Convert grams to ml instantly.
Grams to ml converter
Weight to volume, by ingredient
100 g of water is
Using 1.00 g/ml.
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Recent conversions
Density unit
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If you've ever stood in the kitchen holding a recipe that says "120g of flour" with nothing but a measuring jug in your hand, you already know the problem: grams and millilitres aren't the same thing, and they never convert at a fixed rate. Above, our grams to ml converter does the maths instantly for 59 ingredients, 25 density units and pretty much anything else you can throw a custom density at. Below, we'll walk through exactly how to use it, why the conversion isn't as simple as most people assume, and where the numbers actually come from.
On this page
- How to use the grams to ml converter
- Why grams and millilitres aren't the same
- Grams to ml conversion chart
- Same weight, different volume (chart)
- Quick conversions for common amounts
- UK vs US measurements
- Getting accurate results every time
- Frequently asked questions
- Add this calculator to your website
How to use the grams to ml converter
The calculator at the top of this page looks simple, but there's more packed into it than a typical converter, so here's what each part actually does.
- Pick a direction. The two tabs at the top switch which way the maths runs. "Grams to ml" takes a weight and tells you the volume; "ml to grams" does the reverse. Both use exactly the same density behind the scenes, so you'll get the same answer either way round.
- Choose an ingredient. Tap the ingredient box to open the picker. There are 59 options split into groups — liquids and dairy, butters and syrups, flours and powders, sugars and grains — each with a density already filled in. If your ingredient isn't listed, pick Custom density at the very top of the list and type your own figure.
- Check or change the density unit. Next to the density box is a small unit button (it starts on g/mL). Tap it to switch between 25 units — metric ones like kg/m³ and g/L, imperial ones like lb/ft³ and oz/US gal, or kitchen-friendly ones like g/tsp. Handy if the density you found online is written in a unit the tool doesn't show by default.
- Type your amount and hit Convert. Enter the weight (or volume) you've got, press Convert, and watch the jug fill to the right level. The big number is your answer, and underneath it you'll find the same amount expressed as cups, tablespoons, teaspoons, fluid ounces, litres, ounces, pounds and kilograms — no extra taps needed.
- Explore "More units" if you need something unusual. The gold cell at the bottom of the results opens a list of 51 further units, from cubic yards and US oil barrels to grains and sticks of butter. It's there for the odd occasion a recipe or a spec sheet asks for something the main six units don't cover.
- Check your recent conversions. The clock icon in the top corner keeps a short history of what you've converted, so if you're working through a recipe with several ingredients you can jump back to an earlier one without re-typing it.
Worth knowing: every ingredient in the list has a genuine density value behind it — not a rough guess. We cross-checked the common ones (flour, sugar, butter, honey) against baking reference charts, and the unit conversions themselves (litres, cups, ounces, pounds and so on) are calculated from the exact legal definitions of those units, not rounded estimates. If a number looks slightly different from another site you've used, it's usually because that site is using a different assumption for how the ingredient was measured (spooned versus scooped, for instance) — not because either tool is "wrong".
Why grams and millilitres aren't the same
This trips up more people than it should, so it's worth spelling out properly. A gram measures weight — how heavy something is. A millilitre measures volume — how much space something takes up. Those are two completely different properties, and the only thing that connects them is density: how tightly packed the substance is.
Water happens to have a density of almost exactly 1 gram per millilitre, which is where the myth that "1g always equals 1ml" comes from. It's true for water (and things that are mostly water, like milk or stock), but it falls apart the moment you weigh something lighter or heavier. A gram of feathers and a gram of lead weigh the same — obviously — but the feathers take up a lot more room. Flour and honey are the kitchen version of that same idea: flour is full of air pockets and is much lighter than water for its size, while honey is thick and dense and packs a lot of weight into a small space.
