Cups to grams
A cup of oats is 81 g and a cup of honey is 339 g, so this asks what you are measuring before it answers. Every weight comes from USDA and carries the id you can check it against. Nothing you type here leaves your browser — it is worked out on your own device, so there is nothing to send and nothing to log.
A cup of one thing is not a cup of another
A cup is a measure of volume, and a recipe in grams wants weight. What turns one into the other is the density of the ingredient, and densities are not close together:
| One US cup of rolled oats | 81 g |
|---|---|
| One US cup of honey | 339 g |
The same cup, 4.19 times the weight. That is why a single “1 cup = 240 g” conversion is useless, and why this page asks which ingredient before it answers.
And a cup is not a cup either
There is no single cup. A recipe written in America means 236.6 ml; one written in Britain before metrication may mean the imperial cup of 284.1 ml; Australian cups are 250 ml and Japanese ones 200 ml. The same cup of flour, measured five ways:
| US cup, 236.6 ml | 125 g |
|---|---|
| US legal cup, 240 ml | 126.8 g |
| Metric cup, 250 ml | 132.1 g |
| Imperial cup, 284.1 ml | 150.1 g |
| Japanese cup, 200 ml | 105.7 g |
42.1% between the smallest and the largest, and 20% between the US cup and the imperial one — which are the two most likely to be confused, because both are written “cup” in English. The selector above defaults to the US cup, because that is the one USDA measured and the one most recipes written in cups mean.
Where these weights come from
Every weight on this page is from USDA
FoodData Central, SR Legacy — a work of the United
States government, and therefore public domain. Each ingredient
carries the fdcId of the exact food it came from, so
any number here can be checked at
fdc.nal.usda.gov against the food it claims to be.
The list is short on purpose. USDA has no cup portion for fourteen of the ingredients this page asked for — brown sugar, icing sugar, bread flour, baking powder, bicarbonate of soda, dried yeast, almonds, walnuts, desiccated coconut, raisins, grated cheddar and others. They are not on this page rather than estimated from something similar. A plausible density is indistinguishable from a measured one the moment it is written down, and this site would rather be short than be quietly wrong.
Sifted flour is a different measurement
USDA records some foods as “1 cup” and some as “1 cup, sifted”, and they are not the same number — sifting aerates flour and drops the weight of a cup by roughly a fifth. Only plain, unqualified cup portions are used here. If your recipe says sifted, measure by weight if you can.
The same goes for how you fill the cup. Scooping packs flour; spooning it in does not. USDA's figure is a measurement of a particular way of filling a particular cup, and that is the irreducible reason a kitchen scale beats a cup for anything where the proportion matters.