Grams to Cups: The Honest Baking Conversion Chart

A cup of flour weighs anywhere from 120g to 150g depending on who scooped it. That is the problem no conversion chart likes to admit: grams measure weight, cups measure volume, and baking ingredients refuse to settle into a cup the same way twice. We weigh everything here — every test bake of every cutter design runs over a digital scale — but half the recipes on the internet speak in cups, and plenty of our customers bake in kitchens where a scale is not standard kit. So this is the grams to cups conversion for baking that we actually use: per-ingredient charts, honest ranges where honest ranges exist, and a straight answer on the three ingredients where cup measures will genuinely ruin your biscuits.

Why cups and grams will never quite agree

A gram of flour is a gram of flour in London, Toronto or Sydney. A cup is a looser promise, for three reasons.

• Density. A cup of icing sugar weighs about 125g; a cup of golden syrup weighs 340g. Same cup, nearly three times the weight, so there is no single magic multiplier and every ingredient needs its own row.
• Technique. Scoop the cup straight into the flour bag and you compress the flour: 140–150g. Spoon flour into the cup and level it with a knife: 120–125g. Same cup, same flour, up to 25% more of it — enough to change a dough completely.
• The cup itself. A US cup is 240ml. The metric cup used in Australia, New Zealand and many Canadian recipes is 250ml. The old British imperial cup was 284ml. And an Australian tablespoon is 20ml where everyone else's is 15ml, a detail that has quietly wrecked more recipes than any oven.

Every chart below uses the 240ml US cup and the spoon-and-level method, because that is what most American recipe writers mean. Following an Australian recipe with Australian cups? Add roughly 4% to the gram figures and carry on.

The grams to cups conversion charts for baking

Figures are for one level cup, spooned and levelled, rounded to the nearest 5g wherever the rounding does no harm.

Flour and other powders

Sugars

Note the two icing sugar rows. It compacts in the bag, so sifting changes the number by a fifth. More on that below, because it matters more than it looks.

Butter, fats and liquids

American butter has one genuine advantage: the sticks are printed with tablespoon markings, so ½ cup of butter is simply one stick and no cup is involved. If your butter comes in an unmarked block, weigh it.

Syrups

Syrups are the one place volume behaves, because liquids do not compress. They are also the one place cups are genuinely miserable, since scraping golden syrup out of a measuring cup is a job you volunteer for once. Weigh it straight into the mixing bowl and keep your dignity.

The three ingredients where cups ruin biscuits

Most of the conversions above land close enough for a forgiving recipe. These three do not — and they happen to be the three that decide whether a cut-out biscuit keeps its shape or bakes into a blob.

1. Flour

Flour is the structure. Dough for shaped biscuits needs to sit on the firm side, and a 25g shortfall — one casually filled cup versus one properly spooned one — gives you dough that spreads in the oven, rounding off every point, paw and fin the cutter put there. A 25g excess goes the other way: dry dough, cracked edges, biscuits that snap when you lift them off the tray. If your shapes keep blurring, flour measured by cup is suspect number one; why do my cookies spread walks through the full line-up of culprits, and our cut-out dough recipe is written in grams for exactly this reason.

2. Icing sugar

Icing sugar compacts on the shelf, in the bag and on the drive home. A cup can hold 100g of freshly sifted sugar or 140g out of a squashed bag, and royal icing punishes that swing without mercy. Consistency is a ratio of sugar to liquid measured in seconds, and 20g of sugar either way is the difference between icing that floods out glassy and icing that slumps over the edge of the biscuit. If you decorate, weigh the icing sugar every time — our royal icing consistency guide assumes you do.

3. Brown sugar

“Packed” is an instruction, not a unit. A cup of soft brown sugar loosely tumbled in is about 150g; honestly packed, 200g; packed by someone taking the word personally, 240g. That is a 60% range on the ingredient that carries moisture into the dough, and more brown sugar means flatter, wetter, chewier biscuits — lovely in a drop cookie, fatal to a crisp cut-out. For shaped biscuits we keep brown sugar modest and always weighed; when a recipe says packed, 200g per cup is the fairest reading.

Converting a recipe you already trust

One honest caveat first: if a cup-based recipe already works for you, do not convert it. Your cups, your scooping habits and that recipe have calibrated themselves to each other through repetition, and switching to someone else's gram figures can break something that was never broken. Convert the recipes that are letting you down, not the ones that are not.

When you do convert, do it once and write it down.

1. Measure a cup of flour exactly the way you always do, then weigh it. That number — not 125g — is what your recipe has really been getting all along.
2. Convert the whole recipe in one sitting using the charts above and pencil the grams into the margin.
3. Bake it twice by weight before you judge it. The first bake tells you whether it is close; the second tells you whether it is repeatable.

A flat digital scale with a tare button costs less than a bag of good chocolate chips and removes the entire argument. It will not fix an oven that lies, though — most of our test bakes run at 170°C (340°F) for 10–12 minutes, and a cheap oven thermometer has settled more of the recipe-must-be-wrong disputes than we can count.

Our house rule: weigh anything that can compress, trust the cup only for what pours, and never believe a cup of flour you did not fill yourself.

Once the dough is weighed and behaving, the cutters are our department — the full range is in the shop.