Conversion to sea-level pressure Calculator

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

The atmospheric pressure shown on the weather map is adjusted to the equivalent sea level pressure. (1atm=1013.25hPa)
Conversion to sea-level pressure
    1. at present location:
Altitude h
    1. m
Atmospheric pressure P
    1. hPa
Temperature T
    1. °C

Sea-level pressure P0
    2. hPa
    2. atm
    Conversion to sea-level pressure
    [1-10] /92Disp-Num
    [1]  2020/01/05 02:13   Male / 60 years old level or over / A retired person / Very /
    Purpose of use
    Reset weather station
    [2]  2019/12/07 03:24   Male / Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    school assignment
    [3]  2019/11/29 17:06   Male / 50 years old level / A teacher / A researcher / Very /
    Purpose of use
    Develop a personal weather station (PWS)
    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!
    [4]  2019/10/16 04:23   Male / 60 years old level or over / A retired person / Useful /
    Purpose of use
    [5]  2019/10/03 15:09   Male / 50 years old level / An office worker / A public employee / Very /
    Purpose of use
    for officeuse in Pakistan Meteorological Department
    [6]  2019/09/21 13:24   Male / 20 years old level / Others / Very /
    Purpose of use
    Model rocket altimeter
    What do the "h" and the "T" mean in the equation?
    [7]  2019/09/15 08:04   - / 40 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Calibration of weather station
    [8]  2019/09/07 17:01   Male / 30 years old level / A homemaker / Useful /
    Purpose of use
    bme280 education
    idk if its official formula ,but looks like its working for me, already used it in arduino sketch ,thank you
    [9]  2019/03/23 07:49   Male / 60 years old level or over / An engineer / Very /
    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.
    [10]  2019/01/10 04:21   Male / 50 years old level / An office worker / A public employee / Very /
    Purpose of use
    weather station calibration


    Thank you for your questionnaire.
    Sending completion


    To improve this 'Conversion to sea-level pressure Calculator', please fill in questionnaire.
    Male or Female ?



    Purpose of use?
    Comment/Request (Click here to report a bug).Bug report (Click here to report questionnaire.)
    Calculation bug(Please enter information such as specific input values, calculation result, correct result, and reference materials (URL and documents).)
    Text bug(Please enter information such as wrong and correct texts)
    Your feedback and comments may be posted as customer voice.