Atmospheric Pressure at Elevation Calculator
Enter an elevation to see the standard air pressure there. Add today's forecast pressure to see the actual pressure at your elevation.
The number in your weather forecast, in inHg.
Standard air pressure
—inHg
- hPa (millibars)
- —
- psi
- —
- kPa
- —
- mmHg
- —
- Share of sea level
- —
Standard atmosphere (U.S. Standard Atmosphere, 1976). Weather moves real values a little.
Standard air pressure by elevation
| Elevation | inHg | hPa | psi | % of sea level |
|---|---|---|---|---|
| 0 ft | 29.92 | 1,013 | 14.70 | 100% |
| 1,000 ft | 28.86 | 977 | 14.17 | 96% |
| 2,000 ft | 27.82 | 942 | 13.66 | 93% |
| 3,000 ft | 26.82 | 908 | 13.17 | 90% |
| 4,000 ft | 25.84 | 875 | 12.69 | 86% |
| 5,000 ft | 24.90 | 843 | 12.23 | 83% |
| 5,280 ft (one mile) | 24.64 | 834 | 12.10 | 82% |
| 6,000 ft | 23.98 | 812 | 11.78 | 80% |
| 7,000 ft | 23.09 | 782 | 11.34 | 77% |
| 8,000 ft | 22.22 | 753 | 10.92 | 74% |
| 9,000 ft | 21.39 | 724 | 10.50 | 71% |
| 10,000 ft | 20.58 | 697 | 10.11 | 69% |
| 12,000 ft | 19.03 | 644 | 9.35 | 64% |
| 14,000 ft | 17.58 | 595 | 8.63 | 59% |
| 20,000 ft | 13.75 | 466 | 6.75 | 46% |
| 29,032 ft (Everest) | 9.28 | 314 | 4.56 | 31% |
The standard-atmosphere formula used here holds up to 36,089 ft (11,000 m).
How it is calculated
Standard pressure: P = 101.325 kPa × (1 − 2.25577 × 10⁻⁵ × h)5.25588, with h in meters (U.S. Standard Atmosphere, 1976). With a forecast value, we scale it by the same ratio: pressure here ≈ sea-level pressure × (standard pressure at your elevation ÷ standard sea-level pressure). That is an approximation; the real correction also depends on temperature.
Related tools
Frequently asked questions
Why does my weather app show sea-level pressure even though I live high up?
Weather stations convert their readings to the value they would show at sea level, so maps from different elevations can be compared (NOAA). The pressure you actually feel at elevation is lower; enter the forecast value below to convert it.
What is standard air pressure at sea level?
29.92 inches of mercury, which is 1013.25 hPa (millibars), 14.70 psi or 101.325 kPa.
How much does air pressure drop with elevation?
Roughly 1 inHg per 1,000 ft near sea level, falling more slowly as you go higher. At about 18,000 ft the pressure is half of sea level; the table lists standard values.
Does lower pressure affect my body or cooking?
Yes. Lower pressure means less oxygen per breath and a lower boiling point for water. See the boiling point calculator for cooking temperatures.
Sources
- U.S. Standard Atmosphere, 1976 — pressure at each elevation
- NOAA JetStream: Air Pressure — sea-level conversion of station pressure; standard sea-level pressure
- NWS station pressure calculator — reference for converting sea-level pressure to station pressure
How each number is produced: methodology and data sources.