# Conversion to sea-level pressure Calculator

## Calculates the sea-level pressure from the atmospheric pressure, temperature and altitude at the present location. | |||

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- Purpose of use
- Reset weather station

[1] 2020/01/05 02:13 Male / 60 years old level or over / A retired person / Very /

- Purpose of use
- school assignment

[2] 2019/12/07 03:24 Male / Under 20 years old / High-school/ University/ Grad student / Very /

- Purpose of use
- Develop a personal weather station (PWS)
- Comment/Request
- I am developing a personal weather station (PWS) using a Particle Photon, the SHT31 temperature and humidity sensor, the BMP388 barometric pressure sensor, and the Davis anemometer for Vantage Pro2, the PWS is reporting the barometric pressure to Wunderground, and Wunderground requires this to be at SeaLevel, which means no mater at what altitude the PWS is, the barometric pressure always will be the same, or 29.62 inHg, here is where this formula solved my problem. Of course, I divided the result by 33.8639. Bingo! Just in case, here is the formula: seaLevel = (hPa * pow(1 - (0.0065*altitude) / (bmp.temperature + (0.0065 * altitude) + 273.15),-5.257 )) / 33.8639;

Thanks a lot!

[3] 2019/11/29 17:06 Male / 50 years old level / A teacher / A researcher / Very /

- Purpose of use
- Hobby

[4] 2019/10/16 04:23 Male / 60 years old level or over / A retired person / Useful /

- Purpose of use
- for officeuse in Pakistan Meteorological Department

[5] 2019/10/03 15:09 Male / 50 years old level / An office worker / A public employee / Very /

- Purpose of use
- Model rocket altimeter
- Comment/Request
- What do the "h" and the "T" mean in the equation?

[6] 2019/09/21 13:24 Male / 20 years old level / Others / Very /

- Purpose of use
- Calibration of weather station

[7] 2019/09/15 08:04 - / 40 years old level / High-school/ University/ Grad student / Very /

- Purpose of use
- bme280 education
- Comment/Request
- idk if its official formula ,but looks like its working for me, already used it in arduino sketch ,thank you

[8] 2019/09/07 17:01 Male / 30 years old level / A homemaker / Useful /

- Purpose of use
- Calibrate BMP280 sensor, which shows 1012 at 110m on Solta island. There are nearby stations 20km away: Split (Marjan) measuring 1024.3 and Hvar island with almost the same. Reduced value was 1024.9 which may be in the precision range. Thanks.

[9] 2019/03/23 07:49 Male / 60 years old level or over / An engineer / Very /

- Purpose of use
- weather station calibration

[10] 2019/01/10 04:21 Male / 50 years old level / An office worker / A public employee / Very /

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