Ans

Unit converter

Density.

Convert kg/m³ to g/cm³, or pick any of the 10 units in the menus. Type in either box and the other follows. Mass per unit volume, on a scale where water is almost exactly 1 g/cm³ — which is why that unit doubles as relative density.

kg/m³ → g/cm³Exact definition
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Kilograms per cubic metre to grams per cubic centimetre — common values, to 6 significant figures.
kg/m³g/cm³
1 kg/m³0.001 g/cm³
2 kg/m³0.002 g/cm³
3 kg/m³0.003 g/cm³
4 kg/m³0.004 g/cm³
5 kg/m³0.005 g/cm³
10 kg/m³0.01 g/cm³
15 kg/m³0.015 g/cm³
20 kg/m³0.02 g/cm³
25 kg/m³0.025 g/cm³
50 kg/m³0.05 g/cm³
75 kg/m³0.075 g/cm³
100 kg/m³0.1 g/cm³
250 kg/m³0.25 g/cm³
500 kg/m³0.5 g/cm³
1000 kg/m³1 g/cm³
1 kg/m³=0.001 g/cm³ 1 g/cm³=1000 kg/m³

Definitions

  • The kilogram per cubic metre is the SI unit of density. Air at sea level is about 1.2 kg/m³.
  • The gram per cubic centimetre is 1000 kg/m³, and a convenient scale: water is almost exactly 1 g/cm³, so the number doubles as relative density.
  • Density is mass per volume. Converting a density does not convert a material's mass or volume, and cooking mass-to-volume questions need the material's density.
  • 9 of the 10 units are exact by definition; the rest are conventional or measured values. The display says which kind you are looking at.

How it works

Every value is converted into kilograms per cubic metre and then back out into the unit you asked for. One route covers every pairing in the menus, so an unusual combination is no less accurate than a common one, and adding a unit affects only that unit.

Both boxes are live. Whichever one you last typed in is the source, changing either menu recalculates straight away, and Swap exchanges the units and the values so the number you are reading stays where you are looking.

Display precision sets a maximum number of significant figures and trims trailing zeroes, so it changes what you see and never what was calculated. The editable box always holds a plain number at full working precision, so you can carry on from either side.

Common questions this answers: how many grams per cubic centimetre in a kilogram per cubic metre (0.001), how many kilograms per cubic metre in a gram per cubic centimetre (1000), and what 1000 kg/m³ is in grams per cubic centimetre (1 g/cm³).

From the maker of Ans — a scientific calculator you can own. Same idea: a proper instrument, nothing in the way.