kitchen maths

Cooking calculators

Recipe scaling, unit conversion and cooking calculations — cups to grams, oven temperatures, roasting times and brew ratios.
18
calculators
cups
↔ grams
free
no signup
Page 1 — kitchen maths
Recipe scaler
Resize a recipe from any serving count to any other.
Cooking unit converter
Volume ↔ weight conversion that knows your ingredient's density.
Oven temperature converter
Every oven scale at once — including the fan adjustment.
Baking substitution calculator
The standard swap and exact amounts for what you're missing.
Yeast converter
Swap between the three yeast types without killing your dough.
Butter to oil converter
How much oil replaces the butter in your recipe — or the reverse.
Cooking time calculator
Minutes-per-kilo roasting times plus the safe internal temperature.
Portion size calculator
Per-person and total quantities for feeding any group.
Coffee ratio calculator
Exact coffee and water weights for your brew method.
cooking — page 2: nutrition
9 more calculators →

Kitchen maths, solved

Half a recipe that serves six, a US recipe in cups when your scale reads grams, a fan oven when the book assumes conventional — most kitchen frustration is unit maths. These nine calculators handle the conversions cooks actually hit: scaling, volume-to-weight by ingredient, oven temperatures with fan adjustment, yeast types and butter-to-oil swaps.

Why cups-to-grams needs the ingredient

A cup is a volume; a gram is a weight. The conversion depends entirely on density — a cup of flour weighs about 125 g while a cup of sugar weighs 200 g. Our cooking converter builds in densities for the common baking ingredients so the answer is right for what you're actually measuring, not just for water.

Roasting by weight, not guesswork

The cooking time calculator uses the classic minutes-per-kilogram method by meat and doneness, plus the safe internal temperatures to confirm with a thermometer. Time formulas get you close; the thermometer makes it safe — especially for poultry and pork.

From kitchen to nutrition

Page two of the cooking category moves from making food to measuring it: calories, macros, sugar and sodium against WHO guidance. The two pages cross-link, and both pair naturally with the TDEE and calorie deficit calculators in our health category.