Recipe Scaling Calculator
Scale a recipe to more or fewer servings, with quantities shown as kitchen-friendly fractions and exact decimals.
Your inputs
Results
Scaling factor
1.5 ×
- First ingredient
- 3 cups flour
✓Exact calculation — rounded only for display
Notes for this result
- Baking times, pan sizes and leavening may not scale linearly; eggs are best rounded to whole numbers.
| Original | Scaled (nearest ⅛) | Exact quantity |
|---|---|---|
| 2 cups flour | 3 cups flour | 3 |
| 1 1/2 tsp baking powder | 2 1/4 tsp baking powder | 2.25 |
| 3 eggs | 4 1/2 eggs | 4.5 |
| 200 g butter | 300 g butter | 300 |
| salt to taste | salt to taste (adjust to taste) | — |
What this calculator does
Paste the ingredient list, set the original and new servings, and every leading quantity is multiplied — including mixed numbers like 1 1/2.
Formula and method
Scaled quantity = original quantity × (new servings ÷ original servings), rounded to the nearest ⅛ for display.
Worked example
Calculated by this tool with its default inputs:
Inputs
- Original servings: 4
- Servings you want: 6
- Ingredients — one per line, quantity first: 2 cups flour 1 1/2 tsp baking powder 3 eggs 200 g butter salt to taste
Results
- Scaling factor: 1.5 ×
- First ingredient: 3 cups flour
How to read the results
Ingredients without a leading number (like “salt to taste”) are left for you to adjust.
Assumptions and limitations
- Cooking times, pan sizes and leavening may need separate adjustment.
Questions
Can I halve a recipe with 3 eggs?
It shows 1 1/2 eggs; beat an egg and use half, or round sensibly.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 4 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy