quot;wtUnit&quot;>\n          <button class=&quot;on&quot; data-u=&quot;F&quot;>\u00b0F<\/button>\n          <button data-u=&quot;C&quot;>\u00b0C<\/button>\n        <\/div>\n      <\/div>\n    <\/div>\n    <p class=&quot;hint&quot;>Ranges are typical North American freshwater guidelines; fish still feed outside them, just less aggressively.<\/p>\n    <div class=&quot;conv-out&quot; id=&quot;wtOut&quot; style=&quot;margin-top:14px&quot;><\/div>\n  <\/section>\n  <section class=&quot;panel card&quot; id=&quot;convert&quot;>\n    <h2>Unit Converters<\/h2>\n    <p class=&quot;sub&quot;>Quick, exact conversions for the numbers anglers deal with most.<\/p>\n    <label>Type<\/label>\n    <div class=&quot;seg&quot; id=&quot;convType&quot; style=&quot;margin-bottom:16px&quot;>\n      <button class=&quot;on&quot; data-c=&quot;length&quot;>Length<\/button>\n      <button data-c=&quot;weight&quot;>Weight<\/button>\n      <button data-c=&quot;temp&quot;>Water temp<\/button>\n    <\/div>\n    <div class=&quot;row&quot;>\n      <div class=&quot;field&quot;>\n        <label>Value<\/label>\n        <input type=&quot;number&quot; id=&quot;convVal&quot; inputmode=&quot;decimal&quot; placeholder=&quot;Enter a number&quot;>\n      <\/div>\n      <div class=&quot;field&quot;>\n        <label>From<\/label>\n        <select id=&quot;convFrom&quot;><\/select>\n      <\/div>\n    <\/div>\n    <div class=&quot;conv-out&quot; id=&quot;convOut&quot;><\/div>\n  <\/section>\n<\/div>\n<div class=&quot;adslot&quot;><div class=&quot;box&quot;>Advertisement space \u2014 your ad network code goes here<\/div><\/div>\n<footer>\n  Fishing Toolbox \u2014 free calculators for fishermen. Bookmark &amp;amp; share.\n  <div class=&quot;disclaim&quot;>Estimates only. Weight figures are typically within \u00b15\u201310% with accurate girth; length-only estimates are rougher. Always follow local regulations for official measurements.<\/div>\n<\/footer>\n<script>\nconst tabs = document.getElementById('tabs');\ntabs.addEventListener('click', e=>{\n  const b = e.target.closest('button'); if(!b) return;\n  document.querySelectorAll('#tabs button').forEach(x=>x.classList.remove('active'));\n  document.querySelectorAll('.panel').forEach(x=>x.classList.remove('active'));\n  b.classList.add('active');\n  document.getElementById(b.dataset.tab).classList.add('active');\n});\nlet wUnit = 'in';\ndocument.getElementById('wUnit').addEventListener('click', e=>{\n  const b=e.target.closest('button'); if(!b) return;\n  document.querySelectorAll('#wUnit button').forEach(x=>x.classList.remove('on'));\n  b.classList.add('on'); wUnit=b.dataset.u; calcWeight();\n});\n['wLen','wGirth','wSpecies'].forEach(id=>document.getElementById(id).addEventListener('input',calcWeight));\nconst lenOnlyK = {'Bass (largemouth\/smallmouth)':1600,'Trout':3500,'Walleye':2700,'Pike \/ Musky':3500,'Catfish':2200,'Panfish (crappie, bluegill)':1200,'Other \/ general':2000};\nfunction calcWeight(){\n  const sel = document.getElementById('wSpecies');\n  const factor = parseFloat(sel.value);\n  const speciesName = sel.options[sel.selectedIndex].text;\n  let L = parseFloat(document.getElementById('wLen').value);\n  let G = parseFloat(document.getElementById('wGirth').value);\n  const res=document.getElementById('wResult');\n  if(!L || L<=0){ res.style.display='none'; return; }\n  if(wUnit==='cm'){ L=L\/2.54; if(G) G=G\/2.54; }\n  let lbs, note;\n  if(G &amp;&amp; G>0){ lbs = (L * G * G) \/ factor; note = 'Formula: Length \u00d7 Girth\u00b2 \u00f7 '+factor+' (girth method \u2014 most accurate).'; }\n  else { const k = lenOnlyK[speciesName] || 2000; lbs = (L*L*L)\/k; note = 'Length-only estimate (no girth). Add girth for a much better number.'; }\n  const kg = lbs*0.453592; const oz = lbs*16;\n  res.style.display='block';\n  document.getElementById('wBig').textContent = lbs.toFixed(2)+' lb';\n  document.getElementById('wSmall').textContent = '\u2248 '+kg.toFixed(2)+' kg  \u00b7  '+oz.toFixed(0)+' oz';\n  document.getElementById('wNote').textContent = note;\n}\n['cLen','cDia','cNew'].forEach(id=>document.getElementById(id).addEventListener('input',calcCap));\nfunction calcCap(){\n  const L=parseFloat(document.getElementById('cLen').value);\n  const d0=parseFloat(document.getElementById('cDia').value);\n  const d1=parseFloat(document.getElementById('cNew').value);\n  const res=document.getElementById('cResult');\n  if(!L||!d0||!d1||d1<=0){ res.style.display='none'; return; }\n  const newLen = L * (d0*d0)\/(d1*d1); const mult = (d0*d0)\/(d1*d1);\n  res.style.display='block';\n  document.getElementById('cBig').textContent = Math.round(newLen)+' yd';\n  document.getElementById('cSmall').textContent = '\u2248 '+Math.round(newLen*0.9144)+' m  \u00b7  '+mult.toFixed(2)+'\u00d7 the rated capacity';\n}\ndocument.getElementById('dTest').addEventListener('input',calcDrag);\nfunction calcDrag(){\n  const t=parseFloat(document.getElementById('dTest').value);\n  const res=document.getElementById('dResult');\n  if(!t||t<=0){ res.style.display='none'; return; }\n  const low=t*0.25, high=t*0.33;\n  res.style.display='block';\n  document.getElementById('dBig').textContent = low.toFixed(1)+'\u2013'+high.toFixed(1)+' lb';\n  document.getElementById('dSmall').textContent = 'Recommended drag range for '+t+' lb line';\n}\nconst sDate=document.getElementById('sDate');\nsDate.valueAsDate=new Date();\n['sLat','sLng','sDate'].forEach(id=>document.getElementById(id).addEventListener('input',calcSun));\ndocument.getElementById('sGeo').addEventListener('click',()=>{\n  if(!navigator.geolocation){ alert('Geolocation not available \u2014 enter coordinates manually.'); return; }\n  navigator.geolocation.getCurrentPosition(p=>{ document.getElementById('sLat').value=p.coords.latitude.toFixed(4); document.getElementById('sLng').value=p.coords.longitude.toFixed(4); calcSun(); }, ()=>alert('Could not get location \u2014 enter coordinates manually.'));\n});\nfunction dayOfYear(d){ const start=new Date(d.getFullYear(),0,0); return Math.floor((d-start)\/86400000); }\nfunction mod(a,b){return ((a%b)+b)%b;}\nfunction sunUTC(date,lat,lng,sunrise){\n  const D2R=Math.PI\/180, R2D=180\/Math.PI, zenith=90.833;\n  const N=dayOfYear(date); const lngHour=lng\/15;\n  const t = sunrise ? N+((6-lngHour)\/24) : N+((18-lngHour)\/24);\n  let M=(0.9856*t)-3.289;\n  let L=M+(1.916*Math.sin(M*D2R))+(0.020*Math.sin(2*M*D2R))+282.634; L=mod(L,360);\n  let RA=R2D*Math.atan(0.91764*Math.tan(L*D2R)); RA=mod(RA,360);\n  RA=RA+((Math.floor(L\/90)*90)-(Math.floor(RA\/90)*90)); RA=RA\/15;\n  const sinDec=0.39782*Math.sin(L*D2R); const cosDec=Math.cos(Math.asin(sinDec));\n  const cosH=(Math.cos(zenith*D2R)-(sinDec*Math.sin(lat*D2R)))\/(cosDec*Math.cos(lat*D2R));\n  if(cosH>1) return 'never_rises'; if(cosH<-1) return 'never_sets';\n  let H = sunrise ? 