The formula behind every conversion on this page is:
Volume (ml) = Weight (g) ÷ Density (g/ml)
Weight (g) = Volume (ml) × Density (g/ml)
So for 100g of honey, at a density of 1.42 g/ml, you divide 100 by 1.42 and get roughly 70ml — nowhere near the 100ml you'd expect if you assumed grams and millilitres were interchangeable. That's the entire reason a "grams to ml converter" needs to know what you're converting, not just how much of it.
Grams to ml conversion chart
Here's how 100g of some of the most commonly searched kitchen ingredients works out in millilitres, using the same density figures the calculator above uses. If your amount isn't 100g, just scale it — or use the calculator, which does this instantly for any weight.
| Ingredient | Density (g/ml) | 100g in ml |
|---|---|---|
| Water | 1.00 | 100.0 ml |
| Whole milk | 1.03 | 97.1 ml |
| Double cream | 1.00 | 100.0 ml |
| Natural yoghurt | 1.03 | 97.1 ml |
| Plain flour | 0.53 | 188.7 ml |
| Self-raising flour | 0.53 | 188.7 ml |
| Granulated sugar | 0.85 | 117.6 ml |
| Caster sugar | 0.95 | 105.3 ml |
| Icing sugar | 0.56 | 178.6 ml |
| Honey | 1.42 | 70.4 ml |
| Golden syrup | 1.44 | 69.4 ml |
| Maple syrup | 1.32 | 75.8 ml |
| Melted butter | 0.91 | 109.9 ml |
| Vegetable oil | 0.92 | 108.7 ml |
| Olive oil | 0.91 | 109.9 ml |
| Cocoa powder | 0.42 | 238.1 ml |
| Rice (uncooked) | 0.85 | 117.6 ml |
| Table salt | 1.20 | 83.3 ml |
Notice how wide the spread is — 100g of cocoa powder takes up more than three times the volume of 100g of golden syrup. That's density doing all the work, and it's exactly why "just eyeball it" doesn't hold up for baking.
Same weight, different volume
This chart shows the same 100g figure from the table above, but laid out side by side so you can see the size difference at a glance. Flour towers over honey even though they weigh exactly the same.
Volume taken up by 100g of each ingredient. Same weight on the kitchen scale, very different amounts in the jug.
Quick conversions for common amounts
These are the amounts people tend to search for mid-recipe. All figures are rounded to one decimal place.
| Amount | Water | Plain flour | Granulated sugar | Honey |
|---|---|---|---|---|
| 50g | 50.0 ml | 94.3 ml | 58.8 ml | 35.2 ml |
| 100g | 100.0 ml | 188.7 ml | 117.6 ml | 70.4 ml |
| 150g | 150.0 ml | 283.0 ml | 176.5 ml | 105.6 ml |
| 200g | 200.0 ml | 377.4 ml | 235.3 ml | 140.8 ml |
| 250g | 250.0 ml | 471.7 ml | 294.1 ml | 176.1 ml |
| 500g | 500.0 ml | 943.4 ml | 588.2 ml | 352.1 ml |
Need a different ingredient or an amount that isn't on this list? That's exactly what the calculator at the top of the page is for — it covers all 59 ingredients at any amount, not just the handful above.
UK vs US measurements
One extra wrinkle for anyone following recipes from different countries: a "tablespoon" or a "cup" doesn't mean the same volume everywhere. This is a common source of baking that goes slightly wrong, so it's worth knowing the actual numbers rather than assuming they match.
| Unit | UK / metric | US |
|---|---|---|
| Teaspoon | 5 ml | 4.93 ml |
| Tablespoon | 15 ml | 14.79 ml |
| Cup | 250 ml (metric) | 236.59 ml |
| Fluid ounce | 28.41 ml | 29.57 ml |
The teaspoon and tablespoon gap is small enough to ignore for most cooking. The cup gap is the one that catches people out, particularly with American recipes, because it adds up across a whole recipe — a "cup" of flour measured the US way and the metric way can differ by more than 5g. Our calculator's cup, tablespoon and teaspoon figures use the UK/metric standard by default, with US-precise values available in the density picker and the "More units" list if you're converting an American recipe exactly as written.
