Ingredient Weight to Volume Calculator

Why Cups and Grams Are Not Interchangeable

A US recipe that calls for "1 cup flour" and "1 cup sugar" asks for two very different weights. One cup of all-purpose flour weighs about 120 g (4.2 oz), while one cup of granulated sugar weighs about 198–200 g (7.0 oz)[king-arthur-weight-chart]. If you swap the numbers — 200 g of flour where 120 g was intended — the dough is 67% heavier and the bread will be dense. The confusion is not a rounding error; it is density.

The cup itself is not universal either. The US customary cup is 236.588 ml, the US legal cup used on nutrition labels is 240 ml, and the metric cup used in Australia and in many international recipes is 250 ml[wikipedia-cup]. That 5–6% difference is enough to throw off delicate baking. Meanwhile, a metric kitchen scale in Berlin, Mumbai, or São Paulo measures in grams and milliliters, while a US measuring cup set in Ohio measures in cups, tablespoons (14.79 ml), and teaspoons (4.93 ml)[wikipedia-cooking-weights]. The translator between these worlds is density: mass = volume × density[mcgee-food-cooking].

This calculator is that translator. Pick an ingredient, enter an amount in the unit you have, and it converts to the unit you need — cups to grams, grams to ounces, milliliters to cups — using the ingredient's real density from USDA FoodData Central[usda-fdc] and the USDA National Agricultural Library food composition data[usda-nal-composition] and King Arthur's weight chart[king-arthur-weight-chart]. It shows both imperial and metric equivalents side-by-side so a reader in Spain, India, or Chile can follow a US recipe without guessing, and a US baker can follow a metric recipe without hunting for a scale conversion chart[nist-units].

For scaling a whole recipe up or down after conversion, the Recipe Scaler handles proportional math; for dough hydration ratios the Sourdough Calculator and Pizza Dough Calculator go deeper.

How to Use This Calculator

You need three choices: ingredient, amount, and units. The worked example below uses the most common search — "1 cup flour in grams" — then shows the reverse.

Example 1 — US recipe, metric kitchen: 1 cup all-purpose flour → grams.

1. Choose ingredient. Select All-purpose flour. The calculator loads its density: 120 g per US cup (236.588 ml)[king-arthur-weight-chart].
2. Enter amount. Type 1.
3. Choose from → to units. Set From: cups and To: grams. If your scale also shows ounces, the result line includes ounces (4.23 oz) and milliliters (236.6 ml) for reference[nist-units].
4. Press Calculate. Result: 120 g (4.23 oz). If you need 2 cups for a double batch, enter 2 → 240 g (8.47 oz).

Example 2 — metric recipe, US cups: 200 g granulated sugar → cups.

1. Ingredient: Granulated sugar (198 g per cup)[king-arthur-weight-chart].
2. Amount: 200, From: grams, To: cups.
3. Calculate → 1.01 cups (about 1 cup + 0.5 tsp, 7.05 oz, 236.9 ml).

Example 3 — small volume: 3 tablespoons butter → grams.

Butter is 227 g per cup, so 1 tablespoon (14.79 ml) = 14.2 g. Enter 3, From: tablespoons, To: grams, ingredient Butter → 42.6 g (1.50 oz).

Tips while entering:

• Use the ingredient closest to what you have. Bread flour (127 g per cup) and whole wheat (130 g per cup) differ from all-purpose — picking the wrong flour shifts the result by 6–8%[king-arthur-weight-chart].
• For ingredients not listed (e.g., honey, oil), pick the nearest density or use water as a proxy only for thin liquids — honey is 1.42× denser than water, so 1 cup water 236.6 g but 1 cup honey 336 g.

The Formula

Every conversion is volume ↔ mass via density. The calculator stores density as grams per US cup (g / 236.588 ml) for each ingredient[king-arthur-weight-chart], then converts through grams as the pivot.

Let:

• D = density of the chosen ingredient in grams per US cup (g/cup)
• V_cup = volume in US cups
• M_g = mass in grams

Grams per cup to grams per milliliter is D / 236.588, but the cup-based form is more intuitive for cooks:

To handle the full unit set, the calculator first normalizes the input to grams or to cups, then converts to the target:

where V_cup-to-input is how many input-units make one cup (e.g., 16 tablespoons per cup, 48 teaspoons per cup, 236.588 ml per cup)[wikipedia-cooking-weights].

Similarly:

where f_input-to-g converts the input mass unit to grams (1 oz = 28.3495 g, 1 lb = 453.592 g)[nist-units].

Reference Table

One US cup (236.588 ml, 16 tablespoons, 48 teaspoons) of common ingredients, with metric and imperial weights. The chart below makes the density spread visual — flour and powdered sugar cluster near 120 g, granulated sugar near 200 g, butter at 227 g.

The table also shows why "1 cup in grams" has no single answer — the question must name the ingredient. Asking "how many grams in 1 cup" without the ingredient is like asking "how long is a piece of string" — the answer ranges from 81 g to 227 g in this short list, and honey would be 336 g[mcgee-food-cooking].