360-R2D*Math.acos(cosH) : R2D*Math.acos(cosH); H=H\/15;\n  const T=H+RA-(0.06571*t)-6.622; return mod(T-lngHour,24);\n}\nfunction fmtLocal(utcHours,date){\n  const offMin=date.getTimezoneOffset();\n  let local=mod(utcHours-offMin\/60,24);\n  let h=Math.floor(local), m=Math.round((local-h)*60);\n  if(m===60){m=0;h=(h+1)%24;}\n  const ap=h<12?'AM':'PM'; let hh=h%12; if(hh===0)hh=12;\n  return hh+':'+String(m).padStart(2,'0')+' '+ap;\n}\nfunction shiftFmt(utcHours,date,deltaMin){ return fmtLocal(mod(utcHours+deltaMin\/60,24),date); }\nfunction calcSun(){\n  const lat=parseFloat(document.getElementById('sLat').value);\n  const lng=parseFloat(document.getElementById('sLng').value);\n  const dv=document.getElementById('sDate').value;\n  const res=document.getElementById('sResult');\n  if(isNaN(lat)||isNaN(lng)||!dv){ res.style.display='none'; return; }\n  const date=new Date(dv+'T12:00:00');\n  const sr=sunUTC(date,lat,lng,true); const ss=sunUTC(date,lat,lng,false);\n  res.style.display='block';\n  if(typeof sr==='string'||typeof ss==='string'){\n    document.getElementById('sBig').textContent = sr==='never_rises'?'Sun stays down':'Sun stays up';\n    document.getElementById('sSmall').textContent='No standard sunrise\/sunset at this latitude on this date.';\n    document.getElementById('sNote').textContent=''; return;\n  }\n  document.getElementById('sBig').textContent='\u2600 '+fmtLocal(sr,date)+'   \ud83c\udf07 '+fmtLocal(ss,date);\n  document.getElementById('sSmall').textContent='Sunrise &amp; sunset (your local time)';\n  document.getElementById('sNote').innerHTML='Prime morning bite: <b>'+shiftFmt(sr,date,-45)+' \u2013 '+shiftFmt(sr,date,60)+'<\/b><br>Prime evening bite: <b>'+shiftFmt(ss,date,-60)+' \u2013 '+shiftFmt(ss,date,45)+'<\/b>';\n}\ncalcSun();\n['tColors','tSpeed','tType'].forEach(id=>document.getElementById(id).addEventListener('input',calcTroll));\nfunction calcTroll(){\n  const c=parseFloat(document.getElementById('tColors').value);\n  const perColor=parseFloat(document.getElementById('tSpeed').value);\n  const typeMult=parseFloat(document.getElementById('tType').value);\n  const res=document.getElementById('tResult');\n  if(!c||c<=0){ res.style.display='none'; return; }\n  const depth=c*perColor*typeMult;\n  res.style.display='block';\n  document.getElementById('tBig').textContent='\u2248 '+depth.toFixed(0)+' ft deep';\n  document.getElementById('tSmall').textContent=c+' color'+(c===1?'':'s')+' out ('+(c*30)+' ft of lead core) + leader';\n}\ncalcTroll();\nconst species=[['Largemouth Bass',65,80,72,78],['Smallmouth Bass',60,75,65,70],['Walleye',55,70,60,65],['Northern Pike',55,70,60,65],['Muskie',60,72,63,68],['Rainbow Trout',52,64,55,60],['Brown Trout',54,67,56,62],['Brook Trout',50,60,52,56],['Crappie',58,72,65,70],['Bluegill \/ Sunfish',65,80,70,75],['Yellow Perch',55,68,60,65],['Channel Catfish',70,85,75,85],['Striped Bass',55,68,60,65],['Salmon',50,60,53,57]];\nlet wtUnit='F';\ndocument.getElementById('wtUnit').addEventListener('click',e=>{\n  const b=e.target.closest('button'); if(!b) return;\n  document.querySelectorAll('#wtUnit button').forEach(x=>x.classList.remove('on'));\n  b.classList.add('on'); wtUnit=b.dataset.u; calcWT();\n});\ndocument.getElementById('wtVal').addEventListener('input',calcWT);\nfunction calcWT(){\n  let v=parseFloat(document.getElementById('wtVal').value);\n  const out=document.getElementById('wtOut'); out.innerHTML='';\n  if(isNaN(v)) return;\n  const f = wtUnit==='C' ? v*9\/5+32 : v;\n  const scored=species.map(s=>{ let status,rank; if(f>=s[3] &amp;&amp; f<=s[4]){status='Prime';rank=0;} else if(f>=s[1] &amp;&amp; f<=s[2]){status='Active';rank=1;} else {status='Slow';rank=2;} return {name:s[0],status,rank,lo:s[1],hi:s[2]}; }).sort((a,b)=>a.rank-b.rank || a.name.localeCompare(b.name));\n  scored.forEach(s=>{ const cls = s.status==='Prime'?'b-prime':s.status==='Active'?'b-active':'b-slow'; const d=document.createElement('div'); d.className='line'; d.innerHTML='<b>'+s.name+'<\/b><span class=&quot;rng&quot;>'+s.lo+'\u2013'+s.hi+'\u00b0F<\/span><span class=&quot;badge '+cls+'&quot;>'+s.status+'<\/span>'; out.appendChild(d); });\n}\nconst convUnits = { length:{ base:'m', units:{ 'Inches':0.0254,'Feet':0.3048,'Centimeters':0.01,'Meters':1,'Yards':0.9144 } }, weight:{ base:'kg', units:{ 'Ounces':0.0283495,'Pounds':0.453592,'Grams':0.001,'Kilograms':1 } }, temp:{ special:true } };\nlet convCur='length';\nconst convFrom=document.getElementById('convFrom'); const convVal=document.getElementById('convVal'); const convOut=document.getElementById('convOut');\ndocument.getElementById('convType').addEventListener('click',e=>{ const b=e.target.closest('button'); if(!b) return; document.querySelectorAll('#convType button').forEach(x=>x.classList.remove('on')); b.classList.add('on'); convCur=b.dataset.c; buildConv(); });\nconvVal.addEventListener('input',renderConv); convFrom.addEventListener('change',renderConv);\nfunction buildConv(){ convFrom.innerHTML=''; if(convCur==='temp'){ ['Fahrenheit','Celsius'].forEach(u=>convFrom.add(new Option(u,u))); } else { Object.keys(convUnits[convCur].units).forEach(u=>convFrom.add(new Option(u,u))); } renderConv(); }\nfunction renderConv(){\n  const v=parseFloat(convVal.value); convOut.innerHTML=''; if(isNaN(v)) return;\n  if(convCur==='temp'){ const from=convFrom.value; let c = from==='Fahrenheit' ? (v-32)*5\/9 : v; let f = from==='Fahrenheit' ? v : v*9\/5+32; addLine('Fahrenheit', f.toFixed(1)+' \u00b0F'); addLine('Celsius', c.toFixed(1)+' \u00b0C'); return; }\n  const set=convUnits[convCur].units; const baseVal = v*set[convFrom.value];\n  Object.keys(set).forEach(u=>{ if(u===convFrom.value) return; addLine(u,(baseVal\/set[u]).toLocaleString(undefined,{maximumFractionDigits:4})); });\n}\nfunction addLine(label,val){ const d=document.createElement('div'); d.className='line'; d.innerHTML='<span>'+label+'<\/span><b>'+val+'<\/b>'; convOut.appendChild(d); }\nbuildConv();\n<\/script>\n<\/body>\n<\/html>&#8220;><\/iframe>\n<script>(function(){var f=document.getElementById(\"ftbframe\");function r(){try{var h=f.contentWindow.document.body.scrollHeight;if(h)f.style.height=(h+30)+\"px\";}catch(e){}}f.addEventListener(\"load\",r);setInterval(r,700);})();<\/script>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">What you can do with the toolbox<\/h2>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fish weight calculator<\/strong> \u2014 estimate a fish&#8217;s weight from its length and girth, with species-specific accuracy for bass, trout, walleye, pike, catfish and panfish.<\/li>\n<li><strong>Reel line capacity<\/strong> \u2014 see how much braid or mono fits on a reel rated for a different line diameter, so you spool the right amount.<\/li>\n<li><strong>Drag setting<\/strong> \u2014 get the recommended drag range for your line&#8217;s pound-test so you don&#8217;t snap off or miss hooksets.<\/li>\n<li><strong>Sunrise, sunset &amp; bite windows<\/strong> \u2014 exact sun times and the prime dawn\/dusk feeding windows for your location and date.<\/li>\n<li><strong>Trolling depth<\/strong> \u2014 estimate how deep your lure runs on lead-core line using the angler&#8217;s &#8220;rule of fives.