Double or Halve a Recipe
Double, halve, triple, or one-and-a-half a recipe in a single step. Type your ingredients, pick a multiplier, and every amount adjusts at once — no mental arithmetic, no half-remembered fractions. It is the quickest way to stretch a recipe to feed more people or shrink it so you are not stuck with leftovers, and it handles the awkward fractions (three-quarters of a cup doubled is one and a half cups) for you.
Calculate
Default result: 2.00
Double or Halve a Recipe · Result
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Multiplier
[{"ingredient":"Butter","amount":"1","unit":"cups"},{"ingredient":"Sugar","amount":"0.75","unit":"cups"},{"ingredient":"Eggs","amount":"2","unit":"count"}] × 2
Reviewed by the calculators.dev team · Last updated 2026-06-24
Formula reviewed against Standard culinary practice — recipe multiplier (double / halve) scaling
How to calculate
Enter each ingredient and amount, then choose a multiplier: 2 to double, 0.5 to halve, 3 to triple, or any value in between. Each ingredient is multiplied by that number. Halving 0.75 cup of sugar gives 0.375 cup — round to a measure you can actually spoon, like a generous third of a cup. For odd items such as eggs, round to whole units and adjust the liquid slightly if needed.
scaled amount = original amount × multiplier. Doubling uses ×2, halving uses ×0.5, tripling uses ×3. One cup butter × 2 = 2 cups; 0.75 cup sugar × 2 = 1.5 cups; 2 eggs × 2 = 4 eggs.
Example calculation
Doubling a recipe means multiplying every ingredient by 2. One cup of butter becomes 2 cups, three-quarters of a cup of sugar becomes 1.5 cups, and 2 eggs become 4. The multiplier is the same for every ingredient.
- factor
- 2.00
Assumptions
- Every ingredient is multiplied by the same number — fine for most home recipes, but seasonings and leavening often need a little less than the full multiple when you scale up a lot.
- Fractional results are exact; round to a practical measure yourself, especially for eggs and other countable items.
- Pan size and bake time do not follow the multiplier — a doubled batch usually needs a larger pan and a longer, but not doubled, bake.
Common mistakes
- Halving an egg literally. Beat one egg, then use about half of it, or scale the recipe to keep eggs whole.
- Doubling the leavening and salt blindly — in large batches these often taste better scaled back slightly.
- Keeping the same pan when doubling, which overfills it and changes how the food bakes.
Frequently asked questions
How do I halve a recipe with an odd number of eggs?
Beat the whole egg, then use about half by volume (roughly 1.5 tablespoons of beaten egg is half a large egg). Or scale the whole recipe up or down to keep eggs whole.
Can I triple or quadruple a recipe this way?
Yes — set the multiplier to 3 or 4. Watch the seasoning and leavening, which usually need proportionally less, and split very large batches across multiple pans.
Does doubling a recipe double the baking time?
No. A larger batch usually needs more time, but rarely twice as much. Judge doneness by color, texture, and internal temperature rather than the clock.
What multiplier halves a recipe?
Use 0.5. Every ingredient is cut to half its original amount — round the fractions to measures you can practically spoon out.