sugar · conversions
How Many Grams of Sugar Are in a Tablespoon? (And Why It's Not Always the Same)
One tablespoon of granulated sugar is 12.5 g — but brown, powdered and caster sugar all differ. Here are the four figures and when each one applies.
By Ali RazaUpdated 6 min read
One level US tablespoon of granulated white sugar weighs 12.5 grams. That is the answer most people are looking for, and it is worth stating plainly before anything else — because the figure you will find repeated most often online is 15 grams, and that is wrong.
But "sugar" is not one ingredient. Four kinds turn up regularly in recipes, and they differ by nearly a factor of two.
| Sugar | Per tablespoon | Per teaspoon | Per cup |
|---|---|---|---|
| Granulated (white) | 12.5 g | 4.17 g | 200 g |
| Caster (superfine) | 14.06 g | 4.69 g | 225 g |
| Brown (firmly packed) | 13.75 g | 4.58 g | 220 g |
| Powdered (sifted) | 7.5 g | 2.5 g | 120 g |
Why powdered sugar is so much lighter
Powdered sugar is granulated sugar ground to a fine dust, usually with a little cornstarch added to stop it clumping. Grinding it that finely means the particles no longer nest together — a spoonful is substantially air.
The practical consequence: swapping powdered for granulated sugar by volume gives you 40% less sugar by weight. This is the fastest way to ruin an icing, and it happens often because both are white powders in similar bags.
Why caster sugar is heavier than granulated
This surprises people, since caster sugar is also finer. But caster is not ground to dust — it is simply a smaller crystal. Smaller crystals fill the gaps between each other more efficiently than large ones, so the same spoon holds about 12% more sugar by weight.
The difference is small enough that substituting caster for granulated in most recipes is fine. It matters when you are measuring large quantities by volume, where 12% compounds.
Brown sugar and the packing problem
Brown sugar is granulated sugar with molasses added back. The molasses coats each crystal, making the sugar slightly damp and — crucially — compressible. Press it into a spoon and it stays pressed.
Common quantities, worked out
| Grams | Tablespoons | Also equals |
|---|---|---|
| 12.5 g | 1 tbsp | 3 tsp |
| 25 g | 2 tbsp | ⅛ cup |
| 50 g | 4 tbsp | ¼ cup |
| 75 g | 6 tbsp | ⅜ cup |
| 100 g | 8 tbsp | ½ cup |
| 150 g | 12 tbsp | ¾ cup |
| 200 g | 16 tbsp | 1 cup |
Sugar is unusually cooperative here: because 200 g happens to be exactly one cup, most round gram figures land on clean fractions. Flour is not nearly so obliging.
The nutrition-label version
A teaspoon of granulated sugar is 4.17 g, which is where the widely repeated shorthand of "4 grams equals one teaspoon" comes from. It is accurate to within about 4%, which is close enough for making sense of a label.
So a 39 g can of soft drink contains roughly nine and a half teaspoons of sugar. Framed that way, the number tends to land rather harder than the gram figure does.
Getting it right
- Level the spoon with a straight edge. Heaping adds 50–100%.
- For brown sugar, press firmly unless told otherwise.
- Sift powdered sugar before measuring — it compacts badly in storage.
- If a recipe just says "sugar", it means granulated.