1 cup of water in grams — 237 g.

Why 237 g per cup

Water is the reference: 1 ml = 1 g exactly at 4 °C; at typical room temperature 1 cup (236.588 ml) is about 236 g, often rounded to 237 g. Water is almost always measured by volume in cooking, so this conversion is mostly a sanity check.

Water and water-based liquids weigh roughly 1 g per ml, so 1 cup ≈ 237 g. The conversion is rarely useful in baking — water is almost always measured by volume — but it's the reference point all the other liquid densities (milk, cream, syrup) are anchored to.

The most accurate way to measure water

For recipes where the outcome matters — bakes, doughs, anything leavened — measure water on a kitchen scale set to grams. Set the bowl on the scale, press tare to zero, then add until the readout matches the gram value the recipe calls for. This removes the largest source of cup-to-cup variation: how you scoop.

The cup-based numbers on this page assume the “spoon and level” method — fluffing the ingredient in its container, spooning it into the cup, and levelling the top with a straight edge. Scooping directly with the cup packs more in, and can push the gram value up by 20-30 % for fluffy ingredients like flour and cocoa.