3/4 cup of caster sugar is about 142.5 g — three quarters of a 190 g cup, spooned and levelled, according to King Arthur Baking. This guide walks through the table, real recipe scenarios, and the common errors that make a 3/4-cup measure drift.
3/4 cup of caster sugar in grams
| Amount | Grams (approx.) |
|---|---|
| 1/8 cup | 23.8 g |
| 1/4 cup | 47.5 g |
| 1/3 cup | 63.3 g |
| 1/2 cup | 95 g |
| 2/3 cup | 126.7 g |
| 3/4 cup | 142.5 g ← this page |
| 1 cup | 190 g |
| 1 1/2 cups | 285 g |
| 2 cups | 380 g |
All figures are approximate. One US cup of caster sugar weighs 190 g spooned and levelled (King Arthur Baking), and every fraction above is calculated from that figure. When the result matters — a cake, a loaf, a sauce you cannot remake — verify with a kitchen scale.
What 3/4 cup of caster sugar looks like in the kitchen
3/4 cup of caster sugar is a modest heap — about four tablespoons, or a small handful if you are working with a dry ingredient. In a standard measuring cup it fills the cup to the 3/4 cup line, but volume alone does not tell you the weight, because caster sugar settles differently depending on how you fill the cup Fine-grained white sugar that dissolves faster than granulated sugar. The safest way to picture it is on the scale: tare your bowl, pour or spoon caster sugar in until the display reads about 142.5 g, and stop. That reading is worth more than any mental image of a heap or a level cup, because it does not depend on how hard you pressed or how humid the day is.
Worked examples
Example 1: a recipe that lists weight for everything else
Your recipe gives flour in grams and butter in grams, then suddenly asks for 3/4 cup of caster sugar. Stay in grams: 142.5 g keeps every ingredient on the same system, and your scale does the work. Add caster sugar to the bowl on the scale until the display reads 142.5 g, then move on to the next ingredient.
Example 2: measuring caster sugar for cocktails
Cocktails often needs a modest amount of caster sugar, and 3/4 cup is a typical quantity. Weighing 142.5 g straight into the pan or bowl avoids dirtying a measuring cup and keeps the amount exact. If you are cooking by feel, remember that caster sugar is fine-grained white sugar that dissolves faster than granulated sugar. so the weight, not the volume, is what the recipe writer was counting on.
Example 3: baking with a recipe from another country
Many recipes from the US list caster sugar in cups while the rest of your kitchen works in grams. Converting 3/4 cup to 142.5 g lets you follow the recipe without converting every other ingredient back to cups. Keep the conversion table below bookmarked: the same 190 g-per-cup figure gives you every fraction from 1/8 cup to two cups.
How 3/4 cup of caster sugar is measured
The figure of 142.5 g is based on caster sugar measured spooned and levelled, following King Arthur Baking. One full cup weighs 190 g under that method, and 3/4 cup is simply that figure multiplied by 0.75. That is why the headline number is labelled approximate: it is a calculation from a published full-cup density, not a measurement of the exact spoonful in your kitchen.
If your caster sugar was measured differently, the weight changes. A scooped cup packs more in; a sifted cup holds less; a packed cup of a sticky ingredient holds far more than a spooned one. The method matters as much as the number, which is why every conversion on this site states its method alongside its source. When a recipe matters — a celebration cake, a loaf of bread you have been planning, a sauce you cannot remake — weigh the caster sugar on a kitchen scale and let the scale settle the argument. 142.5 g is a good target; the scale tells you when you have actually hit it.
King Arthur Baking is the source for the full-cup figure, and this site uses that value consistently across every caster sugar page, so the quarter-cup, half-cup and full-cup figures all agree with each other. If you have seen a different number elsewhere, it almost certainly comes from a different method or a different source's rounding — not from a different ingredient.
Practical guidance for caster sugar
Meringues, cocktails, shortbread and custards. Sweetness is the obvious role, but caster sugar also affects moisture, browning and texture. 3/4 cup at 142.5 g is a small dose, yet in a small batch it can be the difference between a balanced bake and one that is cloyingly sweet or oddly pale.
Storage changes the number too. Airtight container, cool and dry, indefinitely. Sugar that has absorbed moisture clumps and packs more densely, so a cup weighed on a humid day can be heavier than the same cup in dry conditions. Keep it sealed and break up clumps before measuring.
The most common failure with caster sugar is oversweetening by volume. Because caster sugar is measured spooned and levelled, a careless scoop adds grams fast. If a recipe tastes too sweet, weigh the 142.5 g next time before changing anything else — the recipe is usually right and the measure is usually the problem.
Common mistakes with 3/4 cup of caster sugar
Measuring over the mixing bowl. Spills fall into the recipe and cannot be taken out cleanly. Measure over the bag, the sink, or a spare plate instead.
Rounding the figure too aggressively. 142.5 g is already a rounded figure; rounding it again to 142 g is fine for most cooking, but for delicate baking keep the full figure.
Scooping the cup straight from the bag or jar. This packs caster sugar down and can add 15–20% extra weight. Spoon it in loosely and level it off, or better, weigh it.
If you do not have a scale
For sticky or pourable caster sugar, lightly oil the measure first so it releases cleanly, and pour slowly so you can stop at the line.
Use a 3/4 cup measure if you have one. Fill it using the spooned and levelled method: spoon caster sugar in, do not press it down, and level the top with the back of a knife.
Four level tablespoons are roughly 3/4 cup of a cup — about 142.5 g of caster sugar. Tablespoons are easier to level accurately than a small cup, so this is a decent fallback.
Remember that any of these fallbacks is approximate. A kitchen scale is inexpensive, and it turns every conversion on this site — including this 142.5 g figure — from a good guess into a measurement you can trust.
Frequently asked questions
Should I sift caster sugar before measuring 3/4 cup?
Only if the recipe says to. Sifting adds air and lowers the weight per cup, so 3/4 cup of sifted caster sugar weighs less than 3/4 cup measured spooned and levelled. The 142.5 g figure here assumes caster sugar measured spooned and levelled, not sifted — unless your recipe explicitly says 'sifted'.
How many tablespoons is 3/4 cup of caster sugar?
3/4 cup of a cup is four tablespoons by volume. By weight that is about 142.5 g of caster sugar. Tablespoons are a useful fallback when you do not have a 3/4 cup measure, but weigh the result if you can, because a heaped tablespoon is not the same as a level one.
Why do different websites give different grams for 3/4 cup of caster sugar?
Because the full-cup figure differs between sources. King Arthur Baking lists 190 g per cup spooned and levelled, and other sources may scoop, pack or sift differently. Packing, brand and humidity all shift the true density a little, and different sources round their figures differently. The differences are usually small for 3/4 cup, but they explain why you see several figures online.
How do I measure 3/4 cup of caster sugar without a scale?
Use a 3/4 cup measure and the spooned and levelled method: spoon the caster sugar in loosely, level the top with a straight edge, and do not pack it down. Four level tablespoons are the same volume. Expect the result to be approximate, and use a scale for baking where precision matters.
What is the best way to store caster sugar so the conversion stays accurate?
Airtight container, cool and dry, indefinitely. Keeping caster sugar dry and settled matters, because clumping and moisture change how much fits in a cup — and therefore how much a cup weighs.