100 mL of whole milk weighs about 103.1 g, of vegetable oil 92.1 g, of honey 143.3 g and of all-purpose flour 50.7 g. Millilitres measure volume and grams measure weight, so the answer depends on the ingredient. Only water and liquids close to it come out at roughly 1 g per mL. Pick the ingredient below and the converter applies its published weight.
grams = millilitres x grams per mL of the ingredient
The grams per mL come from the weight of one US cup (236.6 mL) in USDA FoodData Central or King Arthur Baking's chart. USDA lists a cup of whole milk at 244 g, so a millilitre of milk is 244 / 236.6 = 1.03 g. King Arthur lists a cup of all-purpose flour at 120 g, so a millilitre of flour is 0.507 g. To go the other way, divide the grams by the same figure.
Common amounts
Grams in millilitres of six ingredients
Millilitres
Water
Milk
Vegetable oil
Honey
All-purpose flour
Granulated sugar
50 mL
50.1
51.6
46.1
71.6
25.4
41.8
100 mL
100.2
103.1
92.1
143.3
50.7
83.7
250 mL
250.4
257.8
230.4
358.2
126.8
209.2
500 mL
500.9
515.7
460.7
716.4
253.6
418.4
Liquids are steady: a millilitre of milk, oil or honey weighs the same every time. Flour and sugar are not. These figures assume the flour is spooned in and levelled, as King Arthur measures it; flour scooped straight from the bag packs down and weighs more. For dry ingredients, a recipe that gives grams is more reliable than one that gives millilitres.
Metric cups and spoons
A metric cup is 250 mL, a metric tablespoon 15 mL and a metric teaspoon 5 mL, so a recipe from the UK, Australia, Canada or New Zealand that lists cups or spoons converts the same way. Choose the metric unit in the From box. For US cups, the grams to cups converter covers every cup size, and the tablespoons to grams converter covers US and Australian spoons.
Questions people ask
Is 1 mL equal to 1 gram?
Only for water and liquids very close to it. USDA lists a US cup of water (236.6 mL) at 237 g, which is about 1 g per mL. Milk is a little heavier at 1.03 g per mL, oil lighter at 0.92 g, and honey much heavier at 1.43 g.
How many grams is 100 mL of milk?
About 103.1 g of whole milk, using USDA's 244 g per cup. 250 mL is 257.8 g and 1 liter is 1,031 g.
How many grams is 250 mL of flour?
About 126.8 g of all-purpose flour, spooned and levelled at King Arthur's 120 g per cup. Scooped flour weighs more, which is why bakers weigh it.
How many grams is 1/2 cup of honey?
A half US cup is 118.3 mL, which holds 169.5 g of honey (USDA lists 339 g a cup). A 15 mL metric tablespoon of honey is about 21.5 g.
How many grams is 1 liter of oil?
About 921.4 g of vegetable (canola) oil and 913 g of olive oil, from USDA's 218 g and 216 g per cup. Oil is lighter than water, so a liter weighs less than a kilogram.
How do I convert grams to mL?
Divide the grams by the ingredient's grams per mL, or press the swap button in the converter. 100 g of milk is 97 mL, and 100 g of all-purpose flour is about 197.2 mL.