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Use our sea level pressure calculator to estimate sea level pressure from station pressure, elevation, temperature, and relative humidity.
| Term | Meaning |
|---|---|
| P_SL = Ps x exp(g x h / (Rd x Tv)) | Hypsometric reduction of station pressure to sea level |
| g = 9.80665 m/s^2 | Standard gravitational acceleration |
| Rd = 287.05 J/(kg*K) | Specific gas constant for dry air |
| Tv = T / (1 - 0.379 x e/P) | Approximate virtual temperature from air temperature, vapor pressure (e), and pressure (P) -- used only when Relative Humidity is supplied |
Our sea level pressure calculator helps you estimate air pressure at sea level. It uses station pressure, elevation, and air temperature. You can also enter relative humidity for a more tailored estimate.
Weather stations sit at many heights. So, their pressure readings can differ. This tool adjusts a station reading to sea level. It helps you compare pressure readings from places at different heights.
The calculator uses the hypsometric equation:
Sea Level Pressure = Station Pressure × exp[(9.80665 × Elevation) ÷ (287.05 × Virtual Temperature)]
Here, station pressure is in pascals (Pa), elevation is in meters (m), and virtual temperature is in kelvin (K). The gas constant for dry air is 287.05 J/(kg·K). The value 9.80665 m/s² is gravity.
The calculator converts your inputs to these units before it runs the formula. If you enter relative humidity, it estimates virtual temperature from air temperature, humidity, and station pressure. If you leave humidity blank, it uses your converted temperature as the virtual temperature.
This method estimates sea level pressure. It does not predict pressure from a standard atmosphere.
Enter station pressure. Type the pressure from your weather station or barometer.
Choose the pressure unit. Select hPa, kPa, Pa, mbar, or inHg.
Enter station elevation. Add the height in meters or feet above sea level.
Enter the temperature. Use the mean temperature for the air layer. Choose °C, °F, or K. Add relative humidity if you know it.
Calculate the result. Read the estimated sea level pressure and the pressure change. Check the units before you use the result.
Suppose a weather station reports 964 hPa. Its elevation is 346 meters. The mean virtual temperature is 302.3 K. No humidity value is entered.
First, convert station pressure to pascals:
964 × 100 = 96,400 Pa
Next, calculate the exponent:
(9.80665 × 346) ÷ (287.05 × 302.3) ≈ 0.03904
Then apply the formula:
96,400 × exp(0.03904) ≈ 100,240 Pa
Convert the result to hPa:
100,240 ÷ 100 ≈ 1,002.4 hPa
Final result: about 1,002.4 hPa.
The pressure adjustment is about 38.4 hPa. This estimate assumes the given temperature represents the full air layer.
Our sea level pressure calculator makes pressure reduction simple. It supports common pressure, height, and temperature units. You can also add relative humidity. The tool then estimates sea level pressure and the pressure change.
Use a good temperature value for the best estimate. For official weather reports, follow the method used by your weather service.
Sea level pressure is air pressure adjusted to mean sea level. It helps people compare weather readings from places at different heights.
Use station pressure, elevation, and mean virtual temperature in the hypsometric equation. Convert all inputs to the right units first.
Air pressure tends to fall as height rises. There is less air above a high station than above a low one.
Yes. The calculator supports hPa, mbar, kPa, Pa, and inHg. One hPa equals one mbar.
Humidity can affect virtual temperature. This calculator uses relative humidity to estimate virtual temperature when you enter it.
No. This tool starts with measured station pressure and reduces it to sea level. A standard atmosphere calculator uses an assumed atmospheric model.