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water grams to ml Converter

Convert water grams to ml and back at 1.00 g/ml — the 1:1 reference for every other ingredient on this site — with one tap. Everything runs instantly in your browser; nothing is uploaded.

Convert water grams ⇄ ml

Grams = ml for water — 1 gram of water is 1 millilitre (at room temperature, near enough exactly).
Presets
100 ml
100 g = 100 ml (at density 1 g/ml)

Formula: 100 g ÷ 1 g/ml = 100 ml

Approximate densities: water is 1.00 g/ml at 4 °C and about 0.998 g/ml at room temperature — a 0.2% difference, far below kitchen accuracy. This page is the 1:1 reference every other density page links to.

How the water conversion works

The converter applies ml = grams ÷ density, with water's density at 1.00 g/ml — the definition every other density on this site is measured against. A gram of water is a millilitre of water, which is why water is the reference page for the whole density cluster.

Worked example: a recipe calling for 250 g of water needs 250 ÷ 1.00 = 250 ml — about 1.06 US cups (250 ÷ 236.588). A litre of water is 1,000 g, exactly 1 kg.

Treat 1.00 g/ml as exact for kitchen purposes: the real value drifts from 1.00 at 4 °C to about 0.998 at room temperature, a difference far below any measuring jug's accuracy.

Quick reference

  • 50 g water — 50.0 ml
  • 100 g water — 100.0 ml
  • 236.588 g water (1 US cup) — 236.6 ml
  • 250 g water — 250.0 ml
  • 500 g water — 500.0 ml
  • 1,000 g water (1 litre) — 1,000.0 ml

This is the dedicated water page of our grams to ml converter — the 1:1 reference page. Every other ingredient page on this site — honey, oil, milk, maple syrup, yogurt and cream — measures its density against this page.

water questions

How many ml is 100 g of water?
100 ml — water's density is 1.00 g/ml, so grams and millilitres are equal.
Is 1 gram of water always 1 ml?
Near enough always for cooking. At 4 °C it is exactly 1.00 g/ml; at room temperature about 0.998 g/ml — a 0.2% difference no recipe can detect.
How many grams is a US cup of water?
About 236.6 g — one US cup is 236.588 ml, and at 1.00 g/ml that is 236.588 g.
Why do other ingredients need a density?
Because only water is 1:1. Honey is 1.42 g/ml, oil is 0.92 g/ml — a gram of honey takes up less volume than a gram of water, and a gram of oil takes up more. That is why every ingredient page on this site carries its own density.
Can I convert ml of water back to grams?
Yes — switch the direction above. Grams = ml × density, so 500 ml of water is 500 × 1.00 = 500 g.

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Sources & official guidance

Estimate only — ingredient weights vary by packing, grind, brand and temperature. See our disclaimer.