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Original servings, desired servings, and ingredient quantities.
Quick math
Recipe scaler
Adjust a whole ingredient list with one consistent multiplier.
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Scale factor: 1.5×
QuantityUnitIngredient
Scaled recipe
Quantities accept decimals and fractions such as 3/4 or 1 1/2.
3cups flour
2.25cups milk
3 eggs
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What does recipe scaler do?
The recipe scaler multiplies every recognized ingredient quantity by target servings ÷ original servings. It accepts decimals, simple fractions such as 3/4, and mixed numbers such as 1 1/2.
- Input
- Original servings, desired servings, and ingredient quantities.
- Result
- A proportionally scaled ingredient list.
- Price
- Free
- Account
- Not required
How to use recipe scaler
Choose your settings
Adjust a whole ingredient list with one consistent multiplier.
Save or copy
A proportionally scaled ingredient list.
A practical tip
Seasonings and cooking times may not scale linearly, so taste and monitor as you cook.
When to use recipe scaler
Increase a four-serving dinner recipe to feed six people.
Reduce a twelve-cookie test batch to three cookies before committing ingredients.
Scale a catering ingredient list to a revised guest count while retaining its units.
Worked example
A concrete recipe scaler example
- Input
- 2 cups flour 1 1/2 cups milk 2 eggs
- Settings
- Original servings: 4; target servings: 6
- Result
- 3 cups flour 2.25 cups milk 3 eggs Scale factor: 1.5×.
What to expect
How it works
A scale factor is calculated from the two positive serving counts. Each row's quantity is parsed as a decimal, fraction, or mixed number, multiplied by that factor, and displayed with up to three decimal places; its unit and ingredient name remain unchanged.
Know before using
Limits and edge cases
- The quantity parser does not understand Unicode fraction symbols, ranges such as 2–3, or descriptive amounts such as “to taste.” Unrecognized rows show a question mark.
- Scaling changes quantities only; it does not convert units or adjust pan size, oven temperature, proofing time, or cooking time.
Common questions
Recipe scaler FAQ
Is recipe scaler free to use?
Yes. Recipe scaler is free to use.
Does recipe scaler keep my work private?
Yes. Your work stays private while you use the tool — nothing you enter is uploaded.
How is the scale factor calculated?
It is target servings divided by original servings. Going from 4 to 6 servings gives 6 ÷ 4 = 1.5, so each recognized quantity is multiplied by 1.5.
Can I enter mixed fractions?
Yes. Enter a whole number, a space, and a fraction, such as “1 1/2.” Plain fractions such as “3/4” also work.