So, how many grams is a tablespoon of water? About 14.8 g in a US tablespoon. A US tablespoon holds 14.79 ml, and water weighs about 1 g per ml at room temperature, so the milliliters and grams line up almost perfectly.
| Amount | Volume | Water (grams) |
|---|---|---|
| 1/4 tsp | 1.2 ml | 1.2 g |
| 1/2 tsp | 2.5 ml | 2.5 g |
| 1 tsp | 4.9 ml | 4.9 g |
| 1 tbsp | 14.8 ml | 14.8 g |
| 1/4 cup | 59 ml | 59 g |
| 1/2 cup | 118 ml | 118 g |
| 1 cup | 237 ml | 237 g |
Every row comes from the same math: 14.79 ml per tablespoon, 3 teaspoons per tablespoon and 16 tablespoons per cup, with water at about 1 g per ml. You'll often see a tablespoon of water rounded to 15 g, and for cooking that's perfectly fine.
Why the grams in a tablespoon of water can change
Water is the easiest ingredient to convert, but a few things still nudge the number:
- Which tablespoon. A US tablespoon is 14.79 ml. A metric tablespoon, used in the UK and Canada, is 15 ml. An Australian tablespoon is 20 ml, so a tablespoon of water there is about 20 g. If a recipe comes from Australia, that difference adds up fast.
- Your spoon. Everyday flatware isn't a measuring spoon. A soup spoon from the drawer can hold a lot more or a lot less than a true tablespoon.
- Filling to the brim. Surface tension lets water bulge above the rim. A brimming spoon weighs a bit more than a carefully leveled one.
- Temperature. Water expands slightly as it heats, so hot water weighs a touch less per spoon than cold. It's a tiny effect in a home kitchen.
How to measure water by weight
- Set your bowl, cup or spoon on the scale.
- Press tare so the display reads zero.
- Pour slowly until you reach your target, such as 14.8 g for one tablespoon or 237 g for a cup.
- For tiny amounts, pour from a small cup instead of the tap so you don't overshoot.
Weighing water is handy because it skips reading a measuring cup at eye level. Grams are grams, no matter what container you pour into.
When grams of water really matter
For boiling pasta, nobody needs a scale. But some recipes are surprisingly sensitive to small amounts of water:
- Bread dough. Bakers talk about hydration, the weight of water compared to the weight of flour. A tablespoon or two of extra water changes how sticky a dough feels.
- Pie crust. Many recipes add ice water a tablespoon at a time. Weighing each addition, about 14.8 g, tells you exactly how much went in, so you can repeat it next time.
- Coffee and tea. Brew ratios are written in grams of water to grams of coffee. Our guide on how to measure coffee grounds uses the same idea.
- Thinning sauces and glazes. A teaspoon of water is only about 4.9 g. Weighing helps you add just enough.
Common mistakes to avoid
- Mixing up tablespoon sizes. Check where the recipe comes from before converting.
- Weighing with a wet container. Drops left in the bowl from last time add weight. Tare after drying, not before.
- Using water weight for other liquids. Milk, oil, honey and vanilla all weigh differently per spoon, so check each one.
A practical tip for small liquid amounts: a MeasureMate digital measuring spoon scoops and weighs in one step and reads in 0.1 g steps, so a tablespoon of water shows up as 14.8 g right in the spoon. It also switches between grams, ounces and other units, and the tare button zeroes it between pours.
Quick questions
Is a tablespoon of water 15 grams?
Close enough for most cooking. A US tablespoon is 14.79 ml, so it holds about 14.8 g of water; a metric tablespoon holds 15 g.
How many grams is a teaspoon of water?
About 4.9 g in a US teaspoon, which is one third of a tablespoon.
How many grams is a cup of water?
About 237 g in a US cup, which is 16 tablespoons.
Weights based on US customary measures (1 tbsp = 14.79 ml) and the density of water, about 1 g per ml.