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CalcWolf Food Recipe Serving Converter
Food

Scale Any Recipe Up or Down

Convert recipe servings from any amount to any amount. Doubles, halves, or any custom multiplier.

📅 Updated April 2026 Formula verified 📖 4 min read 🆓 Free · No sign-up

How to Scale Recipes

Multiply every ingredient by the scale factor (desired servings ÷ original servings). Recipe for 4, want 10: multiply everything by 2.5. One cup becomes 2.5 cups. Two eggs become 5 eggs. Simple math, but the tricky part: not everything scales linearly. Seasonings, leavening agents, and cooking times need adjustment.

What Does NOT Scale Linearly

Spices and salt: Scale to 1.5x when doubling, then adjust to taste. Spices intensify disproportionately. Baking powder/soda: Use 75-80% of proportional amount when scaling up. Too much leavening makes baked goods collapse. Cooking time: Larger batches may need longer cooking but NOT proportionally longer. A doubled cake recipe in a larger pan may need only 10-15 more minutes, not double the time. Eggs: When halving, beat one egg and measure half by volume.

⚡ CalcWolf Insight

Professional chefs scale by weight (grams), not volume (cups). A cup of flour can vary 20-30% depending on how it is scooped. If you do any serious cooking or baking, a $15 kitchen scale is the single best upgrade — it makes scaling recipes foolproof and improves consistency dramatically.

Frequently asked questions
How do I double a recipe?
Multiply every ingredient by 2. But for seasonings and spices, start at 1.5x and adjust. For baking, use 1.75x baking powder/soda. Cooking time increases slightly (10-20%) but does not double. Use a larger pan or multiple pans to avoid overcrowding.
How do I halve a recipe with 3 eggs?
Use 1.5 eggs: crack 2 eggs into a bowl, beat well, measure out 3/4 of the mixture (approximately 75ml or 5 tablespoons). This is more accurate than trying to halve a single egg.
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
Founder, CalcWolf · GLVTS · Blickr
All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →
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