Converting Recipes Without the Guesswork
Cups, grams, spoons and oven dials — why recipes from different countries don’t line up, and how to convert them so your bake turns out the way the author intended.
Why a “cup” isn’t one thing
A US customary cup holds 236.6 mL. Australia, New Zealand, Canada and South Africa generally use a rounded metric cup of 250 mL, and older British cookbooks sometimes refer to a breakfast cup of around 284 mL (half an imperial pint). The gap between a US and a metric cup is only about 6%, which rarely matters for a soup but can make a delicate sponge noticeably drier or wetter when it is multiplied across several cups of flour and liquid.
The easiest rule: use measuring cups from the same country as the recipe. If you cannot, convert liquids by volume (millilitres) and convert dry ingredients by weight (grams), using the table further down this page.
Weigh dry ingredients — here’s why
Volume measures how much space an ingredient takes up, not how much of it there is. Flour is the classic problem: scoop a cup straight from a compacted bag and you can get 150 g; spoon it loosely into the cup and level it with a knife and you get around 120 g. That 25% swing is the most common reason a recipe “didn’t work”.
A basic digital kitchen scale removes that variable entirely. Most professional and European recipes are written in grams for exactly this reason. Liquids are different — water, milk and stock weigh close to 1 g per mL, so measuring them by volume is reliable. Sticky liquids like honey are the exception: a cup of honey weighs about 40% more than a cup of water.
1 US cup in grams, by ingredient
| Ingredient | 1 cup ≈ | Note |
|---|---|---|
| All-purpose flour (spooned & levelled) | 120–125 g | Scooped straight from the bag it can reach 150 g. |
| Bread flour | 127 g | Slightly denser than all-purpose. |
| Granulated (white) sugar | 200 g | Fairly consistent because the crystals pack evenly. |
| Brown sugar (packed) | 210–220 g | US recipes almost always mean “firmly packed”. |
| Powdered / icing sugar | 120 g | Sift first if the recipe says “sifted”. |
| Butter | 227 g | One US stick = ½ cup = 113 g = 8 tablespoons. |
| Rolled oats | 90 g | Very light for their volume. |
| Uncooked white rice | 185–200 g | Long-grain is a little lighter than short-grain. |
| Honey or maple syrup | 320–340 g | Much heavier than water — 1 cup of water is ~237 g. |
| Whole milk | 240–245 g | Close to water, so volume works fine for liquids. |
Values are typical averages; brands and humidity vary. When a recipe gives grams, trust the grams.
Spoons and small measures
| Measure | Volume | Good to know |
|---|---|---|
| 1 teaspoon (US) | 4.93 mL | Metric teaspoon is 5 mL — the difference is negligible. |
| 1 tablespoon (US) | 14.79 mL | 3 teaspoons. Metric tablespoon is 15 mL. |
| 1 tablespoon (Australia) | 20 mL | Equals 4 teaspoons — matters for baking powder and salt. |
| 1 US fluid ounce | 29.57 mL | 2 tablespoons. |
| ¼ US cup | 59 mL | 4 tablespoons. |
| 1 US cup | 236.6 mL | 16 tablespoons. Metric cup is 250 mL; UK legacy cup ~284 mL. |
Leavening agents and salt are where spoon size matters most. An Australian tablespoon of baking soda is a third larger than an American one — enough to leave a soapy taste. If a recipe is Australian, use 4 US teaspoons wherever it says 1 tablespoon.
Oven temperatures: °F, °C and gas mark
| °F | °C | Gas | Typical use |
|---|---|---|---|
| 250°F | 120°C | ½ | Meringues, drying, very slow roasting |
| 300°F | 150°C | 2 | Slow-baked custards and cheesecake |
| 325°F | 160°C | 3 | Rich fruit cakes, braises |
| 350°F | 180°C | 4 | Most cakes, cookies and casseroles |
| 375°F | 190°C | 5 | Muffins, pies, roast vegetables |
| 400°F | 200°C | 6 | Bread rolls, roast potatoes |
| 425°F | 220°C | 7 | Pizza, puff pastry, crisping |
| 450°F | 230°C | 8 | Artisan bread, high-heat roasting |
Recipes round Celsius to the nearest 10 degrees, so 350°F becomes 180°C rather than the exact 176.7°C. That is fine — home ovens commonly drift 10–15 degrees from what the dial says, which is a bigger error than the rounding. An inexpensive oven thermometer is the best upgrade for consistent baking.
Fan (convection) ovens cook faster because moving air transfers heat more efficiently. Many European recipes list a separate “fan” temperature about 20°C lower than the conventional one. If a recipe gives only a conventional temperature and you use fan, reduce by around 20°C (25°F) or check for doneness earlier.
A worked example
Suppose an American cookie recipe calls for 2¼ cups of flour, 1 cup of packed brown sugar, 1 cup (2 sticks) of butter and an oven at 375°F. Converting for a metric kitchen:
- Flour: 2.25 × 125 g ≈ 280 g
- Brown sugar: 1 × 215 g ≈ 215 g
- Butter: 2 sticks × 113 g = 226 g
- Oven: 375°F ≈ 190°C (170°C fan)
Notice that only the liquid-style measures could be converted with a simple volume factor — everything dry needed an ingredient-specific weight. For plain liquids, the liquid volume converter gives exact millilitres, and the ounce guide explains why “8 ounces” of flour and “8 fluid ounces” of milk are not the same thing.