When to use this calculator
Calculate average material density from mass and volume. Temperature, composition and voids can affect measured density.
Explore the fluids & flow calculators for other questions in this topic. For a related calculation, use the Dynamic Pressure Calculator: Calculate dynamic pressure from fluid density and speed.
PUTTING IT INTO PRACTICE
Density: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Mass (kg) | 10 |
| Volume (m³) | 0.005 |
| Result | 2,000 kg/m³ |
- Check the input labels and enter the example values above.
- Apply the relationship: Density = mass ÷ volume.
- The result is 2,000 kg/m³, rounded for display.
How to interpret your result
Temperature, composition and voids can affect measured density.
Use the fluid properties at the relevant conditions. Gauge pressure is measured relative to a reference and differs from absolute pressure. Average flow velocity and characteristic length must match the geometry being modelled.
Frequently asked questions
Should hydrostatic pressure be added to atmospheric pressure?
Add the surface absolute pressure when an absolute result is needed. The basic liquid-column calculation alone gives the pressure increase with depth.
How do I use the density calculator?
Enter mass (kg), volume (m³). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Density = mass ÷ volume.
What should I check before using the result?
Temperature, composition and voids can affect measured density.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see OpenStax: fluids, density and pressure ↗. This is a topic reference, not an external review or endorsement of this tool.
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