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A cup is a volume and a gram is a mass, so there is no single cups-to-grams number. Here is why flour is the…
Cups to Grams — Water
Converts us cup of water to gram using its real density, not a generic volume factor. One us cup is 236.6 gram.
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In short
One us cup of water is 236.6 gram. Going the other way, one gram is 0.0042265427 us cup. That works out at 2 us cup = 473.2 gram and 4 = 946.4. The figure comes from water weighing 236.6 g per US cup — a generic cups-to-grams converter assumes water and will give you the wrong answer here, because volume to weight depends entirely on what is in the cup.
How to use the Cups to Grams — Water
- Type the value you want to convert.
- Pick the unit you are converting from and the unit you want.
- The converted value and the exact conversion factor are shown instantly.
About the Cups to Grams — Water
Water is the reference point every other ingredient is measured against: one millilitre weighs one gram, at least at room temperature. It is the only common kitchen ingredient where volume and weight are genuinely interchangeable, which is exactly why using a cup for anything else introduces error. A US cup is 236.6 ml; a metric cup is 250 ml and a UK cup 284 ml. The figure this page works from is 236.6 g per US cup, the spooned-and-levelled weight recorded by King Arthur Baking and the USDA food database. Converting us cup to gram for water, the amounts that come up most often are: 1/4 us cup = 59.2 gram; 1/3 us cup = 78.9 gram; 1/2 us cup = 118 gram; 2/3 us cup = 158 gram; 3/4 us cup = 177 gram; 1 us cup = 237 gram; 1 1/2 us cup = 355 gram; 2 us cup = 473 gram; 3 us cup = 71 gram.
What people use it for
- Following a US recipe with a kitchen scale instead of cup measures.
- Scaling a recipe up or down without compounding measuring error.
- Converting a European recipe written in grams into cups.
Details
| 1 US cup of water | 236.6 g |
|---|---|
| 1 US cup | 236.6 Gram |
| 1 Gram | 0.0042265427 US cup |
| Worth knowing | A US cup is 236.6 ml; a metric cup is 250 ml and a UK cup 284 ml. |
The maths behind it
This tool uses gram = us cup × 236.6, derived from water weighing 236.6 g per US cup. Every intermediate value is shown on screen, so the result can be checked by hand.
Water is the reference point every other ingredient is measured against: one millilitre weighs one gram, at least at room temperature. It is the only common kitchen ingredient where volume and weight are genuinely interchangeable, which is exactly why using a cup for anything else introduces error.
Where this tool stops
Volume-to-weight conversion is inherently approximate. Humidity, brand, how finely something is milled and how long it has sat in the cupboard all shift the figure by a few per cent.
Explained in our guides
All guidesFrequently asked questions
Why can I not use the same conversion for other ingredients?
Because only water has a density of 1. Flour is about 0.53, honey about 1.44 — nearly a threefold spread. A generic "cups to grams" converter that ignores the ingredient is giving you the water answer for everything.
Why does a cup of water not weigh the same as a cup of water?
Because a cup measures volume and a scale measures weight, and the two only agree for water. Water has its own density — 236.6 g per US cup — so any generic volume converter gives the wrong answer here.
How much does the way I fill the cup matter?
Not at all. Water finds its own level, so a cup is 236.6 g every single time — which is exactly why water is the reference every generic converter secretly assumes. It is also the only ingredient for which millilitres and grams are interchangeable, because its density is 1 g per millilitre by definition.
Is a US cup the same as a UK or metric cup?
No. A US cup is 236.6 ml, a metric cup is 250 ml and an old UK cup is 284 ml. These pages use the US cup, because that is what US recipes mean.
Do I need an account to use the Cups to Grams — Water?
There is no cost and no cap. The Cups to Grams — Water is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this tool?
No. The Cups to Grams — Water runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What formula does the Cups to Grams — Water use?
It uses gram = us cup × 236.6, derived from water weighing 236.6 g per US cup. The full working is printed under the result, so you can follow every step rather than trusting a black box.
Give me a worked example.
Enter 2 us cup of water and the Cups to Grams — Water returns 473.2 gram.
What problem does the Cups to Grams — Water solve?
Typical uses: following a US recipe with a kitchen scale instead of cup measures. Scaling a recipe up or down without compounding measuring error. Converting a European recipe written in grams into cups. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
What are the limits of the Cups to Grams — Water?
Volume-to-weight conversion is inherently approximate. Humidity, brand, how finely something is milled and how long it has sat in the cupboard all shift the figure by a few per cent. Knowing where a tool stops being trustworthy matters more than the cases where it works.
What are the reference figures here?
1 US cup of water is 236.6 g. 1 US cup is 236.6 Gram. 1 Gram is 0.0042265427 US cup. These are printed on the page itself, so you do not have to take them on trust.
Is the number rounded?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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