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 125 g) weighs well under two-thirds of 1 cup of granulated sugar (about 200 g) and about half of 1 cup of 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
The ingredient weights are typical averages compiled from common baking references, not exact constants: real weights vary with brand, moisture, sifting and how the cup is filled, often by 10% or more. Volume units are exact (US cup = 236.5882365 mL, tbsp = cup/16, tsp = cup/48, per NIST), and the gram, ounce (28.349523125 g) and pound (453.59237 g) conversions use exact defined values. Results are rounded to the decimals shown. For baking where accuracy matters, weigh with a kitchen scale.
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 |