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Air Density Calculator
Calculate air density from temperature, pressure and humidity, using the ideal gas law for dry air and water vapor.
Kinetic Energy Calculator
Calculate the kinetic energy of a moving object from its mass and speed: KE = ½mv².
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How to use this calculator
Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
Formula
KE = ½ × m × v² (J = kg × m²/s²)
Because speed is squared, doubling speed quadruples kinetic energy, which is why stopping distance grows so fast with speed. Example: a 1,500 kg car at 60 km/h (16.67 m/s) has ½ × 1500 × 16.67² ≈ 208 kJ.
Frequently asked questions
What units should I use?
Mass in kilograms and speed in m/s give joules; the calculator converts other units for you.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
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