ML to grams converter, for the food in your jug.

To convert ml to grams, multiply the milliliters by the ingredient's density in grams per milliliter. Water is 1 g/mL, so 250 mL of water is 250 g. Whole milk is 1.031 g/mL, so 250 mL is 257.8 g. Honey is 1.433 g/mL, so 250 mL is 358.2 g. Milliliters measure space and grams measure weight, so the food decides the answer. Pick it from the list and the sum is done for you, with the working shown.

How to use the converter

1. Choose the food in Ingredient. Water is first in the list.
2. Type the volume in Amount. Fractions work, such as 1/2 or 1 1/2.
3. From is set to Milliliters (mL) and To to Grams (g). Change either one to get kilograms, ounces, pounds, tablespoons or cups.
4. For grams to ml, press the swap button between the two boxes.
5. Read the big card, the working under it and the USDA line that names the source.
6. Press Copy result or Copy link to keep it. Start again puts the page back as it was.

Where the densities come from

Each ingredient uses a household weight from the USDA FoodData Central SR Legacy data, for example "1 cup (339 g)" for honey. The number next to each ingredient in the table is the FDC item, and it links to the USDA page, read on 19 Oct 2026. The USDA page says SR Legacy was its final release of this kind of data and will not be updated. The USDA page does not give its cup in milliliters, so this tool takes it as the US customary cup, 8 US fluid ounces, which is 236.588 mL ( NIST Handbook 44, 2026, Appendix C). Density is the weight divided by that volume: 339 ÷ 236.588 = 1.433 g/mL for honey. If the USDA cup were a little different, every density would move by the same small percentage. The USDA weights are shown to three digits at most, so treat the answers as good to about three digits.

Water is 1 g per mL, with a small catch

The USDA lists tap water as "1 liter (1000 g)", which is 1 g/mL. The USGS Water Science School page on water density gives it as 1 g/mL and adds that it changes with temperature: 0.9998395 g/mL at 4 °C, 0.99802 at 21 °C and 0.95865 at 100 °C (read 19 Oct 2026). So 250 mL of water at 21 °C weighs 249.5 g, which is 0.2 percent under 250. For cooking you can ignore that. For hot water the gap grows, and for a lab you need the table.

Worked examples

Going the other way, divide. 100 g of honey takes up 100 ÷ 1.433 = 69.8 mL. 200 g of sugar takes up 200 ÷ 0.8454 = 236.6 mL, which is one US cup.

The same 100 mL, very different weights

Oil floats on water because it is lighter, and the table shows why: 100 mL of oil is 92.1 g. Flour is the extreme. It is mostly air between the grains, so 100 mL weighs about half as much as water.

Powders change with how you fill the cup

The USDA gives two weights for brown sugar: 220 g for a packed cup and 145 g for an unpacked cup. In milliliters that is 0.9299 g/mL against 0.6129 g/mL, so 250 mL weighs 232.5 g packed and 153.2 g loose, about 52 percent more when packed. Powdered sugar has the same split, 100 g sifted against 120 g unsifted. That is why those have their own rows. For any dry food, a scale beats a measuring jug.

Mistakes that change the answer

• Using 1 g per mL for everything. It is right for water and wrong for the rest. Using it for 250 mL of honey leaves you 108 g short.
• Mixing fluid ounces with ounces. A fluid ounce is a volume. An ounce is a weight. The USDA lists 1 fl oz of water as 29.6 g, while a weight ounce is 28.35 g. For ounces to milliliters see Oz to mL.
• Trusting a spoon from another country. A US tablespoon is 14.787 mL. Nutrition labels in the US round it to 15 mL. Use milliliters when you can.

An ingredient that is not in the list

Only foods with a household weight on a USDA page read for this tool are listed. Anything else is "not stated" here. If you know a density from the pack or another source, choose Custom density at the bottom of the list and type it in g/mL. A density given as grams per cup divides by 236.588. To go from grams to cups with this list, use the Grams to cups calculator, and for other units the Unit converter.