How Many Grams of Sugar Are in a Teaspoon?

Granulated sugar is the default — what a recipe means when it just says "sugar". Its crystals are uniform and free-flowing, they do not absorb much moisture, and they neither compress nor clump. That makes it the most reliably measurable ingredient in the kitchen: 4.2 g per level teaspoon, consistently, in anyone's kitchen.

Brown sugar is granulated sugar with molasses added back. The molasses makes it moist and sticky, so it clumps rather than pours. Recipes account for this by specifying "packed" — you press it into the spoon or cup, compressing out the air. Packed, a teaspoon comes to 4.6 g, about 10% more than granulated. Spooned in loosely it can weigh a third less, which is why the word "packed" is doing real work in a recipe and should not be ignored.

Powdered sugar — also sold as confectioners' sugar or icing sugar — is granulated sugar milled to a dust and cut with a few percent of cornstarch to stop it caking. It holds a remarkable amount of air: 2.5 g per teaspoon, barely 60% of the granulated figure. Recipes almost always sift it, which aerates it further.

The arithmetic is one division: grams ÷ 4.2 = teaspoons, for granulated sugar. Working through the amounts people actually look up:

Going from tsp to g is the same figure used as a multiplier rather than a divisor. Two teaspoons of granulated sugar is 8.4 g, three is 12.6 g — which is also one tablespoon, since a tablespoon is exactly three teaspoons — and a quarter teaspoon is 1.1 g.

Substitute a different sugar and the multiplier changes with it. The same two teaspoons is 9.2 g as packed brown sugar and 5.0 g as powdered — which is why swapping one sugar for another by volume quietly changes how much sugar is in the recipe.

The number is derived, not looked up. Granulated sugar has a bulk density of about 0.85 grams per millilitre. A US legal teaspoon is exactly 4.92892159375 millilitres. Multiply the two and you get 4.2 g — which is why you will see this figure in nutrition guidance, on packaging, and in recipe conversion tables the world over.

The consistency is worth appreciating. Unlike flour, which varies 20% depending on whether you scoop or spoon it, and unlike kosher salt, which varies by brand, granulated sugar behaves the same everywhere. If you want to test a conversion site against your own scale, sugar is the ingredient to test it with.

Nutrition labels report sugar in grams because grams are precise and internationally consistent. The problem is that almost nobody has an intuition for what 35 g of sugar looks like. Divide by 4.2 and it becomes teaspoons — a measure everyone can picture — which is exactly why public-health campaigns present sugar that way.

A 330 ml can of regular cola contains around 35 g of sugar, which is 8.3 teaspoons. The World Health Organization's suggested daily limit for free sugars is roughly 25 g for an adult, or 6.0 teaspoons. Put those two numbers next to each other and a single can accounts for well over a day's allowance.

One caveat: labels count all free sugars, not just white granulated sugar. Honey, syrups and fruit-juice concentrate all count, and honey is far denser — 7.0 g per teaspoon against 4.2 g. A recipe reformulated from sugar to honey by volume does not contain the same amount of sugar by weight.

Above roughly 50 g, teaspoons stop being practical. 50 g of sugar is 12 teaspoons — nobody is counting that out. Switch to tablespoons (3 teaspoons each), to cups (48 teaspoons), or better, to a scale.

Teaspoons earn their place at the small end: a quarter teaspoon of sugar in a spice rub, two teaspoons in a cup of coffee, the sugar in a single serving of something. That is the range where a spoon is faster than a scale and accurate enough to not matter.