Scale a recipe when the number of servings changes. Enter the original servings and the servings you want, then list each ingredient as a decimal amount and the unit you already use. The scale factor is desired servings divided by original servings. Each amount is multiplied by that exact factor and then rounded half-up to two decimals on its own. Units are not converted: a tablespoon stays a tablespoon. This is a kitchen multiplier, not nutrition or diet advice.
Scale a recipe when the number of servings changes. Enter the original servings and the servings you want, then list each ingredient as a decimal amount and the unit you already use. The scale factor is desired servings divided by original servings. Each amount is multiplied by that exact factor and then rounded half-up to two decimals on its own. Units are not converted: a tablespoon stays a tablespoon. This is a kitchen multiplier, not nutrition or diet advice.
A recipe written for 3 servings, scaled to 4. The exact factor is 4 ÷ 3 = 1.333…, which displays as 1.33. One cup times that exact factor is 1.333…, which displays as 1.33 cup. Two tablespoons times the same exact factor is 2.666…, which displays as 2.67 tbsp. That is not 1.33 × 2 = 2.66. Units are not converted: tbsp stays tbsp.
exact factor = desired servings ÷ original servings. Displayed factor = round2(exact factor). Each scaled amount = round2(amount × exact factor), independently. The unit label is copied unchanged. round2 is half-up to 2 decimals, the same helper as concrete round2 and discount roundMoney. Do not multiply by the rounded factor.
Estimates are for planning materials only. Check the paint label for actual coverage and buy enough for touch-ups.
The scale factor is desired servings divided by original servings. If a recipe serves 4 and you want 8, the factor is 8 ÷ 4 = 2, which displays as 2.00. If it serves 4 and you want 6, the factor is 6 ÷ 4 = 1.5, which displays as 1.50. Both serving counts have to be greater than 0. Zero, a blank box, a negative number, or text is rejected instead of inventing a factor.
No. Units are not converted. You type an amount and a unit label, and the label is copied onto the scaled amount unchanged. One cup stays one cup, scaled. One tablespoon stays a tablespoon. The page will not turn tbsp into tsp, or cups into grams. If you need a different unit, convert it yourself before you type the amount. Decimals are the input. A fraction such as 1/2 is not read; type 0.5.
Each displayed figure is rounded on its own from the exact factor, half-up to two decimal places. Going from 3 servings to 4, the exact factor is 4 ÷ 3 = 1.333…, which displays as 1.33. An amount of 1 times that exact factor is also 1.333…, which displays as 1.33. An amount of 2 times the same exact factor is 2.666…, which displays as 2.67. Multiplying the already-rounded factor 1.33 by 2 would say 2.66, and that is not what this page does. The rounded factor is never fed into the next amount.
Yes. Scaling down uses the same factor, desired servings divided by original servings, which is less than 1 when you want fewer servings. From 8 servings to 2, the factor is 2 ÷ 8 = 0.25, which displays as 0.25, and an amount of 4 becomes 1.00. From 3 servings to 2, the exact factor is 2 ÷ 3 = 0.666…, which displays as 0.67. An amount of 10 times that exact factor is 6.666…, which displays as 6.67. It is not 0.67 × 10 = 6.70.
No. This is a kitchen multiplier for ingredient amounts when the number of servings changes. It is not nutrition or diet advice. It does not estimate calories, macros, pan sizes, oven temperatures, or cost, and it does not tell you whether a recipe is suitable for any diet.