45 Grams of Flour to Cups
⅜ cup in a US cup — and what that looks like with a measuring spoon
45 grams of all-purpose flour is ⅜ cup in a US cup. In the kitchen that is ¼ cup, 1 tablespoon plus 2¼ teaspoons.
Grams weigh and cups fill, so the answer only exists once you say what is in the cup. A US cup of all-purpose flour weighs 125 g, and every figure on this page comes from that one number.
It also depends on whose cup you mean. In a 250 ml metric cup — the standard in the UK, Australia, New Zealand and Canada — 45 g of all-purpose flour is ⅓ cup, because that cup holds about 5.7% more than the 236.6 ml US cup.
Round to the nearest measure in a standard cup set — ¼ cup — and you are 14 g under, about 31% of the amount.
45 g of flour in each cup standard
| Cup standard | Size | Grams per cup | Cups |
|---|---|---|---|
| US customary | 236.6 ml | 125 g | ⅜ |
| Metric (UK, AU, NZ, CA) | 250 ml | 132 g | ⅓ |
| Imperial (older UK) | 284 ml | 150 g | ⅓ |
A recipe that says "cups" without saying which one is almost always American. If it came from a British, Australian or New Zealand source, use the metric row.
How to measure 45 g of flour without scales
Spoon the flour into the cup and sweep it level with a knife. Dragging the cup through the bag compacts it, and that cup weighs 140–150 g instead of 125 g — up to 20% more flour than the recipe wanted.
This is plain all-purpose flour. Bread flour packs slightly heavier at 130 g per cup and cake flour lighter at 100 g, so a recipe written for one is not a straight swap by volume.
- Build it as ¼ cup, 1 tablespoon plus 2¼ teaspoons rather than guessing at ⅜ of a cup.
- 45 g is 5.76 tablespoons of all-purpose flour, at 7.81 g per tablespoon.
- A digital scale removes the question entirely, and costs less than the ingredients it saves.
Nearby amounts of flour
| Grams | US cups | Metric cups | Tablespoons |
|---|---|---|---|
| 25 g | ¼ | 0.19 | 3.2 |
| 30 g | ¼ | ¼ | 3.84 |
| 35 g | ¼ | ¼ | 4.48 |
| 40 g | ⅓ | ⅓ | 5.12 |
| 50 g | ⅜ | ⅜ | 6.4 |
| 55 g | ½ | ⅜ | 7.04 |
| 60 g | ½ | ½ | 7.68 |
| 65 g | ½ | ½ | 8.32 |
45 g of something else
The same 45 g is a different number of cups for every ingredient, because they do not weigh the same for their size.
| Ingredient | Grams per US cup | US cups |
|---|---|---|
| Sugar | 200 g | ¼ |
| Butter | 227 g | ¼ |
| Water | 237 g | 0.19 |
45 grams in other units
| Unit | Amount |
|---|---|
| US cups | ⅜ |
| Tablespoons | 5.76 |
| Teaspoons | 17.28 |
| Ounces (weight) | 1.59 oz |
| Pounds | 0.10 lb |
| Millilitres (volume it fills) | 85 ml |
Frequently asked questions
How many cups is 45 grams of flour?
45 grams of all-purpose flour is ⅜ cup in a US cup, based on 125 g per cup. A 250 ml metric cup gives ⅓ cup.
What is the easiest way to measure 45 g of flour?
¼ cup, 1 tablespoon plus 2¼ teaspoons — built from a standard cup and spoon set. Spoon the flour into the cup and sweep it level with a knife. Dragging the cup through the bag compacts it, and that cup weighs 140–150 g instead of 125 g — up to 20% more flour than the recipe wanted.
Is 45 g of flour the same in cups in the UK?
No. A UK, Australian, New Zealand or Canadian metric cup is 250 ml against the US cup's 236.6 ml, so 45 g of all-purpose flour is ⅓ cup there and ⅜ cup in the US.
Can I just use ¼ cup instead?
¼ cup of all-purpose flour weighs about 31 g, so you would be 14 g under. For a sauce or a soup that is fine; for a cake, where the flour-to-liquid ratio sets the crumb, weigh it.
How many ounces is 45 grams?
45 grams is 1.59 ounces by weight. Unlike cups, that answer is the same whatever you are measuring — ounces weigh, fluid ounces fill, and they are not the same unit.