Disinfectant Dilution Ratio Calculator
ANA›Life Services Authority›National Calculator Authority›Disinfectant Dilution Ratio Calculator
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Disinfectant Dilution Ratio Calculator
Calculate how much concentrated disinfectant and water to mix to achieve your desired working concentration.
Stock Concentration (%) e.g. 5 for 5% bleach
Target Working Concentration (%) e.g. 0.1 for 1000 ppm
Final Volume Needed (mL) Total solution you want to prepare
Calculate
function disCalc() { const resultDiv = document.getElementById('dis-result'); resultDiv.style.display = 'block';
const stockConc = parseFloat(document.getElementById('dis-stock-conc').value); const targetConc = parseFloat(document.getElementById('dis-target-conc').value); const finalVol = parseFloat(document.getElementById('dis-final-vol').value);
// --- Validation --- if (isNaN(stockConc) || isNaN(targetConc) || isNaN(finalVol)) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = '⚠ Please fill in all three fields.'; return; } if (stockConc 100) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = '⚠ Stock concentration must be between 0.001% and 100%.'; return; } if (targetConc 100) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = '⚠ Target concentration must be between 0.0001% and 100%.'; return; } if (finalVol = stockConc) { resultDiv.className = 'calc-result calc-error'; resultDiv.innerHTML = '⚠ Target concentration must be less than the stock concentration. You cannot dilute to a higher concentration.'; return; }
// --- Core Formula: C1V1 = C2V2 → V1 = (C2 × V2) / C1 --- const disinfectantVol = (targetConc * finalVol) / stockConc; // mL of concentrate const waterVol = finalVol - disinfectantVol; // mL of water
// Dilution ratio (parts water : 1 part concentrate) const dilutionRatio = waterVol / disinfectantVol;
// Parts per million of active ingredient (assuming water-based, density ≈ 1 g/mL) const ppm = targetConc * 10000;
// Ratio string e.g. 1:49 const ratioConc = 1; const ratioWater = Math.round(dilutionRatio);
resultDiv.className = 'calc-result calc-success'; resultDiv.innerHTML = '### Results ' + '' + 'Disinfectant (concentrate) to add:' + '' + disinfectantVol.toFixed(2) + ' mL' + 'Water to add:' + '' + waterVol.toFixed(2) + ' mL' + 'Final volume:' + '' + finalVol.toFixed(0) + ' mL' + 'Dilution ratio (concentrate : water):' + '1 : ' + dilutionRatio.toFixed(1) + '' + 'Working concentration:' + '' + targetConc + '% (' + ppm.toFixed(0) + ' ppm)' + '' + '📌 Mix ' + disinfectantVol.toFixed(2) + ' mL of your ' + stockConc + '% stock solution with ' + waterVol.toFixed(2) + ' mL of water to obtain ' + finalVol + ' mL of a ' + targetConc + '% (' + ppm.toFixed(0) + ' ppm) working solution.
'; }
#### Formula
Uses the dilution equation C₁V₁ = C₂V₂:
- V₁ = (C₂ × V₂) / C₁
- Vwater = V₂ − V₁
Where:
- C₁ = stock (concentrate) concentration (%)
- C₂ = desired working concentration (%)
- V₁ = volume of concentrate required (mL)
- V₂ = total final volume required (mL)
Parts per million (ppm) conversion: ppm = % × 10,000
#### Assumptions & References
- Always add disinfectant to water (not water to disinfectant) to minimise splashing of concentrate.
- Reference: WHO (2020) Cleaning and disinfection of environmental surfaces in the context of COVID-19; CDC Guidelines for Disinfection and Sterilization in Healthcare Facilities.
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