Cooking Calculator — Scale Recipes, Convert Units, Estimate Roast Times

How to Use This Calculator

Use the tabbed form above to reach the mode you need: scale recipes by servings, convert between ingredient units, or estimate roast and rest times based on the cut, weight, and oven settings.

Recipe scaling multiplies every ingredient amount by the ratio between desired and original servings. Choose rounding and unit preferences to turn messy decimals into wizard-friendly measurements.

The ingredient converter relies on a curated density table so you can move between mass and volume reliably for the foods listed. Pick the density, enter a quantity, and the tool will convert to the unit you need.

The roast estimator uses a lightweight affine model (minutes per kilogram plus base time) with modifiers for oven type and temperature. Always check doneness with a thermometer and account for carryover cooking.

Methodology

Every calculation uses the same conservative rounding model so results stay deterministic across browsers and refreshes. Inputs are validated, and the detail table tracks exactly what gets scaled or converted so you can inspect each row before transferring numbers to your recipe sheet.

Full original guide (expanded)

q_{new} = q_{orig} × (S_{new} / S_{orig})

m = ρ · V and V = m / ρ

t = a · w + b

Recipe scaling: q_new = q_orig × (S_new / S_orig); Mass–volume conversion with density: m = ρ · V and V = m / ρ where ρ is ingredient-specific (e.g., g/mL); Roast time (affine model): t = a · w + b where t is time, w is weight, a,b depend on meat type and oven. Convection typically reduces t by ~15–20%.