&#8221;<\/li>\n<li><strong>Water temp species guide<\/strong> \u2014 enter the current water temperature and see which species are most active right now.<\/li>\n<li><strong>Unit converters<\/strong> \u2014 quick length, weight and water-temperature conversions.<\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n<h3 class=\"wp-block-heading\">How do you estimate a fish&#8217;s weight without a scale?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Measure total length and girth (the distance around the body at its fattest point) in inches, then use Weight (lb) = (Length \u00d7 Girth\u00b2) \u00f7 800 for bass-shaped fish, or \u00f7 900 for slimmer fish like trout, walleye and pike. With an accurate girth, this is usually within 5\u201310% of the true weight.<\/p>\n\n\n<h3 class=\"wp-block-heading\">How deep does lead core line run?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">A common rule of thumb is about 5 feet of depth per color at roughly 2 mph. Trolling slower runs deeper; trolling faster runs shallower. Thinner lead core sinks more per color.<\/p>\n\n\n<h3 class=\"wp-block-heading\">What drag setting should I use?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">A good starting point is one-quarter to one-third of your line&#8217;s breaking strength. For example, 20 lb line gives a starting drag of about 5\u20136.6 lb. Set it with a scale and lighten it for light leaders or hard-fighting fish near structure.<\/p>\n\n\n<h3 class=\"wp-block-heading\">What water temperature is best for fishing?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Every species feeds best in a preferred band \u2014 for example largemouth bass around 65\u201380\u00b0F and trout around 52\u201364\u00b0F. The Water Temp guide shows which species are most active at your current water temperature.<\/p>\n\n\n<h3 class=\"wp-block-heading\">When is the best time of day to fish?<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Dawn and dusk are prime feeding windows for most species. The Sunrise\/Sunset tool gives exact sun times and the best low-light windows for your exact location and date.<\/p>\n\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@graph\":[\n{\"@type\":\"WebApplication\",\"name\":\"Fishing Toolbox\",\"url\":\"https:\/\/fishingtoolbox.com\/\",\"applicationCategory\":\"UtilitiesApplication\",\"operatingSystem\":\"Any\",\"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"USD\"},\"description\":\"Free fishing calculators: fish weight estimator, reel line capacity, drag setting, trolling depth, sunrise\/sunset bite windows, water temperature species guide, and unit converters.\"},\n{\"@type\":\"FAQPage\",\"mainEntity\":[\n{\"@type\":\"Question\",\"name\":\"How do you estimate a fish's weight without a scale?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Measure total length and girth in inches, then use Weight (lb) = (Length x Girth squared) \/ 800 for bass-shaped fish, or \/900 for slimmer fish like trout, walleye and pike. 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Everything runs right in your browser, on your phone or desktop.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-8","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Free Fishing Calculators &amp; Tools | Fishing Toolbox<\/title>\n<meta name=\"description\" content=\"Free fishing calculators: estimate fish weight, set your drag, find trolling depth, sunrise &amp; bite times, water-temp species guide and unit converters. 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