Cooking & Baking Converters

The Australian Cooking Conversion Problem

Here's the thing: if you follow an American recipe in Australia without converting, your cake will be too wet. Your sauce will be too thick. Your cookies will spread. This isn't a rounding error. The Australian tablespoon is 20 millilitres. The American tablespoon is 15 millilitres. The Australian cup is 250 millilitres. The American cup is 236.6 millilitres. These differences compound through a recipe and change the final result.

Most Australian cooks don't think about this because we follow Australian recipes. But if you're using online recipes, following food blogs written overseas, or scaling a recipe from an imported cookbook, you need to understand what you're actually measuring. A recipe that works perfectly in Los Angeles might fail spectacularly in Sydney unless you convert the measurements correctly.

The Australian tablespoon: 20ml, not 15ml

This is the single most important conversion for Australian cooks. When an American recipe says 2 tablespoons of butter, they mean 30 millilitres. When an Australian recipe says 2 tablespoons, it means 40 millilitres. Double-check your recipe source. If it's from an American food blog, you're getting less fat than intended.

The practical impact: if a recipe is supposed to have 4 tablespoons of oil and you use 80 millilitres instead of 60 millilitres, you're adding about 33 percent more oil. Your dressing will be greasy. Your cake will be oily. This matters. If you're converting American recipes, divide the tablespoons by 1.33 or convert to millilitres and then to Australian tablespoons.

The Australian cup: 250ml, not 240ml

The difference is small, but it adds up over multiple cups. An American recipe calling for 3 cups of flour is roughly 360 millilitres. Three Australian cups is 750 millilitres. That's more than double. A lot of American online recipes actually mean 240 millilitres per cup (not 236.6), which is close to 1 cup in metric terms (250 millilitres).

The practical scenario: you're following a cake recipe that calls for 2 cups of sugar. If you measure 2 American cups (about 475 millilitres) instead of 2 Australian cups (500 millilitres), you're only slightly short. But the ratio of sugar to other ingredients shifts, and the cake might be less sweet or have a different texture. For baking especially, precision matters.

Teaspoons and smaller measurements

Teaspoons are more consistent across systems. An American teaspoon is 5 millilitres, and an Australian teaspoon is also 5 millilitres. The difference is negligible. Where Australians sometimes diverge is in the dessertspoon (10 millilitres), which is used in older Australian recipes but rarely seen in American cooking. If you see a dessertspoon in a vintage recipe, that's half a tablespoon in modern Australian measurements (10 millilitres, or about 0.5 of an Australian tablespoon).

Practical conversion rules for different recipe types

For baking, precision is critical. By weight is always more accurate than by volume. If an American recipe lists weights in ounces or grams, use those instead of cups and tablespoons. If you have to use volume, convert everything to millilitres first, then calculate Australian equivalents. A cup of flour is roughly 130 to 150 grams depending on how compacted it is, so weighing is more reliable than measuring.

For cooking and sauces, the difference is less critical. If a recipe calls for 1 tablespoon of soy sauce, the difference between 15 millilitres and 20 millilitres is barely noticeable. But if a recipe calls for 4 tablespoons of oil or butter, that extra 20 millilitres per tablespoon adds up quickly. Be more careful with fat than with seasonings.

Why this matters so much in Australia

Australia is officially metric. Your supermarket measures flour in grams. Your recipe websites all assume metric. But American food blogs, American cooking shows, and American cookbooks are everywhere online. Most Australians don't notice the conversion issue because they look for Australian recipes. But the moment you follow an imported recipe, you're swimming against the current if you don't convert.

Quick reference for the most common conversions

1 American cup is about 240 millilitres. 1 Australian cup is 250 millilitres. 1 American tablespoon is 15 millilitres. 1 Australian tablespoon is 20 millilitres. 1 teaspoon is 5 millilitres everywhere. 1 fluid ounce is 30 millilitres (roughly). If a recipe is American and you're cooking in Australia, convert cups and tablespoons before you start. If a recipe is Australian and the source is Australian, don't overthink it.