Skip to content
Lizely

Density Converter

Convert g/cm3, kg/m3, lb/ft3 and more density units

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Type the density you want to convert into the density value field.
  2. 2.Choose the source unit under 'From' and the target unit under 'To' — for example g/cm³ to kg/m³, or kg/m³ to lb/ft³.
  3. 3.Read the converted result instantly, or tick 'Show all units at once' to see the value across every unit together.

About Density Converter

A density converter changes any density figure between metric and imperial units — kilogram per cubic meter (kg/m³), gram per cubic centimeter (g/cm³), gram per milliliter (g/mL), gram per liter (g/L), kilogram per liter (kg/L), milligram per milliliter (mg/mL), pound per cubic foot (lb/ft³), pound per cubic inch (lb/in³), ounce per cubic foot (oz/ft³), ounce per cubic inch (oz/in³), and pound per US gallon (lb/gal) — instantly and entirely in your browser, with nothing uploaded.

Every unit is converted through one base unit, the SI kilogram per cubic meter (kg/m³), so g/cm3 to kg/m3 and kg/m3 to lb/ft3 both stay exact. The core factors are: 1 g/cm³ = 1000 kg/m³; g/cm³ is identical to g/mL because 1 milliliter equals 1 cubic centimeter; 1 kg/L = 1000 kg/m³ (also written as 1 tonne per cubic meter, t/m³); 1 g/L = 1 kg/m³; and 1 mg/mL = 1 kg/m³. On the imperial side, 1 lb/ft³ = 16.018463 kg/m³, 1 lb/in³ = 27679.905 kg/m³, 1 oz/in³ = 1729.994 kg/m³, and 1 lb/gal (US) = 119.82643 kg/m³. These are not rounded guesses — they follow directly from the exact definitions of the pound (0.45359237 kg), inch (0.0254 m), foot (0.3048 m) and US gallon (231 in³).

The easiest way to sanity-check any density is the water anchor. Pure water at about 4 °C has a density of 1 g/cm³, which is exactly 1000 kg/m³, 1 kg/L, and roughly 62.428 lb/ft³. Anything denser than water (which sinks) reads above these numbers, and anything lighter (which floats) reads below them — so a quick glance tells you whether a converted value is physically sensible.

Density matters across many fields. Engineers compare structural metals — steel is about 7850 kg/m³ (7.85 g/cm³), aluminum about 2700 kg/m³ — to trade strength against weight. Chemists and pharmacists work in g/mL and mg/mL for solutions and dosing. Shipping, concrete, HVAC and fuel calculations often live in lb/ft³ or lb/gal, while scientific work stays in SI kg/m³ or g/cm³. Because the metric world uses g/cm³ and kg/m³ while much of North American industry uses lb/ft³ and lb/gal, converting cleanly between the two systems is a daily need.

To use the tool, type a number, pick the source and target units, and read the answer immediately — there is no Run button, results update as you type. Enable 'Show all units at once' to see the same density expressed across every supported unit in one table, which is handy for spec sheets that mix conventions. Extremely large or small results switch to scientific notation so precision is never lost. Everything runs client-side, so your values never leave your device.

Frequently asked questions

How do I convert g/cm3 to kg/m3?
Multiply by 1000: 1 g/cm³ equals exactly 1000 kg/m³. This is a definition, since a gram is one-thousandth of a kilogram and a cubic centimeter is one-millionth of a cubic meter. For example, steel at 7.85 g/cm³ is 7850 kg/m³. To go the other way, from kg/m³ to g/cm³, divide by 1000.
How do I convert kg/m3 to lb/ft3?
Divide by 16.018463, because 1 lb/ft³ equals 16.018463 kg/m³. So 1000 kg/m³ (the density of water) is about 62.428 lb/ft³. This factor comes from the exact definitions of the pound (0.45359237 kg) and the foot (0.3048 m), matching NIST SP 811.
Is g/cm3 the same as g/mL?
Yes, they are identical. One milliliter is defined as exactly one cubic centimeter, so 1 g/cm³ equals 1 g/mL with no conversion needed. Both also equal 1000 kg/m³ and 1 kg/L. This is why water's density is quoted interchangeably as 1 g/cm³ or 1 g/mL.
What is the density of water in these units?
Pure water near 4 °C is about 1 g/cm³, which equals 1000 kg/m³, 1 g/mL, 1 kg/L, and roughly 62.428 lb/ft³. It is the standard reference point: substances denser than water sink and read higher numbers, while lighter ones float and read lower.
What is the difference between kg/L and kg/m3?
1 kg/L equals 1000 kg/m³, because one liter is one-thousandth of a cubic meter. So kg/L is numerically the same as g/cm³ (both are 1000 kg/m³) and is sometimes written as t/m³ (tonne per cubic meter). Use kg/m³ for SI/scientific work and kg/L when a value is more intuitive per liter.

Related tools

Calculators guides

View all