Tablespoon to Grams: Water, Milk & Oil Conversion Guide
1 tablespoon of water weighs 15 grams, milk 15.2 g and oil 13.6 g. Charts for 1.5 to 8 tbsp, the oil-for-butter swap, and a free liquid calculator.
Quick answer: 1 tablespoon of water = 15 grams
1 tablespoon of water weighs 15 grams in a 15 ml metric spoon, or 14.8 g in a US tablespoon.
Water is the baseline. Every other tablespoon to grams figure gets compared to it. The two liquids people ask about next sit either side of water:
- Water: 15 g (14.8 g US)
- Whole milk: 15.5 g (15.2 g US)
- Oil: 13.8 g (13.6 g US)
Pick your liquid and spoon size in the calculator below. It converts tbsp to grams and grams back to tbsp.
Liquids Converter
7 items · Density varies by itemWhy liquids are the easy case
Water has a density of 1 g per ml. One milliliter weighs one gram. That’s how the gram was defined in the first place, and it makes the math disappear: millilitres in, grams out.
So a 15 ml tablespoon of water weighs 15 g. A 5 ml teaspoon weighs 5 g. A 240 ml cup weighs 240 g.
Dry ingredients don’t work this way. A spoonful of flour is half air, so it weighs about 8 g instead of 15 g, and the number moves depending on how you fill the spoon. Liquids pour into every corner of the spoon the same way every time. Fill a spoon with milk twice and you get the same weight twice.
Kitchen liquids sit in a narrow band around water:
- Milk is a little heavier than water. It carries sugars, protein and minerals dissolved in it.
- Cream is a little lighter. It’s milk with more fat, and fat is light.
- Oil is lighter still, at about 0.92 g/ml.
The whole range from oil to milk is roughly 13.5 g to 15.5 g per tablespoon. For water-like liquids, 15 g per tablespoon is a fair guess. For oil, take off about 8%.
Liquid tablespoon to grams table
| Liquid | Density (g/ml) | US tbsp (14.8 ml) | UK / metric tbsp (15 ml) | Australian tbsp (20 ml) |
|---|---|---|---|---|
| Water | 1.00 | 14.8 g | 15.0 g | 20.0 g |
| Skim milk | 1.035 | 15.3 g | 15.5 g | 20.7 g |
| Whole milk | 1.03 | 15.2 g | 15.5 g | 20.6 g |
| Heavy cream | 0.99 | 14.6 g | 14.9 g | 19.8 g |
| Olive oil | 0.92 | 13.6 g | 13.8 g | 18.4 g |
| Vegetable oil | 0.92 | 13.6 g | 13.8 g | 18.4 g |
| Melted butter | 0.92 | 13.6 g | 13.8 g | 18.4 g |
A cup of whole milk weighs about 244 g, which is what USDA’s FoodData Central lists. That works out to the 15.2 g per tablespoon above. USDA puts a tablespoon of olive oil at 13.5 g, near enough to our 13.6 g.
A few notes:
- Skim milk is heavier than whole milk. Take the fat out and what’s left is closer to water plus dissolved solids. The gap is about 0.1 g per spoon. You’ll never notice it, but it surprises people.
- Olive oil and vegetable oil weigh the same per spoon, near enough. Canola, sunflower, corn and peanut oil all land within a tenth of a gram of each other.
- Melted butter behaves like oil, since it’s mostly fat. A tablespoon of already-melted butter weighs about 13.6 g. Measure the butter solid, though, and you get 14.2 g per tablespoon, since you’re weighing a solid block of it. The butter guide covers that difference.
Why oil weighs less than water
Oil floats on water. You’ve seen it in a salad dressing that’s been sitting out. Floating means lighter, and that’s the whole answer.
Oil’s density is about 0.92 g per ml against water’s 1.00. So the same tablespoon holds about 8% less weight in oil:
- 1 tbsp water = 14.8 g (US spoon)
- 1 tbsp oil = 13.6 g (US spoon)
The gap is 1.2 g per spoon. Over ¼ cup, that’s about 5 g.
The reason is what fat molecules look like. They’re long chains that can’t pack together tightly. Water molecules are small and pull on each other, so they sit closer together. More molecules in the same space means more weight.
This is the same reason butter weighs less than water per spoon, and why honey weighs more. Honey is sugar dissolved in water, and sugar is heavy.
