Cooking Unit Converter

The Complete Guide to Cooking Measurement Conversions

If you've ever tried to follow a recipe from another country and ended up with a cake that didn't rise, bread that was too dense or cookies that spread too thin, the culprit was almost certainly a measurement conversion error. Cooking and baking use two fundamentally different measurement systems — and they don't speak the same language.

This guide explains everything: why cups and grams aren't interchangeable with a single number, why your UK cup is bigger than your US cup, why fan ovens run hotter than stated, and how to convert any recipe measurement accurately every time.

Volume vs weight: the core tension in recipe conversions

The USA and much of the English-speaking world measure dry ingredients by volume — cups, tablespoons and teaspoons. Most of Europe, and professional kitchens everywhere, measure by weight — grams and kilograms. Both systems work well on their own, but converting between them requires one crucial piece of information that most online converters ignore completely: the density of the ingredient.

A cup is a measure of volume — it holds the same amount of space regardless of what's inside it. But how much that space weighs depends entirely on what you put in it. Consider these 1-cup measurements side by side:

• 1 cup of all-purpose flour = 125 grams
• 1 cup of granulated sugar = 200 grams
• 1 cup of honey = 340 grams
• 1 cup of cocoa powder = 85 grams
• 1 cup of water = 240 grams

That's a nearly 4:1 difference between cocoa powder and honey — in the same measuring cup. Any converter that uses a single "1 cup = 240 g" rule is giving you completely wrong results for most dry ingredients. This is the single biggest source of baking failures when converting recipes.

Why different cups produce different results

To complicate matters further, a "cup" is not a universal measurement. Three different cup standards are in active use around the world, and the difference between them is significant enough to ruin baked goods:

• US customary cup = 236.588 ml (the most common in recipes from the USA and most YouTube/TikTok cooking content)
• Australian cup = 250 ml (used in Australian and many Asian recipe sources)
• UK imperial cup = 284.131 ml (used in older British cookbooks — not commonly used in modern UK recipes, which prefer metric weights)

The difference between a US cup and a UK cup is approximately 20% — meaning that if you use a UK cup in a recipe calling for 2 US cups of flour, you're adding nearly 80 grams more flour than intended. That's enough to turn a light sponge into a dry brick.

When following online recipes, always check the origin. US cooking influencers use US cups, Australian food bloggers use Australian cups, and British recipe books almost always use grams and millilitres (which are unambiguous and far more accurate).

Understanding tablespoons and teaspoons internationally

The tablespoon also varies internationally, though by smaller amounts:

• US tablespoon = 14.787 ml (16 tablespoons per cup)
• UK tablespoon = 17.758 ml
• Australian tablespoon = 20 ml (4 teaspoons, not 3)
• Metric tablespoon = 15 ml

The Australian tablespoon is particularly notorious for causing confusion — it contains 4 teaspoons, not 3 as in US/UK usage. If you're following an Australian recipe and using a US tablespoon, you're under-measuring by 25% with every tablespoon.

For small amounts like leaveners (baking powder, baking soda), this difference matters enormously. Over-measuring baking powder by 25% can cause your cake to rise too quickly, collapse, and taste bitter. Teaspoon measurements, fortunately, are far more consistent internationally (approximately 5 ml everywhere except the UK's 5.9 ml).

Oven temperatures: why your baking always burns (or doesn't cook)

Temperature conversion is the other major source of international recipe disasters. American recipes use Fahrenheit (°F), while the rest of the world uses Celsius (°C). The conversion formula is:

°C = (°F − 32) × 5/9 and °F = (°C × 9/5) + 32

So the ubiquitous "350°F" in American baking becomes 177°C — often rounded to 180°C in metric recipes. A 425°F roasting temperature is 218°C.

The fan oven (also called convection oven) adjustment is the one most home bakers forget. Fan ovens circulate hot air, cooking food faster and more evenly — but also running hotter than their display temperature suggests. The standard adjustment is to reduce the stated temperature by 20°C (35°F) when switching from a conventional oven. So if a recipe says 180°C conventional, use 160°C on a fan oven. Many burnt cakes and over-baked biscuits are the direct result of ignoring this adjustment.

How to scale a recipe accurately

Scaling a recipe up or down is mathematically straightforward — multiply every ingredient by your desired factor — but several practical considerations apply:

• Baking time doesn't scale linearly. Doubling a cake recipe doesn't mean doubling the baking time. A larger cake needs more time, but usually only 20–30% more. Check for doneness with a toothpick rather than relying solely on the stated time.
• Pan size matters. When scaling up, use a larger pan or multiple pans rather than a deeper pour in the original tin. Batter depth affects cooking time significantly.
• Leaveners should be scaled carefully. Baking powder and baking soda quantities don't always scale perfectly — too much causes a metallic taste and over-rising. When scaling up by 3× or 4×, use slightly less than the mathematically correct amount.
• Salt and spices can be scaled slightly below the multiplier. Flavour intensity doesn't scale linearly at larger quantities — a recipe scaled to 4× rarely needs exactly 4× the salt.

Why weighing is always more accurate than measuring by volume

Professional bakers and pastry chefs universally use weight measurements, not volume — and for good reason. Volume measurements introduce significant variability that weight measurements eliminate entirely:

• Flour can vary by 20–30% depending on whether it's scooped, spooned or sifted. A densely packed cup of flour weighs around 150–160 g; a lightly spooned cup weighs around 110–120 g. A kitchen scale removes this variable completely.
• Humidity affects dry ingredients. Flour absorbs moisture from the air, making it heavier per cup in humid climates. Weight-based measurements are unaffected.
• Fewer dishes to wash. You can weigh every ingredient directly into your mixing bowl, zeroing the scale between additions — no measuring cups, no spoons, no cleanup.

The recommendation from every serious baker: invest in a digital kitchen scale (accurate to 1 gram), and use this converter to find the gram equivalents for your favourite volume-based recipes once — then write them in the margin of your cookbook and weigh forever after.

Frequently asked questions