mL to Grams Converter
Milliliters measure volume and grams measure mass, so the conversion runs through density: grams = mL × g/mL. For water that’s a perfect 1:1 — 250 mL weighs 250 g.
Example: with Volume (mL) 250 · Substance Water (1.00 g/mL) · Custom density (g/mL) 1 → Weight: 250.00 g.
Computed by the calculator below using its default values. Change any input to see your own numbers.
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Check it outHow to convert ml to grams
Multiply milliliters by density in g/mL. Water sits at 1.00 g/mL, so the numbers simply carry over: 237 mL (one US cup) of water = 237 g, and 30 mL = 30 g. Everything else shifts: 30 mL of cooking oil weighs 27.6 g (0.92 g/mL), 30 mL of milk 30.9 g, and 30 mL of honey 42.6 g. Dry ingredients convert too if you know their bulk density — all-purpose flour is about 0.51 g/mL, so 100 mL of flour weighs roughly 51 g.
To go from grams back to milliliters, divide by the same density: 100 g of oil is 100 ÷ 0.92 ≈ 109 mL. For syrups and medicines, use the concentration or density on the label rather than a generic value — and remember that density drifts slightly with temperature, which matters for lab work but rarely in the kitchen.
How it’s calculated
Weight (g) = volume (mL) × density (g/mL). Reference densities: water 1.00 g/mL (NIST, 4°C), whole milk 1.03, cooking oil 0.92, honey 1.42; flour (0.507 g/mL) and granulated sugar (0.845 g/mL) are bulk densities derived from King Arthur cup weights (120 g and 200 g per 236.588 mL cup). The ounce row converts with 1 oz = 28.349523125 g.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Treating 1 mL as 1 g for everything — that’s only true for water; oil is 8% lighter and honey 42% heavier.
- Using a liquid’s density for a dry ingredient’s bulk density (or vice versa) — flour’s 0.51 g/mL includes the air between particles.
- Confusing mL with mg on medicine labels: concentration (mg/mL) is not density, and doses should use the label’s own numbers.
Frequently asked questions
Is 1 ml equal to 1 gram?
Only for water and water-like liquids: water’s density is 1 g/mL, so 1 mL weighs 1 g. Oil is about 0.92 g per mL and honey about 1.42 g.
How many grams is 237 ml?
237 mL is one US cup. For water that’s 237 g; for milk about 244 g; for cooking oil about 218 g.
How many grams is 30 ml?
30 g of water, 30.9 g of milk, 27.6 g of cooking oil, or 42.6 g of honey — multiply 30 mL by the density in g/mL.
How do I convert grams back to ml?
Divide grams by density: mL = g ÷ g/mL. For example, 100 g of cooking oil is 100 ÷ 0.92 ≈ 108.7 mL.