Is it true that 1 ml of water always equals 1 g?

Essentially yes, at typical kitchen temperatures — 1 ml of water weighs almost exactly 1 g (technically 0.998 g at room temperature, close enough to ignore for cooking). This is why metric recipes sometimes list water in grams on a scale instead of measuring it by volume.

A recipe needs 1.5 cups of water — how many grams should that be on my scale?

1.5 cups × 237 g ≈ 356 g. You can also just fill the measuring cup to the 1.5 cup line if you don't have a scale — water is one ingredient where cup measurements are reliably accurate.

Water: Cups to Grams Converter

Convert water between cups, tablespoons, teaspoons, milliliters, grams, and ounces.

Ingredient

Amount

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Water: 237 Grams

Water is the reference point for volume-to-weight conversions: 1 cup of water weighs almost exactly 237 g, and 1 ml of water weighs almost exactly 1 g. This 1:1 relationship between milliliters and grams for water is why metric recipes often treat ml and g as interchangeable for water-based liquids, even though that's not true for other ingredients.

Common Amounts

Water cups to grams
Cups	Grams
1/4 cups	59 g
1/3 cups	79 g
1/2 cups	118 g
3/4 cups	178 g
1 cup	237 g
2 cups	474 g

Frequently Asked Questions

Last reviewed: 2026-06-11 · Source: USDA FoodData Central / King Arthur Baking ingredient weight charts · see our methodology

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Water: Cups to Grams Converter

Common Amounts

Frequently Asked Questions

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