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
    1.  
    2. hPa
=
    1.  
    2. atm
    Conversion to sea-level pressure
    [1-10] /103Disp-Num
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    [1]  2021/05/20 20:02   50 years old level / A retired person / Very /
    Purpose of use
    Calibration of electronic barometer.
    [2]  2021/05/11 01:03   60 years old level or over / A retired person / Very /
    Purpose of use
    Weekly reset of personal weather monitoring device.
    [3]  2021/01/25 03:46   50 years old level / Self-employed people / Very /
    Purpose of use
    Make effective use of the integrated pressure sensor within Home Automation solution.
    [4]  2021/01/08 23:49   30 years old level / An engineer / Useful /
    Purpose of use
    I was looking for the conversion formula which I could use in my smart home setup (OpenHab based).
    [5]  2021/01/08 02:09   Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    Going to be used to resolve pressure observations from mobile mesonets and a home built AWOS station.
    [6]  2020/09/23 21:30   60 years old level or over / A retired person / Very /
    Purpose of use
    Home-made weather station.
    Comment/Request
    A big "thank you!" to "2020/05/19 06:51 Male / 50 years old level / An engineer / Very / " -- that code did indeed help a great deal. Thanks too, to whomever researched the equation. I now have relative humidity to within a millibar (hPa) or so. Result!
    [7]  2020/07/03 17:47   30 years old level / A teacher / A researcher / Very /
    Purpose of use
    conversion of pressure sensor readout
    Comment/Request
    thanks for the formula!
    [8]  2020/05/19 06:51   50 years old level / An engineer / Very /
    Purpose of use
    Want to understand the BME280 and relevant information for my Arduino weather station. Took some time to get the correct formula in Sketch due to my programming level. Hopefully this will help others:

    float p0 = ((pres/100) * pow(1 - (0.0065 * h / (temp + 0.0065 * h + 273.15)), -5.257));
    [9]  2020/03/30 06:21   20 years old level / High-school/ University/ Grad student / Useful /
    Purpose of use
    Check own calculations made using hyposometric equation
    Comment/Request
    The ability to use different units would be nice.
    [10]  2020/03/23 03:43   20 years old level / Others / Useful /
    Purpose of use
    Weather observation.
    Comment/Request
    Please provide an option to input data in imperial units (degrees Fahrenheit, inHg, feet). Thank you.

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