What is it?
The Density Calculator finds density, mass or volume when you know the other two. It also tells you whether the object would float in water.
Who is it for?
Science students, engineers estimating material weight, and anyone checking whether something floats or how much a tank of liquid weighs.
How to use it
Fill in two of the three boxes and leave the one you want to find empty. The answer appears as you type; there is no Calculate button. Tap Copy result to copy it, or Share on WhatsApp to send it.
Units
- Density is in kg/m³ and also shown in g/cm³ (divide kg/m³ by 1,000). Water is 1,000 kg/m³ = 1 g/cm³.
- Volume in m³: 1 litre = 0.001 m³, so a 2 L bottle is 0.002 m³. Mixing litres and m³ is the most common mistake.
Typical densities
- Steel 7,850; aluminium 2,700; concrete about 2,400; wood 400–900; ice 917; petrol about 740 kg/m³.
- Anything less dense than water (under 1,000 kg/m³) floats in fresh water. Sea water is a little denser (about 1,025).
Uses
Estimate the weight of a steel plate or a tank of oil from its size (find its volume with the Volume Calculator first), or check a school physics answer.
Errors and how to fix them
- “Fill in exactly two of the three boxes”: leave only the value you want empty.
- Unrealistic density: check volume units (litres vs m³).
Open the tool: Density Calculator
Still stuck?
Contact support. Tell us which tool or page you were using, what you tapped, what you saw, and your phone or computer and browser (for example: Android phone, Chrome). We reply by email.
Questions, or an error not listed here?
Tell us in the comments: what you were doing, the exact message you saw, and your device and browser. We read every comment and add new fixes to this article.