Pesticide Dilution Calculator
ANA›Life Services Authority›National Calculator Authority›Pesticide Dilution Calculator
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Pesticide Dilution Calculator
Calculate how much pesticide concentrate and water you need to prepare a diluted spray solution based on the desired concentration or dilution ratio.
Total Solution Volume Needed
Litres (L) mL Gallons Quarts
Specify Dilution By
Dilution Ratio (e.g. 1:100) Target Concentration (%) Target Concentration (ppm)
Dilution Ratio (1 : X)
Enter X — the number of parts water per 1 part concentrate.
Target Concentration (%)
Percentage of concentrate in the final solution.
Target Concentration (ppm)
Parts per million of active ingredient in the final solution.
Stock Solution Concentration (%)
Required when using ppm mode — the concentration of your concentrate product.
Calculate
function pesModeSwitch() { var mode = document.getElementById('pes-input-mode').value; document.getElementById('pes-ratio-group').style.display = (mode === 'ratio') ? '' : 'none'; document.getElementById('pes-percent-group').style.display = (mode === 'percent') ? '' : 'none'; document.getElementById('pes-ppm-group').style.display = (mode === 'ppm') ? '' : 'none'; document.getElementById('pes-stock-group').style.display = (mode === 'ppm') ? '' : 'none'; document.getElementById('pes-result').style.display = 'none'; }
function pesConvertToLitres(value, unit) { if (unit === 'L') return value; if (unit === 'mL') return value / 1000; if (unit === 'gal') return value * 3.78541; if (unit === 'qt') return value * 0.946353; return value; }
function pesFormatVolume(litres, unit) { if (unit === 'L') return (litres).toFixed(4) + ' L'; if (unit === 'mL') return (litres * 1000).toFixed(2) + ' mL'; if (unit === 'gal') return (litres / 3.78541).toFixed(4) + ' gal'; if (unit === 'qt') return (litres / 0.946353).toFixed(4) + ' qt'; return litres.toFixed(4) + ' L'; }
function pesCalc() { var resultDiv = document.getElementById('pes-result'); resultDiv.style.display = 'none';
var totalRaw = parseFloat(document.getElementById('pes-total-volume').value); var unit = document.getElementById('pes-volume-unit').value; var mode = document.getElementById('pes-input-mode').value;
if (isNaN(totalRaw) || totalRaw ⚠ Please enter a valid total solution volume greater than 0.'; resultDiv.style.display = 'block'; return; }
var totalL = pesConvertToLitres(totalRaw, unit); var concentrateL, waterL, fractionUsed;
if (mode === 'ratio') { var ratio = parseFloat(document.getElementById('pes-ratio').value); if (isNaN(ratio) || ratio ⚠ Please enter a valid dilution ratio (X ≥ 1).'; resultDiv.style.display = 'block'; return; } // 1 part concentrate : ratio parts water // concentrate = totalVolume / (ratio + 1) fractionUsed = 1 / (ratio + 1); concentrateL = totalL * fractionUsed; waterL = totalL - concentrateL;
} else if (mode === 'percent') { var pct = parseFloat(document.getElementById('pes-percent').value); if (isNaN(pct) || pct 100) { resultDiv.innerHTML = '⚠ Please enter a valid concentration between 0 and 100%.'; resultDiv.style.display = 'block'; return; } // concentrate = (pct / 100) * totalVolume fractionUsed = pct / 100; concentrateL = totalL * fractionUsed; waterL = totalL - concentrateL;
} else if (mode === 'ppm') { var ppm = parseFloat(document.getElementById('pes-ppm').value); var stockPct = parseFloat(document.getElementById('pes-stock-conc').value); if (isNaN(ppm) || ppm ⚠ Please enter a valid target concentration in ppm.'; resultDiv.style.display = 'block'; return; } if (isNaN(stockPct) || stockPct 100) { resultDiv.innerHTML = '⚠ Please enter a valid stock solution concentration (0–100%).'; resultDiv.style.display = 'block'; return; } // ppm = (concentrate_volume / total_volume) * stock_fraction * 1,000,000 // concentrate_volume = (ppm * total_volume) / (stock_fraction * 1,000,000) var stockFraction = stockPct / 100; fractionUsed = ppm / (stockFraction * 1e6); if (fractionUsed >= 1) { resultDiv.innerHTML = '⚠ The required concentration exceeds what is achievable with the given stock solution. Reduce target ppm or increase stock concentration.'; resultDiv.style.display = 'block'; return; } concentrateL = totalL * fractionUsed; waterL = totalL - concentrateL; }
var concFormatted = pesFormatVolume(concentrateL, unit); var waterFormatted = pesFormatVolume(waterL, unit); var pctDisplay = (fractionUsed * 100).toFixed(4); var ppmDisplay = (fractionUsed * 1e6).toFixed(2); var ratioDisplay = fractionUsed > 0 ? '1 : ' + (1 / fractionUsed - 1).toFixed(1) : 'N/A';
var html = '### Results '; html += ''; html += 'ParameterValue'; html += 'Total Solution Volume' + pesFormatVolume(totalL, unit) + ''; html += 'Concentrate Required' + concFormatted + ''; html += 'Water Required' + waterFormatted + ''; html += 'Effective Concentration' + pctDisplay + '%'; html += 'Effective Concentration (ppm)' + ppmDisplay + ' ppm'; html += 'Dilution Ratio' + ratioDisplay + ''; html += ''; html += '⚠ Always add concentrate to water (not water to concentrate) and mix thoroughly before use. Wear appropriate PPE.
';
resultDiv.innerHTML = html; resultDiv.style.display = 'block'; }
#### Formulas Used
Dilution Ratio Mode (1 : X)
Concentrate Volume = Total Volume × 1 / (X + 1)
Water Volume = Total Volume − Concentrate Volume
Percentage Mode
Concentrate Volume = Total Volume × (Target% / 100)
Water Volume = Total Volume − Concentrate Volume
PPM Mode
Concentrate Volume = (Target ppm × Total Volume) / (Stock Concentration% / 100 × 1,000,000)
Water Volume = Total Volume − Concentrate Volume
Concentration Conversions
ppm = (Concentrate Volume / Total Volume) × Stock Fraction × 1,000,000
% = (Concentrate Volume / Total Volume) × 100
#### Assumptions & References
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