Recipe Scaling and Serving Size Calculator
Scales every ingredient in a recipe by one factor, set either by servings or by how much of one ingredient you have.
Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
The formula
factor = servings wanted ÷ servings in the recipe or factor = amount you have ÷ amount in the recipe new amount = old amount × factor
Every ingredient is multiplied by the same factor, which keeps the proportions unchanged.
What to watch out for
To feed a different number of people, enter the servings. If you have only so much of one ingredient, enter that amount and the amount the recipe calls for, and the rest follows.
A part of an egg is easiest done by beating the egg and measuring out the share you need by weight or volume.
Frequently Asked Questions
How do I change a recipe from 4 to 6 servings?
Multiply everything by 1.5. So 500 g of flour becomes 750 g.
I only have 150 g of butter and the recipe needs 200 g. How much of everything else?
Make 0.75 of the recipe: multiply every other ingredient by that figure.
Do I change the cooking time when doubling a recipe?
Keep the temperature and check for doneness from the original time onwards. Two tins of the same size take about the same time; one deeper tin takes longer.