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Grams in Milliliters Converter

Need to know how many milliliters a weight in grams takes up? For water the numbers match, so enter the grams below. This assumes water, at a density of 1 g/mL.

Grams ⇄ Milliliters
g
=
mL
Result100 g = 100 mL
Quick answer
For water, 1 gram fills 1 milliliter, so the two numbers are equal: 100 g of water is 100 mL and 250 g is 250 mL. This works because water's density is 1 g/mL. Anything else shifts the result. A gram of oil takes up about 1.1 mL because oil is lighter, while a gram of honey needs only about 0.7 mL because it is denser.

Conversion table

Grams (g)Milliliters (mL)
5 g5
10 g10
25 g25
50 g50
100 g100
250 g250
500 g500
1000 g1000

How to convert Grams in mL

mL = grams ÷ densitywater density = 1 g/mL, so mL = grams · reverse: grams = mL × density
grams
the weight you enter
mL
the volume it fills
density
grams per mL, taken as 1 for water

Grams weigh mass and milliliters measure volume, so they match one-to-one only for water and other liquids close to a density of 1 g/mL. For anything else, divide the grams by that substance's density.

Frequently asked questions

How many mL is 100 grams of water?

100 g of water is 100 mL.

Is 1 gram the same as 1 mL?

For water, yes. For oil, honey or flour it is not, because those have a density other than 1 g/mL.

How many grams is 250 mL of water?

250 mL of water weighs 250 g.

How do I convert grams to mL for milk?

Divide the grams by milk's density of about 1.03, so 100 g of milk fills roughly 97 mL.

Why only water?

Because a gram equals a milliliter only when density is 1 g/mL, and water is the substance that fits that.