Recipe Scaler
Scale a whole ingredient list up or down for any number of servings, with cook-friendly fractions.
- Scale factor
- —
- Servings
- —
- Amounts scaled
- 0
Scaled recipe
Paste your ingredient list above — the scaled amounts appear here as you type.
How it works
Paste an ingredient list, tell the recipe scaler how many servings the recipe makes and how many you actually need, and every amount is multiplied by the scale factor (new servings ÷ original servings). The parser understands whole numbers, decimals, plain fractions like 1/2, mixed numbers like 1 1/2, unicode fractions like ½ and ranges such as 1-2 tbsp — the rest of each line, including the unit and the ingredient name, is left exactly as you wrote it.
Results are shown as cook-friendly fractions rounded to halves, thirds, quarters, eighths or sixteenths, so you get "3/4 cup" instead of "0.75 cup"; switch to decimals if you measure by scale. Amounts that do not land near a tidy fraction fall back to two decimals. Everything runs in your browser with plain JavaScript — no upload, no sign-up and no ads, so your family recipes stay on your device. Remember that oven temperatures stay the same when you scale, pan size and baking time do not, and strong flavourings such as salt, spices and yeast are usually best scaled a little conservatively.
Frequently asked questions
How do I scale a recipe for more servings?
Divide the servings you want by the servings the recipe makes — that is your scale factor — then multiply every ingredient amount by it. For 6 portions from a recipe that serves 4 the factor is 1.5, so 2 cups of flour becomes 3 cups. Paste the whole ingredient list into the scaler and it does the arithmetic for every line at once, leaving the units and ingredient names exactly as you wrote them.
How do I halve a recipe with fractions like 3/4 cup?
Halving 3/4 cup gives 3/8 cup, which is 6 tablespoons. The scaler handles plain fractions (1/2), mixed numbers (1 1/2), unicode fractions (½) and ranges (1-2 tbsp), and rounds results to the nearest usable kitchen fraction — halves, thirds, quarters, eighths or sixteenths — instead of showing 0.375. Switch to decimal mode if you measure with a scale.
Do baking time and oven temperature change when you double a recipe?
The oven temperature stays the same; the time usually does not. A doubled batch spread over a larger pan bakes in roughly the same time, while the same batter in a deeper pan needs longer — start checking about 10 minutes before the original time. Salt, spices, yeast and leavening are also worth scaling slightly conservatively and then tasting.