Plain water, the reference liquid most density comparisons are measured against. One US cup weighs about 237g — about 1.9× heavier than a cup of all-purpose flour.
Pure water is preselected below — just enter an amount.
The most commonly searched gram amounts, converted to cups automatically.
| Grams | Cups |
|---|---|
| 25g | 0.11 cups |
| 50g | 0.21 cups≈ ¼ cup |
| 75g | 0.32 cups≈ ⅓ cup |
| 100g | 0.42 cups≈ ½ cup |
| 125g | 0.53 cups≈ ½ cup |
| 150g | 0.63 cups≈ ⅔ cup |
| 200g | 0.84 cups |
| 250g | 1.05 cups≈ 1 cup |
| 300g | 1.27 cups≈ 1 ¼ cups |
| 500g | 2.11 cups |
| 1000g | 4.22 cups≈ 4 ¼ cups |
Plain water, the reference liquid most density comparisons are measured against.
Pure water belongs to the Liquids group on GramToCup, alongside other ingredients measured the same way in most kitchens. It shows up most often in bread dough hydration, diluting batters, steaming & boiling. Its density of 237g per US cup is what this calculator uses to convert between grams and cups automatically — no manual lookup required.
Pure water is a thin liquid with essentially no trapped air, so its weight per cup tracks closely with its actual density rather than varying with how it's handled.
A cup of pure water is about 1.9× heavier than a cup of all-purpose flour (125g/cup), even though both fill the same 1-cup measuring cup.
Common mistake: Measuring in a dry measuring cup and checking the level from above instead of at eye height, which is easy to misjudge.
Use a liquid measuring cup — the kind with a spout and a pour line — rather than a dry measuring cup, and check the level at eye height for pure water.
When a recipe needs to be exact, weigh it on a kitchen scale instead of using a measuring cup at all — it removes packing and settling from the equation entirely.
Measure pure water on a flat surface and check the line at eye level; tilting the cup to read it from above is a common source of error.
100g of pure water is approximately 0.42 cups, based on a density of 237g per US cup.
1 US cup of pure water weighs about 237g. Use the calculator above to convert any other amount instantly.
No — the calculator above converts pure water between grams and cups without a scale. A scale is only more accurate when a recipe already lists grams and you want to skip the volume measurement entirely.
Because cups measure volume and grams measure weight. A cup of pure water is about 1.9× heavier than a cup of all-purpose flour (125g/cup) because the two ingredients have different densities — see the density explanation above for why.
Use a liquid measuring cup — the kind with a spout and a pour line — rather than a dry measuring cup, and check the level at eye height for pure water.
They're in the same category, but check the density first: Cocoa powder weighs 86g per cup versus 237g for pure water. Substituting by weight (grams) keeps a recipe accurate; substituting cup-for-cup can change the result if the densities differ much.