Double Recipe Calculator

Double a recipe — multiply every ingredient by 2, with notes on leavening, salt, and bake time.

Inputs

Result

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General calculation reads

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How Not to Be Wrong
Jordan Ellenberg - math thinking
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The Joy of X
Steven Strogatz - accessible math
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Scientific calculator (Casio fx-991EX)
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How to use this calculator

  • Enter the original amount.
  • Pick the unit.
  • Note the cook-time tip — volumes scale by 2 but bake time scales by ~1.1-1.15.

About this calculator

Doubling a recipe is the most common scale-up. Linear math works for almost everything except cooking time (volumes warm slower) and very small leavening doses (rounding errors compound). Plan for a slightly bigger pan or longer cook.

Frequently asked

Does doubling change the cook time?+
A bit — volumes warm slower than they cool. Add ~10-15% to baking time, more for very dense doughs (whole-grain breads).
Can I double a 2-egg recipe to 4 eggs?+
Yes — eggs scale linearly. The trickier case is 2× a 1-egg recipe, where you sometimes need to also bump leavening to keep texture.
Will my mixer handle a doubled cookie dough?+
Most stand mixers (5-6 qt) can — KitchenAid manuals list flour-weight maximums. Hand mixers struggle.
Should I halve the salt when doubling?+
No — salt scales linearly. For 3× or more, you can reduce salt by ~5% to taste.
Do I need a bigger pan?+
Probably — see pan-size-converter. Double the volume usually needs a pan with ~2× the area.

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