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Culinary Mathematics Calculator

Scale recipes to any serving size, convert cooking units by weight or volume, calculate baker's percentages, and estimate nutrition — all in one kitchen math tool.

Original servings

Target servings

→ 3 cup

→ 1.5 cup

→ 0.75 cup

→ 3 unit

Scale factor: 1.5×

About the Culinary Mathematics Calculator

This free recipe scaling and kitchen math calculator bundles four tools professional and home cooks need most: a recipe converter for servings, a cooking measurement converter that bridges volume and weight using real ingredient densities, a baker's percentage calculator for precise dough formulas, and a recipe nutrition calculator using USDA FoodData Central values. Whether you're asking "how do I double a recipe", "how many grams in a cup of flour", or building a bread formula with baker's percentages, this tool runs the math instantly in your browser.

Why cup-to-gram conversion needs ingredient density

A cup of flour and a cup of honey occupy the same volume but weigh very different amounts — flour is light and airy (~125g/cup), honey is dense (~336g/cup). This calculator uses USDA National Nutrient Database bulk-density reference values (grams per milliliter) for 15 common baking ingredients to convert accurately between volume units (cups, tablespoons, teaspoons, mL, L) and weight units (grams, kilograms, ounces, pounds) — not a generic 1:1 assumption that many simple converters use incorrectly.

What is baker's percentage?

Baker's percentage (also called "baker's math") expresses every ingredient in a bread or pastry formula as a percentage of total flour weight — flour is always 100%. A formula with 350g water against 500g flour has 70% hydration. This notation lets bakers scale a formula to any batch size while preserving the exact ratio, and is the standard documentation method taught in professional baking programs (King Arthur Baking Company, culinary school curricula worldwide).

Note on scaling accuracy: Recipe scaling is linear for most ingredients, but leavening agents (baking soda, baking powder, yeast) and salt don't always scale 1:1 at extreme scale factors (4x+) — professional bakers reduce these slightly to avoid off-flavors or over-leavening. Nutrition values are per-ingredient averages from USDA data and will vary by brand and preparation method.

Frequently Asked Questions

How many grams are in a cup of flour?▼

One cup of spooned (not packed) all-purpose flour weighs approximately 125g, based on a density of 0.529 g/mL. This varies by flour type (bread flour is denser at ~136g/cup) and measuring technique — scooping directly from the bag packs flour tighter and can weigh 15-20% more than spooning it in.

What is a good hydration percentage for bread dough?▼

Standard sandwich bread runs 60-65% hydration, rustic artisan loaves and ciabatta run 70-85%, and very wet doughs like focaccia can reach 90%+. Higher hydration produces a more open, irregular crumb and chewier crust but is harder to shape by hand.

Can I always convert cups to grams the same way?▼

No — this is the most common kitchen math mistake. A cup of a dense ingredient like honey (336g) weighs nearly three times as much as a cup of a light ingredient like rolled oats (80g). Always use ingredient-specific density, which is why this calculator lets you pick the ingredient before converting.

Should I scale leavening agents (baking soda, yeast) the same as other ingredients?▼

For modest scaling (up to 2-3x), linear scaling works fine. Beyond 4x, many bakers reduce leavening and salt by roughly 10-15% relative to a strict linear scale-up, since flavor and rise don't always scale proportionally with batch size.

Where does the nutrition data come from?▼

Per-100g macro values (calories, protein, carbs, fat) are drawn from USDA FoodData Central, the U.S. government's public nutrient database. Actual nutrition varies by specific product, brand, and preparation method, so treat results as a solid estimate rather than a lab-verified label.

Sources & References

USDA FoodData Central — nutrient values per 100g for common ingredients. U.S. Department of Agriculture.
USDA National Nutrient Database — bulk-density (g/mL) reference tables for baking ingredients.
King Arthur Baking Company. “Understanding Baker's Percentage.” King Arthur Baking School resources.
NIST Handbook 44 — U.S. customary volume and weight conversion factors.