Grams to ML Calculator
NewConvert grams to millilitres by ingredient — water, flour, milk, sugar and more.
Grams to ml: why the answer depends on what you're measuring
Grams measure mass — how much matter something contains. Millilitres measure volume — how much space it takes up. The two are only numerically interchangeable for a substance with a density of exactly 1 gram per millilitre, and water is essentially the only common one that fits that description almost exactly. For everything else — flour, sugar, oil, honey, milk — the gram figure and the ml figure are genuinely different numbers, sometimes by a wide margin, because density (mass per unit volume) varies by ingredient.
This matters most in cooking, where a recipe might give an ingredient by weight (grams) but your measuring equipment is calibrated by volume (millilitres or a measuring jug), or vice versa. "How many ml is 100g of flour" doesn't have the same answer as "how many ml is 100g of water" — and treating them as interchangeable is one of the most common small errors in home baking. This calculator lets you pick the ingredient so the density is applied correctly, rather than silently assuming water.
Quick conversions (water — 1:1 baseline)
For water and water-like liquids, grams and ml are equal, which makes this the simplest reference baseline:
Common grams to ml conversions, by ingredient
The same gram weight converts to a different ml figure for each ingredient below, based on typical density:
| Grams | Water (1.00) | Milk (1.03) | Sugar (0.85) | Flour (0.53) | Oil (0.92) | Honey (1.42) |
|---|---|---|---|---|---|---|
| 25 g | 25 ml | 24.3 ml | 29.4 ml | 47.2 ml | 27.2 ml | 17.6 ml |
| 50 g | 50 ml | 48.5 ml | 58.8 ml | 94.3 ml | 54.3 ml | 35.2 ml |
| 100 g | 100 ml | 97.1 ml | 117.6 ml | 188.7 ml | 108.7 ml | 70.4 ml |
| 150 g | 150 ml | 145.6 ml | 176.5 ml | 283.0 ml | 163.0 ml | 105.6 ml |
| 200 g | 200 ml | 194.2 ml | 235.3 ml | 377.4 ml | 217.4 ml | 140.8 ml |
| 250 g | 250 ml | 242.7 ml | 294.1 ml | 471.7 ml | 271.7 ml | 176.1 ml |
| 300 g | 300 ml | 291.3 ml | 352.9 ml | 566.0 ml | 326.1 ml | 211.3 ml |
| 500 g | 500 ml | 485.4 ml | 588.2 ml | 943.4 ml | 543.5 ml | 352.1 ml |
Conversion formula and method
The formula for converting grams to millilitres always requires density:
Millilitres = Grams ÷ Density (g/ml)
Worked example: flour
Plain flour has a typical density of about 0.53g per ml (it varies with how packed or sifted it is). For 100g of flour: 100 ÷ 0.53 = 188.7ml. Note this is nearly double the water figure — flour is much less dense, so it takes up nearly twice the volume for the same weight.
Worked example: honey
Honey has a typical density of about 1.42g per ml — denser than water. For 100g of honey: 100 ÷ 1.42 = 70.4ml — noticeably less volume than the equivalent weight of water.
Typical densities used in this calculator
| Ingredient | Density (g/ml) | Note |
|---|---|---|
| Water | 1.00 | The 1:1 baseline |
| Milk | 1.03 | Slightly denser than water |
| Granulated sugar | 0.85 | Varies with grain size and packing |
| Plain flour | 0.53 | Varies significantly — sifted vs packed |
| Vegetable oil | 0.92 | Lighter than water |
| Honey | 1.42 | Denser than water |
| Melted butter | 0.91 | Lighter than water |
Real-world comparisons: cooking measures
- 100g flour ≈ 189ml — roughly ¾ of a standard 250ml measuring cup by volume, despite being a fairly modest weight.
- 100g sugar ≈ 118ml — under half a standard measuring cup.
- 100g honey ≈ 70ml — less than a third of a measuring cup, since honey is dense and heavy for its volume.
- 250g water = 250ml exactly — the one ingredient where the measuring jug and the kitchen scale will always agree.
