How to use the atmospheric pressure at altitude calculator
Estimate pressure at a given elevation. Enter altitude in the field above; the pressure, pressure, pressure are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- h — Altitude (m)
Worked example
With altitude = 3000 m, the calculator gives pressure ≈ 70.10852 kPa; pressure ≈ 701.0852 hPa; pressure ≈ 69.19173 % of sea level.
Frequently asked questions
What is the formula for the atmospheric pressure at altitude calculation?
Pressure (kPa) = 101.325 × (1-2.25577e-5 × h)^5.25588. Pressure (hPa) = [Pressure] × 10. Pressure (% of sea level) = 100 × [Pressure] / 101.325. Here h is altitude (m).
What inputs do I need for the atmospheric pressure at altitude calculator?
You need altitude in m. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.