Practical Tips

1. Match the flour exactly. All-purpose (120 g), bread (127 g), and whole wheat (130 g) differ by up to 8%. For sourdough, use the Sourdough Calculator starter weight after converting.
2. Spoon and level vs scoop. The chart assumes the "spoon and level" method (fluff, spoon into cup, level). Scooping directly from the bag compacts flour to 140–150 g per cup — 17–25% heavy. For precision, weigh; for volume, spoon and level[king-arthur-weight-chart].
3. Butter shortcuts: sticks and tablespoons. In the US, 1 stick = 8 tablespoons = 113.5 g (4 oz); 1 cup = 2 sticks = 227 g. The calculator handles tablespoons directly — 3 tablespoons butter = 42.6 g. In metric, 1 tablespoon = 14.79 ml, 1 teaspoon = 4.93 ml[wikipedia-cooking-weights].
4. Powdered vs granulated sugar are not interchangeable by cup. 1 cup powdered (113 g) is 43% lighter than 1 cup granulated (198 g). Converting by weight avoids the error.
5. Scale once, note your cups. If you bake a favorite recipe often, weigh 1 cup of your usual flour on your scale and note it (e.g., "my cup = 122 g"). Future batches can be scaled by weight with the Recipe Scaler without re-measuring volume.
6. Watch the cup standard. If a recipe says "1 cup" and was written in Australia or uses metric cups, it means 250 ml, not 236.6 ml. For flour, that is 127 g vs 120 g — a 6% difference. When in doubt, the gram weight in the recipe is the ground truth; the cup is the approximation[wikipedia-cup].

Limitations

• Density varies by brand, grind, humidity, and packing. The chart uses King Arthur and USDA averages[king-arthur-weight-chart][usda-fdc]. A fine whole wheat, a humid day, or a compacted bag can shift flour by 5–10 g per cup. For critical formulas (macarons, sourdough), weigh the ingredient rather than converting.
• US cup assumption. The calculator uses the US customary cup (236.588 ml). Metric (250 ml) and Imperial (284 ml, rare today) cups differ[wikipedia-cup]. If your recipe uses metric cups, mentally add ~5.7% to the gram result, or enter milliliters instead of cups.
• Ingredient list is finite. Eight staples cover ~80% of baking searches ("1 cup flour", "1 cup sugar", etc.), but honey (336 g/cup), oil (~218 g/cup), and cocoa (85 g/cup) are not yet included — use the closest density or request the ingredient. Future versions may add a custom density input.
• Volume units are cooking volumes, not fluid ounces by weight. Fluid ounces (fl oz) measure volume (29.574 ml), while ounces (oz) measure weight (28.3495 g). The calculator treats cups, tablespoons, teaspoons, and milliliters as volumes and grams/ounces/pounds as weights — never mixing the two without density[nist-units].
• Temperature not modeled. Flour and sugar densities change negligibly with kitchen temperature; liquids like butter and oil change more (butter softens). The calculator assumes room-temperature, settled dry ingredients.

Frequently Asked Questions

❓ How many grams are in 1 cup of all-purpose flour?

✅ About 120 grams (4.23 ounces) per US cup when spooned and leveled. Scooping directly from the bag packs 140–150 grams. Bread flour is 127 grams and whole wheat is 130 grams per cup.

❓ Why does 1 cup of sugar weigh more than 1 cup of flour?

✅ Because sugar is denser. Granulated sugar packs at 198 grams per cup while all-purpose flour is 120 grams — sugar is 65 percent heavier for the same volume. Density, not a universal 'cup to grams' factor, determines the conversion.

❓ Is a US cup the same as a metric cup?

✅ No. A US customary cup is 236.588 milliliters, a US legal cup is 240 milliliters, and a metric cup is 250 milliliters. For flour that is 120 versus 127 grams — about a 6 percent difference. Use the gram weight when precision matters.

❓ Can I convert cups to grams without knowing the ingredient?

✅ No. The same '1 cup' is 81 grams of rolled oats but 227 grams of butter. You must name the ingredient so the calculator can apply the correct density.

❓ How do I convert grams back to cups?

✅ Divide grams by the ingredient's grams-per-cup. For example, 200 grams granulated sugar divided by 198 grams per cup equals 1.01 cups. The calculator does this automatically when you choose grams as the From unit and cups as To.

❓ Are your densities for spooned or scooped flour?

✅ Spooned and leveled, per King Arthur's method. Scooped flour can be 17–25 percent heavier. For best accuracy, weigh flour on a scale.

❓ Does this work for liquids like milk or water?

✅ Yes for thin liquids — 1 US cup water is 236.588 milliliters and about 236.6 grams. For honey, oil, or syrup the density differs, so the result will be off if you use a dry-ingredient density. Those ingredients need their own densities.

❓ What is the difference between fluid ounces and ounces?

✅ Fluid ounces measure volume (1 US cup = 8 fluid ounces = 236.588 milliliters) while ounces measure weight (1 cup flour = 4.23 ounces). The calculator keeps them separate and converts via density.