How many grams in a cup of oil?

A cup of vegetable oil, olive oil, or coconut oil weighs approximately 216–218g — lighter than water because oils are less dense than water (which is why oil floats). All common cooking oils are very close in weight per cup.

How many grams in a cup of maple syrup?

A cup of maple syrup weighs approximately 322g — heavier than water but lighter than honey, because maple syrup has a lower sugar concentration than honey.

How many grams in a cup of double cream (heavy cream)?

A cup of double cream (heavy whipping cream) weighs approximately 238g — slightly less than milk because of its higher fat content. Fat is less dense than the water component of dairy, pulling the weight down slightly.

Is 1 cup always 240ml?

In the US, yes — the standard cup is 240ml. In Australia it's 250ml, and in the UK cups aren't a standard unit (British recipes use weight in grams). For water-like liquids, 240ml = 240g. For denser liquids like honey or syrup, 240ml weighs significantly more than 240g.

Grams in a Cup
of Liquid.
Not all 240g.

Q: How many grams in a cup of water?

A cup of water weighs exactly 240g (using the US cup of 240ml). Water is the baseline — 1ml of water = 1g. Every other liquid deviates from this depending on its density.

Q: How many grams in a cup of milk?

A cup of whole milk weighs approximately 242g — very close to water because milk is mostly water. Skimmed milk is slightly lighter at around 240g, while full-fat milk sits at 242–245g.

Q: How many grams in a cup of honey?

A cup of honey weighs approximately 340g — significantly heavier than water because honey is very dense. This is why recipes that substitute honey for sugar need to reduce the liquid elsewhere: honey brings a lot of extra weight and moisture.

Q: Why does oil weigh less than water per cup?

Oil is less dense than water — its molecules are larger and pack more loosely. This is why oil floats on water. A cup of oil occupies the same volume as a cup of water, but contains less mass: roughly 216–218g versus 240g for water.

Water is 240g per cup. Honey is 340g. Oil is 218g. Every baking liquid has a different weight — and getting it wrong when you're scaling a recipe throws everything off.

Water · Milk · Cream Honey · Syrups · Oils ml ↔ g Explained 20+ Liquids

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Based on a US cup (240ml). Australian cup = 250ml; multiply results by 1.042 for AU recipes.

Quick-Glance Reference

The most common baking liquids — bookmark this section.

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Heaviest to Lightest

The same 1-cup volume — but wildly different weights. This is why volume and weight aren't the same thing.

Grams per 1 US cup (240ml) — sorted heaviest to lightest

The Hidden Traps

Two mistakes that catch even experienced bakers out.

⚠️ Fluid Ounces ≠ Weight Ounces — Not Even Close for Liquids

240g

8 fl oz water

≠

272g

8 fl oz honey

A fluid ounce measures volume — it's always 29.57ml regardless of what's in it. A weight ounce measures mass — and varies completely by liquid density. For water they're almost equivalent (1 fl oz ≈ 29.6g). For honey, 1 fl oz weighs about 42g. For oil, about 27g.

When an American recipe says "8 fl oz of honey", they mean a volume of 8 fl oz — which weighs around 340g, not 227g (which is what 8 weight ounces of honey would be). Always clarify which ounce a recipe means if it's ambiguous.

⚠️ Honey and Molasses Are Much Heavier Than Sugar

200g

1 cup caster sugar

340g

1 cup honey

Recipes that substitute honey for sugar need to account for the extra weight and the extra moisture honey brings. The standard substitution is: use ¾ cup (255g) of honey for every 1 cup (200g) of sugar, reduce other liquids in the recipe by 60ml, and add ¼ tsp bicarbonate of soda to neutralise the acidity.

Molasses follows the same logic — it's similarly dense (about 340g per cup) and highly acidic. Never substitute it for sugar by volume without adjusting the rest of the recipe.

💡 ml and grams: when they're the same, when they're not

For water: 1ml = 1g exactly. This is how the gram was originally defined.

For milk, buttermilk, most dairy liquids: very close to 1ml = 1g — within 1–2%. Safe to treat them as equivalent for most baking.

For oils: 1ml ≈ 0.91g — oil is less dense than water, so 240ml of oil weighs about 218g, not 240g.

For honey, syrups, molasses: 1ml ≈ 1.4g — these are much denser than water. 240ml of honey weighs around 340g.

Full Conversion Tables

All common baking liquids, in every useful measurement.

Water, Milk & Dairy

Liquid	¼ cup	½ cup	1 cup	g per cup
Water	60g	120g	240g	240g
Whole milk	61g	121g	242g	242g
Semi-skimmed milk	60g	120g	240g	240g
Skimmed milk	60g	120g	240g	240g
Buttermilk	61g	121g	242g	242g
Double cream (heavy cream)	60g	119g	238g	238g
Single cream	60g	120g	240g	240g
Soured cream	61g	121g	242g	242g
Full-fat coconut milk	60g	120g	240g	240g
Oat milk	60g	120g	240g	240g
Almond milk	60g	120g	240g	240g
Condensed milk	78g	156g	312g	312g

Oils & Fats

Liquid	¼ cup	½ cup	1 cup	g per cup
Vegetable oil	55g	109g	218g	218g
Sunflower oil	55g	109g	218g	218g
Olive oil	54g	108g	216g	216g
Coconut oil (melted)	55g	109g	218g	218g
Rapeseed oil	55g	109g	218g	218g
Ghee (melted)	55g	110g	220g	220g
Melted butter	57g	114g	227g	227g

Honey, Syrups & Sweeteners

Liquid	¼ cup	½ cup	1 cup	g per cup
Honey	85g	170g	340g	340g
Maple syrup	81g	161g	322g	322g
Golden syrup	88g	176g	352g	352g
Black treacle (molasses)	85g	170g	340g	340g
Agave syrup	84g	168g	336g	336g
Rice syrup	82g	164g	328g	328g
Corn syrup	84g	168g	336g	336g

Other Baking Liquids

Liquid	¼ cup	½ cup	1 cup	g per cup
Vanilla extract	52g	104g	208g	208g
Lemon juice	61g	122g	244g	244g
Apple cider vinegar	60g	120g	240g	240g
Yogurt (full-fat)	61g	122g	245g	245g
Soured cream	61g	121g	242g	242g
Tahini	60g	120g	240g	240g

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Common Questions

How many grams in a cup of water?

Exactly 240g — a US cup is 240ml, and water weighs 1g per ml. This is the baseline everything else is measured against.

How many grams in a cup of milk?

Approximately 242g for whole milk — very close to water because milk is mostly water. Skimmed milk is ~240g, condensed milk is ~312g.

How many grams in a cup of honey?

340g — significantly more than water. Honey is very dense: ~1.4g per ml. This is why a cup of honey weighs 42% more than a cup of water despite occupying the same volume.

Why does oil weigh less than water per cup?

Oil is less dense than water (density ~0.91g/ml vs 1g/ml for water). This is why oil floats on water. A cup of vegetable or olive oil weighs around 216–218g, not 240g.

Is 1ml of liquid always 1 gram?

Only for water. For milk and most dairy it's very close (within 1–2%). For oils it's about 0.91g per ml. For honey and syrups it's around 1.4g per ml. The gram-per-ml relationship only holds exactly for water at 4°C — everything else deviates based on density.

What's the difference between a US cup and a UK cup?

The US cup is 240ml. The Australian cup is 250ml. The UK doesn't have a standardised cup measurement — British recipes use grams. All weights on this page are based on the US cup (240ml). For Australian recipes, multiply gram results by 1.042.

Grams in a Cupof Liquid.Not all 240g.