Baking and cooking math, done for you
Twenty-four free calculators and reference guides for the kitchen math that actually matters — from baker's percentages to how much soup to make for a crowd.
Baking Math
Baker's Percentage Calculator
Ingredient weights from flour weight and percentages, or work backward from a target dough weight.
Recipe Scaling Calculator
Scale any ingredient amount up or down between two yields.
Hydration Percentage Calculator
Find your dough's hydration, or the water needed to hit a target.
Sourdough Starter Feeding Calculator
Exact flour and water for any starter feeding ratio.
Yeast Conversion Calculator
Convert between active dry, instant, and fresh yeast by weight.
Conversions & Substitutions
Volume to Weight Converter
Cups to grams (or back) for flour, sugar, butter, and more.
Pan Size Conversion Calculator
Adjust a recipe for a different pan, based on surface area.
Oven Temperature Conversion
Fahrenheit, Celsius, and UK gas mark, converted instantly.
Egg Size Substitution Calculator
Convert a recipe's egg count between small, medium, large, and jumbo.
Butter Substitution Calculator
Convert butter to oil, shortening, margarine, or coconut oil.
Herb Substitution Chart
Fresh to dried conversion, plus common herb-for-herb swaps.
Spice Conversion Chart
Whole to ground spice conversion, and why the ratio isn't 1:1.
Dry to Cooked Rice Calculator
Convert dry rice to cooked (or back), by rice type.
Flour Types Explained
What separates AP, bread, cake, pastry, and 00 flour — and when to use each.
Meat & Roasting
Internal Meat Temperature Guide
USDA safe minimums, plus common beef doneness temperatures.
Turkey Cooking Time Calculator
Estimated roasting time by weight, stuffed or unstuffed.
Brine Calculator
Salt (and sugar) by weight and target salinity, not guesswork.
Meat Thawing Time Estimator
Refrigerator or cold water thawing time by weight.
Vegetable Roasting Times
Typical roast times by vegetable at 400–425°F.
Serving & Meal Planning
Pasta Serving Calculator
How much dry pasta to cook for a given number of people.
Soup Serving Calculator
Batch size for a crowd, as a main course or a starter.
Chili Serving Calculator
How much chili to make, from a family dinner to a cook-off.
Leftover Calculator
Servings remaining, plus how long common leftovers stay safe.
Coffee Ratio Calculator
Coffee-to-water ratio by weight, either direction.
Appliance Conversions
Air Fryer Conversion Chart
Convert oven temperature and time to air fryer settings.
Slow Cooker Conversion Chart
Convert oven or stovetop time to slow cooker Low or High.
Dutch Oven Size Guide
Common sizes, typical diameter, and what each is good for.
Why weight-based baking math, not just recipes
Cups and tablespoons are convenient, but they're not consistent — the same "1 cup of flour" can vary by 10-20% in actual weight depending on how it's measured. Every calculator on this site that touches baking works in weight and percentages wherever it matters, the way professional bakers actually think about a formula, so the numbers hold up whether you're making one loaf or ten.
Reference numbers, not a guarantee
Every calculator here is built on standard, commonly published reference data — but your specific oven, ingredients, altitude, and equipment all introduce real variation. Use these as a solid starting point and confirm doneness (with a thermometer, a toothpick, or your own judgment) rather than trusting a number alone.