- A standard UK tablespoon (15ml) holds roughly 15g of water, 21g of honey, or about 8g of flour — illustrating how far the same-volume weight swings by ingredient.
Extended table: fine granularity for water and flour
The two most frequently looked-up cases side by side, in 10g steps:
| Grams | Water (ml) | Plain flour (ml) |
|---|---|---|
| 10 g | 10 ml | 18.9 ml |
| 20 g | 20 ml | 37.7 ml |
| 30 g | 30 ml | 56.6 ml |
| 40 g | 40 ml | 75.5 ml |
| 50 g | 50 ml | 94.3 ml |
| 60 g | 60 ml | 113.2 ml |
| 70 g | 70 ml | 132.1 ml |
| 80 g | 80 ml | 150.9 ml |
| 90 g | 90 ml | 169.8 ml |
| 100 g | 100 ml | 188.7 ml |
| 120 g | 120 ml | 226.4 ml |
| 140 g | 140 ml | 264.2 ml |
| 150 g | 150 ml | 283.0 ml |
| 160 g | 160 ml | 301.9 ml |
| 180 g | 180 ml | 339.6 ml |
| 200 g | 200 ml | 377.4 ml |
| 220 g | 220 ml | 415.1 ml |
| 240 g | 240 ml | 452.8 ml |
| 250 g | 250 ml | 471.7 ml |
| 270 g | 270 ml | 509.4 ml |
| 300 g | 300 ml | 566.0 ml |
Historical context: two different kinds of unit
The gram and the millilitre are both part of the metric system introduced in France in the 1790s, but they were deliberately built to measure different physical properties from the start — the gram from the kilogram (mass, originally intended to be the mass of one litre of water at maximum density) and the litre (volume, defined as the space occupied by a cube 10cm on each side). For pure water near 4°C, the two systems were designed to line up almost exactly at a 1:1 ratio — which is precisely why water is the special case, not a coincidence. Every other substance's density depends on its own physical structure (how tightly its particles pack, how much air is trapped in it, its temperature), so it was never going to convert 1:1 without density being part of the calculation.
In UK cooking specifically, the shift toward weighing ingredients by grams (rather than the older imperial ounces or volume-based US "cups") became standard through 20th-century recipe writing and metric-scale adoption, while many source recipes — especially American ones — continued to specify ingredients by cup or ml volume. That mismatch is a major reason grams-to-ml conversion queries are so common in a cooking context specifically.
Where this conversion is actually needed
- Following a US recipe with a UK scale: US recipes often specify cups or fluid ounces; converting to grams (by density) lets you weigh instead of guessing volume.
- Converting a UK recipe for use with a jug instead of scales: if you only have a measuring jug and a recipe gives grams, you need the ingredient's density to get an accurate ml figure.
- Baking accuracy: flour and sugar volumes are notoriously inconsistent by scoop (packed vs loose), so professional bakers weigh in grams — but home cooks converting back to a jug measurement need the correct density, not the water assumption.
- Liquid medication and dosing: some liquid formulations are dosed by weight but measured by volume — always use the manufacturer's stated density or dosing instructions rather than assuming water's 1:1 ratio.
Common mistakes when converting grams to ml
- Assuming the water 1:1 ratio applies to everything. This is by far the most common error — treating "100g" and "100ml" as interchangeable for flour, sugar, oil or honey introduces errors of anywhere from 20% to nearly double, depending on the ingredient.
- Mixing up US cups and metric measures. A "cup" in an American recipe is 240ml, not a round metric figure, and older UK recipe books sometimes reference an imperial cup (approximately 284ml) — converting cup-based recipes to grams without checking which cup is meant compounds the density issue further.
- Using one flour density for every situation. Sifted flour is noticeably less dense than scooped-and-packed flour from the same bag — the same 100g weight can occupy a meaningfully different volume depending on preparation, which is why baking recipes that care about precision specify weight rather than volume in the first place.