Tablespoon to grams chart: water, milk and oil
| Tablespoons | Water (US) | Water (15 ml) | Whole milk (US) | Oil (US) |
|---|---|---|---|---|
| 1 tbsp | 14.8 g | 15.0 g | 15.2 g | 13.6 g |
| 1.5 tbsp | 22.2 g | 22.5 g | 22.8 g | 20.4 g |
| 2 tbsp | 29.6 g | 30.0 g | 30.5 g | 27.2 g |
| 3 tbsp | 44.4 g | 45.0 g | 45.7 g | 40.8 g |
| 4 tbsp (¼ cup) | 59.1 g | 60.0 g | 60.9 g | 54.4 g |
| 6 tbsp | 88.7 g | 90.0 g | 91.4 g | 81.6 g |
| 8 tbsp (½ cup) | 118.3 g | 120.0 g | 121.8 g | 108.8 g |
For other amounts, multiply by 14.8 for water, 15.2 for milk, or 13.6 for oil in a US spoon. With a 15 ml metric spoon, multiply by 15, 15.5 and 13.8.
Going the other way is just as simple. 100 g of water is about 6.8 US tablespoons. 100 g of oil is about 7.4.
Two handy anchors: 16 tablespoons make a cup, and a US cup of water weighs about 237 g.
Swapping oil for butter by weight
Many cakes, muffins and quick breads work with either oil or butter. Butter is about 80% fat and oil is 100% fat, so you need less oil.
- By weight: use about 75–80 g of oil for every 100 g of butter.
- By volume: use 3 tablespoons of oil for every 4 tablespoons of butter.
In grams, 4 tablespoons of butter is 56.8 g and 3 tablespoons of oil is 40.8 g. The missing weight is the water that was in the butter, so the batter comes out slightly drier unless you add a splash of milk.
Oil-based cakes stay moist longer. Butter-based ones taste richer and hold air better when creamed with sugar. Don’t swap oil into pastry, shortbread or anything that needs cold, solid fat. The butter tablespoon to grams guide has the full swap in both directions.
Does temperature change the conversion?
Not enough to matter in cooking.
Water is heaviest at 4°C and gets slightly lighter as it warms. A US tablespoon of ice-cold water weighs 14.79 g. At 60°C, it weighs about 14.54 g. Straight off the boil, about 14.2 g. So the spread from fridge to boiling is half a gram.
Milk and oil behave the same way: a fraction of a percent per spoon between fridge-cold and room temperature.
Two practical notes instead:
- Cold oil is thick. Olive oil kept in the fridge turns cloudy and semi-solid, and it won’t fill a spoon evenly. Let it warm up first.
- Skimming matters more than temperature. If cream has risen in unhomogenized milk, stir it before measuring. The fat on top is lighter than the milk below.
If you want the exact weight, weigh it. A kitchen scale skips the spoon and the question entirely.
Frequently asked questions
Is 1 tablespoon of water always 15 grams?
It depends on the spoon. A 15 ml metric tablespoon of water weighs 15 g. A US tablespoon holds 14.79 ml, so it weighs 14.8 g. A 20 ml Australian tablespoon holds 20 g. Temperature shifts it by a fraction of a gram, which won't matter in a recipe.
How many grams is 3 tablespoons of milk?
3 US tablespoons of whole milk weigh about 46 g (45.7 g). With 15 ml metric tablespoons, 3 tbsp weigh 46.4 g. Skim milk is a touch heavier than whole milk, by about 0.1 g per tablespoon.
Is oil heavier or lighter than water per tablespoon?
Lighter. A US tablespoon of oil weighs about 13.6 g, against 14.8 g for water. Oil's density is about 0.92 g/ml compared to water's 1.00 g/ml. That's why oil floats on top of water.
More tablespoon to grams conversions
- Water tablespoon to grams calculator: converter, formula and a full conversion table for water.
- How many grams are in a tablespoon?: the full guide for every common ingredient.
- Butter tablespoon to grams (US, UK & Australia): the other half of the oil-for-butter swap.
- Sugar tablespoon to grams (white, brown & powdered)
- Flour tablespoon to grams (plain, all-purpose & UK flour)
- Honey, maple syrup & golden syrup tablespoon to grams
- Tablespoon to grams calculator: convert 35 ingredients both ways.