Live
Kinetic Energy Calculator
Calculate the kinetic energy of a moving object from its mass and speed: KE = ½mv².
Air Density Calculator
Calculate air density from temperature, pressure and humidity, using the ideal gas law for dry air and water vapor.
Did we solve your problem today?
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
ρ = p_d ÷ (R_d × T) + p_v ÷ (R_v × T)
R_d = 287.058 J/(kg·K), R_v = 461.495 J/(kg·K)
p_v = RH × 6.1078 × 10^(7.5T ÷ (T + 237.3)) hPa (Tetens)
At 15 °C, 1013.25 hPa and dry air the result is the standard 1.225 kg/m³. Humid air is slightly less dense than dry air, because water vapor is lighter than nitrogen and oxygen. Use station pressure (not sea-level adjusted) for high altitudes.
Frequently asked questions
Why does air density matter?
It affects aircraft lift and engine power, ballistics, sports and HVAC calculations.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
See our methodology and editorial policy. Think something’s off? Report an error with this tool.
Related tools
All ScienceLive
Acceleration Calculator
Find acceleration from a change in velocity over time, or from force and mass.
Live
Projectile Motion Calculator
Calculate the range, flight time and maximum height of a projectile from launch speed, angle and height.
Live
Ohm's Law Calculator
Enter any two of voltage, current, resistance and power to calculate the other two with Ohm’s law.
Live
Speed Calculator
Solve speed, distance or time: enter any two and get the third, in metric or imperial units.
Live
Coulomb’s Law Calculator
Calculate the electrostatic force between two point charges with Coulomb’s law, or solve for a charge or the distance.