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How to Convert Cooking Measurements

Cups to grams, tablespoons to milliliters, Fahrenheit to Celsius — a practical guide to converting recipe measurements without ruining dinner.

5 min read

Recipes come in mismatched units — American cups, metric grams, gas marks. Knowing a handful of conversions (and when weight matters) keeps any recipe usable.

Volume basics

  • 1 tablespoon = 3 teaspoons ≈ 15 ml.
  • 1 cup = 16 tablespoons ≈ 240 ml.
  • 1 fluid ounce ≈ 30 ml.

Why weight beats volume

A “cup of flour” can vary 20%+ depending on how it's scooped — which wrecks baking. Where a recipe gives grams, use a scale; it's the most reliable way to get consistent results, and it makes scaling a recipe exact.

Oven temperatures

  • To convert °F to °C: subtract 32, then multiply by 5/9.
  • Common: 350°F ≈ 175°C, 400°F ≈ 200°C, 425°F ≈ 220°C.
  • Fan/convection ovens usually run ~20°C (25°F) hotter — drop the dial accordingly.

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Ingredient weights differ — a cup of flour and a cup of sugar aren't the same grams. When a baking recipe gives weights, always prefer them over cups.

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Frequently asked questions

How many grams are in a cup?
It depends on the ingredient — a cup of water is about 240 g, but a cup of flour is roughly 120–130 g and sugar about 200 g. That's exactly why weighing is more reliable than measuring by volume, especially for baking.
How do I convert Fahrenheit to Celsius for the oven?
Subtract 32 and multiply by 5/9. For quick reference, 350°F ≈ 175°C, 400°F ≈ 200°C, and 425°F ≈ 220°C. Reduce by about 20°C for a fan/convection oven.

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