Getting accurate results every time
- Weigh dry ingredients where you can. Flour, sugar and cocoa compress differently depending on how they're scooped, so a kitchen scale will always be more repeatable than a measuring cup for these.
- Use the spoon-and-level method if you're measuring by volume. Spoon the ingredient into the cup or spoon without packing it down, then level the top with a knife. Scooping straight from the bag packs it tighter and can add 10–15% more than the recipe intended.
- Room-temperature liquids measure more consistently. Cold honey or melted butter that's started to set again will give a slightly different reading than when it's properly liquid.
- If your ingredient isn't listed, look up its density rather than guessing. A quick search for "[ingredient] density g/ml" usually turns up a reliable figure — plug it into Custom density and the calculator handles the rest.
- Double-check which cup or spoon a recipe means. If a recipe doesn't say US or metric, and the ingredient list "feels" American (cups of butter in sticks, for instance), it's worth assuming US measurements.
Frequently asked questions
Is 1 gram the same as 1 millilitre?
Only for water, and only approximately. Water's density is close enough to 1 g/ml at room temperature that the two numbers are effectively interchangeable for cooking. For anything else — milk, oil, flour, honey — the weight and the volume are different, sometimes by a wide margin, because grams measure weight and millilitres measure volume, and only density connects the two.
How many ml is 100 grams of water?
100 ml. Water has a density of 1.00 g/ml, so grams and millilitres match exactly at room temperature.
How many ml is 100g of flour?
About 189 ml, using plain flour's typical density of 0.53 g/ml. This is noticeably more than the 100 ml you'd get with water, because flour is full of tiny air pockets and is much lighter for its size.
Why do grams and millilitres give a different answer for different ingredients?
Because the relationship between weight and volume depends entirely on density, and every ingredient has a different one. A dense ingredient like honey packs a lot of weight into a small volume, so a given weight of honey takes up less space than the same weight of a lighter ingredient like flour or oats.
Can I use this converter for any ingredient, even one that isn't in the list?
Yes. Select Custom density at the top of the ingredient list and enter the density in whichever unit suits you (g/mL, kg/m³, lb/ft³, g/tsp and 21 others are all supported). The calculator will convert grams and millilitres for that value just as it does for any of the 59 built-in ingredients.
What's the difference between a UK tablespoon and a US tablespoon?
A UK (and general metric) tablespoon is 15 ml. A US tablespoon is 14.79 ml. The difference is small enough to ignore for a single spoonful, but it's worth being consistent within a recipe — mixing UK and US spoon measures in the same dish is a more common source of error than the spoon size itself.
How accurate is this grams to ml converter?
The unit conversions (litres, cups, ounces, pounds, and so on) are calculated from the exact legal definitions of those units, so those are precise. The ingredient densities are drawn from standard cooking and food-science references and represent a typical value for that ingredient — actual density can vary slightly by brand, temperature and how the ingredient was measured, which is true of every density-based converter, not just this one. For a specific product, the density printed on the packaging (if there is one) will always be the most accurate figure.
Do I need to know the ingredient's density to use this tool?
No. That's the main point of the ingredient picker — the density is already filled in for 59 common ingredients. You only need to look up a density yourself if you're converting something unusual that isn't on the list.
Can I convert ml to grams as well as grams to ml?
Yes, both directions are built into the same calculator. Use the "Grams to ml" and "ml to grams" tabs at the top to switch which way the conversion runs — the ingredient and density you've chosen carry over either way.
Is a measuring jug or a kitchen scale more accurate for baking?
A kitchen scale, for dry and semi-solid ingredients. Weight doesn't change based on how the ingredient settles, how firmly it's packed, or the exact shape of your container, so it's inherently more repeatable than volume for things like flour, sugar or grated cheese. A jug is perfectly accurate for pure liquids like water, milk or oil, where volume behaves consistently.
Add this calculator to your website
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