Recipe scaler
Calculator
The calculator needs JavaScript. The tables below give the same numbers for common cases.
How it is worked out
- Scale factor = wanted servings ÷ original servings = 6 ÷ 4 = 1.5.
- Quantities are rounded to the nearest eighth where that is close; baking times, pan sizes and seasoning may not scale exactly.
| Inputs | Answer |
|---|---|
| Ingredients, one per line: 2 cups flour 1 1/2 tsp baking powder 3/4 cup sugar 2 eggs 1 cup milk; Original servings: 4; Servings you want: 6 | To change 4 servings to 6, multiply every quantity by 1.5. |
| Ingredients, one per line: 1/2 cup butter 2 cups sugar 3 eggs; Original servings: 12; Servings you want: 24 | To change 12 servings to 24, multiply every quantity by 2. |
| Ingredients, one per line: 400 g pasta 2 tbsp olive oil; Original servings: 4; Servings you want: 2 | To change 4 servings to 2, multiply every quantity by 0.5. |
How to use it
Enter each ingredient on its own line starting with the quantity, like 1 1/2 tsp baking powder. The calculator multiplies every quantity by wanted servings ÷ original servings and shows the result, rounded to the nearest eighth where that is close.
Spices, leavening, pan sizes and cooking times do not always scale in a straight line, so taste and adjust when you change a recipe a lot.
Frequently asked questions
How do I scale a recipe?
Divide the servings you want by the servings in the recipe and multiply each quantity by that.
Do baking times scale?
Not directly; a larger pan or batch may need a different time.
How do I double a recipe?
Set the wanted servings to twice the original.
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
About · How we verify this · Editorial policy · Corrections
General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.