Practical Guide
How to convert any American recipe from cups to grams
Many American recipes use cups. Converting to grams makes quantities easier to repeat, provided the ingredient and measuring convention match the original recipe.
2 min read
By Stefan Ulrich · Last updated
Why cups are an imprecise unit
A cup is a unit of volume, not weight. The problem is that different ingredients have completely different densities. One cup of honey weighs 340 grams. One cup of all-purpose flour weighs 120 grams. One cup of cocoa powder weighs just 85 grams. The cup is the same. The weight is completely different.
Converting fixes a chosen reference weight; it cannot reveal how much the recipe author actually put in a cup. Prefer the author’s gram quantities or their own conversion chart.
Step-by-step: how to convert a recipe
- List every ingredient with its cup measurement (including fractions like ½ cup or ¼ cup).
- Find the gram-per-cup value for each ingredient on this site — use the search bar or browse by category.
- Multiply: grams per cup × number of cups = total grams. For example, 2½ cups of flour = 2.5 × 120 = 300 grams.
- Note the result next to each ingredient in the recipe. You only need to do this once per recipe.
- Bake with a scale from now on — add each ingredient directly to the bowl, zeroing the scale between each one.
Common fractions converted
| Cup amount | Multiplier |
|---|---|
| ¼ cup | × 0.25 |
| ⅓ cup | × 0.333 |
| ½ cup | × 0.5 |
| ⅔ cup | × 0.667 |
| ¾ cup | × 0.75 |
| 1 cup | × 1 |
| 1½ cups | × 1.5 |
| 2 cups | × 2 |
What about teaspoons and tablespoons?
For a teaspoon of baking soda or half a teaspoon of salt, use level measuring spoons or a suitably sensitive scale. A scale displaying only whole grams may round away a meaningful part of the dose.
The one-time investment
Save the converted recipe with its reference values and preparation notes. If you change the brand, ingredient form or recipe, reassess those assumptions rather than treating the first conversion as permanent proof.
The takeaway
Use grams from the original recipe when available. Otherwise choose the matching ingredient form, multiply its reference weight by the cup amount and record the assumption.
Sources and ingredient references
The linked ingredient pages explain the reference weights used here, including source differences. Conversions are estimates; the original recipe’s gram quantities take priority.