Free Cups to Grams Converter
Convert US cups to grams by ingredient — flour, sugar, butter, rice, oats, honey, and 25+ more baking ingredients. Free, accurate, no sign-up.
Exact Conversion Formula & Multipliers
Unlike fixed unit conversions, cups-to-grams depends on ingredient density: grams = cup volume (236.588 mL for a US cup) × the ingredient's density in grams per milliliter. That's why 1 cup of all-purpose flour (about 120 g) weighs roughly half as much as 1 cup of granulated sugar (about 200 g) or peanut butter (about 258 g) — the volume is identical, but the packed mass per milliliter is not, so a single universal 'cups to grams' multiplier does not exist.
Practical Real-World Scenarios
- Baking precision: recipes that specify weight instead of volume for flour and sugar produce more consistent results, since scooped flour can vary by up to 20% depending on how it's packed.
- Recipe conversion: converting a US-volume recipe to a European gram-based one requires knowing the specific ingredient's density, not a single flour-to-grams or sugar-to-grams shortcut.
- Dietary tracking: nutrition apps often require gram measurements for accuracy, so home cooks measuring by cup need an ingredient-specific conversion to log meals correctly.
Historical & Technical Background
The 'cups to grams' problem has no single historical origin — it's a modern friction point created by the coexistence of America's volume-based cooking tradition and the rest of the world's weight-based one. Professional culinary schools have long taught weighing over volume measurement specifically because ingredient density varies with humidity, brand, and how firmly it's packed, making a scale the only way to guarantee two bakers get the same result from the same recipe.
Precision & Accuracy Statement
Every conversion factor used on this page is checked against internationally recognized reference standards — USDA FoodData Central reference densities and NIST Handbook 44 volume standards — rather than approximated or rounded for display. Where a constant is fixed by international definition (such as 1 inch = 2.54 cm, or standard gravity = 9.80665 m/s²), we use the exact defined value. Where a figure is a practical industry convention rather than a physical constant, that distinction is stated explicitly above so results are never presented with false precision.
How This Converter Works
Cups measure volume, grams measure mass — and different ingredients have completely different densities. One cup of flour weighs 125g, but one cup of honey weighs 340g. Select your ingredient first for an accurate result.
Common Conversions
| Ingredient | 1 Cup (g) | 1 Tbsp (g) | 1 Tsp (g) |
|---|---|---|---|
| All-Purpose Flour | 125 g | 7.8 g | 2.6 g |
| White Sugar | 200 g | 12.5 g | 4.2 g |
| Butter | 227 g | 14.2 g | 4.7 g |
| White Rice (uncooked) | 185 g | 11.6 g | 3.9 g |
| Rolled Oats | 90 g | 5.6 g | 1.9 g |
| Honey | 340 g | 21.3 g | 7.1 g |
| Olive Oil | 216 g | 13.5 g | 4.5 g |
| Brown Sugar (packed) | 220 g | 13.8 g | 4.6 g |