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.calculator-fermentation-schedule{max-width:560px;margin:0 auto;padding:22px;background:#faf7f0;border:1px solid #e4dcc8;border-radius:10px}.calculator-fermentation-schedule label{display:block;font-weight:600;margin:12px 0 4px}.calculator-fermentation-schedule input,.calculator-fermentation-schedule select{width:100%;padding:10px;border:1px solid #ccc;border-radius:6px;font-size:16px}.calculator-fermentation-schedule button{margin-top:16px;width:100%;padding:12px;background:#d4a843;color:#1a1a1a;font-weight:700;border:0;border-radius:6px;cursor:pointer}.calculator-fermentation-schedule .result{margin-top:18px;padding:14px;background:#fff;border-radius:6px;font-size:20px;font-weight:700;color:#b5832a;text-align:center;min-height:24px}
Ale
Lager
Enter values above
(function(){
const ogInput = document.getElementById(‘calculator-fermentation-schedule-og’);
const fgInput = document.getElementById(‘calculator-fermentation-schedule-fg’);
const tempInput = document.getElementById(‘calculator-fermentation-schedule-temp’);
const yeastSelect = document.getElementById(‘calculator-fermentation-schedule-yeast’);
const resultDiv = document.getElementById(‘calculator-fermentation-schedule-out’);
const calculateButton = document.getElementById(‘calculator-fermentation-schedule-btn’);function calculateFermentationSchedule() {
const og = parseFloat(ogInput.value);
const fg = parseFloat(fgInput.value);
const temp = parseFloat(tempInput.value);
const yeast = yeastSelect.value;if (isNaN(og) || isNaN(fg) || isNaN(temp)) {
resultDiv.textContent = ‘Please enter valid numbers’;
return;
}const abv = (og – fg) * 131.25;
let fermentationDays;
if (yeast === ‘ale’) {
fermentationDays = Math.max(7, Math.min(14, (og – fg) * 2 + 7));
} else if (yeast === ‘lager’) {
fermentationDays = Math.max(14, Math.min(28, (og – fg) * 3 + 14));
}const message = `Fermentation Schedule: ${fermentationDays} days, ABV: ${abv.toFixed(2)}%`;
resultDiv.textContent = message;
}calculateButton.addEventListener(‘click’, calculateFermentationSchedule);
ogInput.addEventListener(‘input’, calculateFermentationSchedule);
fgInput.addEventListener(‘input’, calculateFermentationSchedule);
tempInput.addEventListener(‘input’, calculateFermentationSchedule);
yeastSelect.addEventListener(‘change’, calculateFermentationSchedule);
})();How It Works
The fermentation schedule predictor uses the original gravity (OG), final gravity (FG), fermentation temperature, and yeast type to estimate the fermentation time and calculate the alcohol by volume (ABV). The ABV is calculated using the formula: ABV = (OG – FG) * 131.25. The fermentation time is estimated based on the yeast type and the difference between the OG and FG.
How to Use
- Enter the original gravity (OG) of your beer
- Enter the final gravity (FG) of your beer
- Enter the fermentation temperature in °F
- Select the yeast type (ale or lager)
- Click the “Calculate” button or press enter to calculate the fermentation schedule
Common Questions
What is the difference between ale and lager yeast?
Ale yeast ferments at warmer temperatures (usually between 65°F and 75°F) and produces fruitier, more estery flavors. Lager yeast ferments at cooler temperatures (usually between 45°F and 55°F) and produces cleaner, crisper flavors.
