Why does a cup of flour weigh less than a cup of sugar?

Because weight per volume depends on density. A US cup of all-purpose flour is about 125 g, while a US cup of granulated sugar is about 200 g and a US cup of honey is about 340 g. That is exactly why a generic "grams to cups" rule fails — you must pick the ingredient, which this tool does.

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

About 125 g per US cup (8 fluid ounces). Spoon-and-level flour into the cup rather than scooping, which can pack in 20 to 30 percent more. The exact figure varies with flour type and humidity, so weighing on a scale is always the most reliable method.

Which cup size does this converter use?

It supports both. The US cup is 236.59 mL (8 US fluid ounces) with a US tablespoon of 14.79 mL and teaspoon of 4.93 mL. The metric cup is 250 mL with a 15 mL tablespoon and 5 mL teaspoon. Pick whichever matches your recipe.

How accurate are the conversions?

The unit maths is exact. The ingredient densities are standard kitchen-reference values (grams per US cup), which carry real-world variation — brand, humidity, and how firmly you pack or sift an ingredient can shift the weight by several percent. For baking, a digital scale beats any volume measure.

Can I convert tablespoons of butter to grams?

Yes. Select Butter, type the number of tablespoons (US or metric) into that field, and read the grams. One US tablespoon of butter is about 14.2 g, and one US cup of butter is about 227 g (roughly two sticks).

Is anything uploaded to a server?

No. The converter is 100 percent client-side. Every calculation runs in your browser using plain arithmetic, with no network requests, no tracking and no data leaving your device.

Cooking Weight to Volume Converter

A cooking weight-to-volume converter that turns grams, kilograms, ounces and pounds into cups, tablespoons and teaspoons — and back again — for the ingredient you actually have in front of you. Unlike a generic length or mass converter, a cup of one ingredient does not weigh the same as a cup of another: a US cup of flour is about 125 g, a US cup of sugar is about 200 g, and a US cup of honey is about 340 g. This tool fixes that by letting you pick the ingredient first, then converting through that ingredient’s density.

How it works

Every measurement is reduced to a canonical mass in grams. Weight units convert directly (1 oz = 28.3495 g, 1 lb = 453.59237 g). Volume units convert through the ingredient’s density — grams per millilitre — which the tool derives from the well-known “grams per US cup” cooking references. So when you type a volume, it becomes millilitres, then grams via grams = millilitres × density; when you type a weight, it runs the same chain in reverse. Type into any field in the live grid and all the others update instantly, or use the From / To selector at the top for a single clean answer with a swap button to flip the direction.

The volume definitions are precise. A US cup is 236.59 mL (8 US fluid ounces), a US tablespoon is 14.79 mL, and a US teaspoon is 4.93 mL. The metric cup is 250 mL with a 15 mL tablespoon and 5 mL teaspoon. You choose whichever system your recipe uses, so a British, Australian or American recipe all convert correctly.

Worked example

Say a recipe lists 250 g of all-purpose flour but your measuring set only has cups. Select All-purpose flour (about 125 g per US cup). Type 250 into the grams field and the US-cup field shows 2 cups (250 ÷ 125). Switch the ingredient to granulated sugar (about 200 g per cup) and the same 250 g becomes 1.25 cups — the density change is the whole point. Need butter? At about 227 g per US cup, 113.5 g of butter is 0.5 cup, or roughly one stick.

Conversion reference (per US cup, 236.59 mL)

Ingredient	Grams per US cup	Density (g/mL)	1 tbsp (US)
Water	236.6 g	1.00	14.8 g
All-purpose flour	125 g	0.53	7.8 g
Granulated sugar	200 g	0.85	12.5 g
Brown sugar (packed)	220 g	0.93	13.7 g
Butter	227 g	0.96	14.2 g
Honey	340 g	1.44	21.2 g
Table salt	273 g	1.15	17.1 g
White rice (uncooked)	185 g	0.78	11.6 g

Densities are kitchen-reference figures and vary with brand, humidity and packing. For baking, a digital scale is always the most reliable tool. Every figure here is calculated in your browser — nothing is uploaded or stored.