- Generalising one brand's stated density to all products in that category. Honey, oils and syrups vary in density by brand and composition — a specific product's packaging or manufacturer data will always be more accurate than a general cooking-reference figure.
Accuracy and precision note
Unlike the other conversions on this site, grams-to-ml is not a fixed, universal conversion — it depends entirely on the density of the specific substance, which itself can vary by temperature, how packed or aerated the ingredient is, and even the specific brand or batch. The densities used in this calculator (flour 0.53, sugar 0.85, oil 0.92, honey 1.42, milk 1.03, melted butter 0.91) are typical, commonly cited cooking values, not exact physical constants — for precision-critical applications (pharmaceutical, laboratory, or industrial use), always use the specific, measured density of the exact substance involved rather than a general estimate. Water is the only case in this calculator that is genuinely exact, since 1 gram of water is defined to be extremely close to 1ml at standard conditions.
Frequently asked questions
Are grams and millilitres the same thing?
No, not generally. Grams measure mass and millilitres measure volume — they're only numerically equal for a substance with a density of exactly 1 gram per millilitre, which is true for water but not for most other ingredients. Flour, sugar, oil and honey all convert to a different ml figure than their gram figure.
How many ml is 100 grams?
If it's water, 100 grams is exactly 100ml. For other ingredients it varies by density: 100g of plain flour is roughly 189ml, 100g of granulated sugar is roughly 118ml, and 100g of honey is roughly 70ml.
How many ml is 250g of flour?
250g of plain flour is approximately 472ml, using a typical flour density of about 0.53g per ml. This can vary somewhat depending on whether the flour is sifted or packed.
What is 100g in ml for flour?
100g of plain flour is approximately 189ml. Flour is much less dense than water, so its gram and ml figures differ substantially — this is a common source of error in recipe conversions.
How do I convert grams to ml for cooking?
Divide the weight in grams by the ingredient's density in grams per millilitre. For water-based liquids, density is 1.00, so grams and ml are equal. For thicker or lighter ingredients (flour, sugar, oil, honey), you need that ingredient's specific density — this calculator includes common cooking densities so you don't need to look them up separately.
Is 1 gram always equal to 1 millilitre?
Only for water, and substances with a near-identical density to water. For anything denser than water (like honey), 1 gram is less than 1ml. For anything less dense (like flour or oil), 1 gram is more than 1ml.
How many ml is 150 grams?
150g of water is 150ml. 150g of flour is approximately 283ml, and 150g of granulated sugar is approximately 176ml — the figure depends entirely on which ingredient you're measuring.
What is 25g in ml?
25g of water is 25ml. 25g of flour is approximately 47ml, and 25g of oil is approximately 27ml.
Why do grams and ml differ for ingredients like sugar and oil?
Because density (mass per unit volume) differs by ingredient. Sugar packs more mass into a given volume than a light ingredient does (about 0.85g/ml), while oil is lighter than water for its volume (about 0.92g/ml) — so the same gram weight of each occupies a different volume in millilitres.
What is 300 grams in millilitres?
300g of water is 300ml. 300g of plain flour is approximately 566ml, and 300g of honey is approximately 211ml.
What is 500g in ml?
500g of water is 500ml. 500g of plain flour is approximately 943ml, and 500g of granulated sugar is approximately 588ml.
What is 250g in ml?
250g of water is 250ml. 250g of plain flour is approximately 472ml, and 250g of granulated sugar is approximately 294ml.
What is 200g in ml?
200g of water is 200ml. 200g of plain flour is approximately 377ml, and 200g of granulated sugar is approximately 235ml.
How many ml is 50 grams?
50g of water is 50ml. 50g of plain flour is approximately 94ml, and 50g of granulated sugar is approximately 59ml.
What is 40g in ml?
40g of water is 40ml. 40g of plain flour is approximately 75ml, and 40g of granulated sugar is approximately 47ml.
A quick note
Density figures used here are typical cooking approximations, not exact physical constants — they vary by brand, temperature and preparation (sifted vs packed, for example). For precision-critical use, always use the specific measured density of your exact ingredient or substance rather than a general estimate.