Why cups, grams and millilitres are not interchangeable
A recipe that says '1 cup' is describing volume, while a kitchen scale reads weight — and the relationship between the two changes completely depending on what you are measuring. One cup of honey weighs roughly 340g because honey is dense and sticky, while one cup of all-purpose flour weighs only around 120g when spooned lightly into the cup, because flour traps a lot of air.
This is the single biggest reason home bakers get inconsistent results between recipes written in cups (common in the US) and recipes written in grams (common almost everywhere else). This converter fixes that by applying an ingredient-specific density figure instead of a single generic conversion factor.
Spooned versus packed flour, and why it matters
Flour is a special case worth calling out separately: 'spooned and levelled' flour is scooped lightly with a spoon and levelled off with a knife, giving roughly 120g per cup, while 'packed' or scooped-and-shaken flour compresses more and can weigh up to 150g per cup. That is a 25% difference from technique alone, which is why baking recipes that care about precision — especially bread and pastry — almost always prefer weight over volume.
If you are unsure which method a recipe intended, spooned flour is the safer default for most modern recipes, and it is the option this tool uses unless you pick the packed variant.
How to get the most accurate conversion
Choose the ingredient that most closely matches what you are actually measuring — brown sugar, granulated sugar and powdered sugar all convert differently because their particle size changes how tightly they pack into a cup. If your exact ingredient is not listed, choose the closest match in texture and density rather than defaulting to a generic 'sugar' or 'flour' figure.
For the most accurate baking results overall, a digital kitchen scale is always better than any volume-to-weight conversion, including this one — density conversions are averages, and real ingredients vary by brand, freshness and humidity.
Frequently Asked Questions
Is a US cup the same as a UK or Australian cup?
No — a US cup is 240ml, while an Australian cup is 250ml and older UK recipes sometimes use an imperial cup of about 284ml. This tool uses the US cup standard, the most common in modern recipes.
Why do two 'cup of sugar' conversions give different gram values elsewhere?
Different sources use different assumed densities and cup sizes. This tool documents its exact grams-per-cup assumption for each ingredient in the table so you can judge whether it matches your recipe's origin.
Can I convert an ingredient that isn't in the list?
Pick the closest ingredient in the dropdown by texture — for example, treat desiccated coconut similarly to rolled oats — since exact per-ingredient data for every possible food is outside what a single calculator can hold accurately.
Does altitude or humidity affect these conversions?
Slightly — very humid conditions can make flour and sugar pack differently — but the effect is small enough that it rarely matters outside of professional baking environments.