Water Grams to Cups Converter
Convert water from grams to cups using ingredient-specific baking measurements.
100 grams of water ≈ 0.42 US cups
About ⅓ cup + 1 tablespoon + 1 teaspoon
Based on 1 US cup of water = 240g
Convert grams to cups
Enter an amount greater than 0.
100 grams of water equals
0.42 US cups
⅓ cup + 1 tbsp + 1 tsp
- Tablespoons 6.67 tbsp
- Teaspoons 20 tsp
- Milliliters 100 ml
Based on 1 US cup of water = 240g
Customize grams per cup
Enter a number of grams greater than 0.
Conversions are approximate and may vary by ingredient brand, packing, humidity, and measuring method. Spoons: 15 ml tablespoon, 5 ml teaspoon. Kitchen estimates have up to 10% volume rounding error; very small amounts use a threshold. See Methodology for the policy.
How this conversion is calculated
Adopted reference value
1 US cup of Water = 240g
Ingredient record reviewed: 2026-08-05
Cup type
US cup / 240 ml
Measuring method
Fresh water, near room temperature · poured to the 240 ml line and read at eye level
Water grams to cups conversion table
| Grams | Cups | tbspTablespoons | tspTeaspoons | ml |
|---|---|---|---|---|
| 25g | 0.10 cups | 1.67 | 5 | 25 |
| 50g | 0.21 cups | 3.33 | 10 | 50 |
| 75g | 0.31 cups | 5 | 15 | 75 |
| 100g | 0.42 cups | 6.67 | 20 | 100 |
| 120g | 0.50 cups | 8 | 24 | 120 |
| 125g | 0.52 cups | 8.33 | 25 | 125 |
| 150g | 0.63 cups | 10 | 30 | 150 |
| 200g | 0.83 cups | 13.33 | 40 | 200 |
| 225g | 0.94 cups | 15 | 45 | 225 |
| 240g | 1.00 cups | 16 | 48 | 240 |
| 250g | 1.04 cups | 16.67 | 50 | 250 |
| 300g | 1.25 cups | 20 | 60 | 300 |
| 400g | 1.67 cups | 26.67 | 80 | 400 |
| 500g | 2.08 cups | 33.33 | 100 | 500 |
Kitchen fraction approximation
¼ cup
≈ 60g
⅓ cup
≈ 80g
½ cup
≈ 120g
⅔ cup
≈ 160g
¾ cup
≈ 180g
Sources & how they compare
| Source | Reported value | Comparable source-cup value | Type | Method the source states | Adopted here | Checked |
|---|---|---|---|---|---|---|
| U.S. Geological Survey — Water Density | 1 g per 1 ml | 240g | Direct | fresh-water density; temperature dependent | Adopted | 2026-08-05 |
| King Arthur Baking — Ingredient Weight Chart | 227 g per 1 cup (volume not stated) | 227g | Direct | not stated (the chart lists weights only) | 2026-08-05 |
Measuring step this site recommends: poured to the 240 ml line and read at eye level.
When sources disagree, follow your recipe: use its gram weights if it gives them, or measure the way its author did. The adopted value is one stated convention, not a correction of the other sources.
A comparable source-cup value only scales a half-cup or tablespoon serving to one source cup. When a source does not state the cup's exact volume, we do not present it as a fixed-milliliter normalization.
Measurement notes
- At ordinary kitchen temperatures, fresh water is close to 1 gram per milliliter, so 240 ml is about 240g.
- Temperature and dissolved minerals change density slightly; this difference is usually immaterial in home baking.
- Use a liquid measuring cup on a level surface and read the bottom of the meniscus at eye level.
Common mistakes
- Assuming every baking ingredient weighs 240g per cup, as water does.
- Filling a 250 ml metric cup for a recipe written in US cups, which holds more water than the recipe expects.
Convert other ingredients in your recipe
Milk
1 cup = 244g · 100g ≈ 0.41 cups
View conversion →
Plain whole-milk yogurt
1 cup = 245g · 100g ≈ 0.41 cups
View conversion →
Bread flour
1 cup = 120g · 100g ≈ 0.83 cups
View conversion →
Honey
1 cup = 339g · 100g ≈ 0.29 cups
View conversion →
Each link converts that ingredient with its own cup weight; none of them is a substitute for this one.
Related amount conversions
Frequently asked questions
How many cups is 100 grams of water?
100 grams of water is about 0.42 cups, based on 1 US cup (240 ml) = 240g.
How many grams are in 1 cup of water?
1 US cup of fresh water near room temperature weighs about 240 grams when poured to the 240 ml line and read at eye level.
Does 1 cup of water weigh the same in a metric cup?
No. A metric cup (250 ml) holds slightly more than a US cup (240 ml), so 1 metric cup of water is about 250g, compared with 240g in a US cup.
What's the best way to measure water accurately?
Pour the water to the 240 ml line and read it at eye level. Use a kitchen scale when your recipe calls for a precise weight.
Can I convert cups of water back to grams?
Yes, use the Cups to Grams tool with water selected to convert any cup amount back into grams.
Why does water convert differently from other ingredients?
Grams measure weight and cups measure volume, so the conversion depends on how dense water is. A denser or lighter ingredient weighs a different amount per cup.