# 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)
 at present location: Altitude h m Atmospheric pressure P hPa Temperature T °C 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit Sea-level pressure P0 hPa = atm
 $\normal Sea-level\ pressure\\\vspace{5}\hspace{20}P_0=P\left(1-{\large\frac{0.0065h}{T+0.0065h+273.15}}\right)^{-5.257}$
Conversion to sea-level pressure
 [1-10] /83 Disp-Num5103050100200
[1]  2019/01/10 04:21   Male / 50 years old level / An office worker / A public employee / Very /
Purpose of use
weather station calibration
[2]  2019/01/04 21:25   Male / 60 years old level or over / A retired person / Very /
Purpose of use
Check calibration of mercury barometer
[3]  2018/12/18 08:03   Male / 30 years old level / An office worker / A public employee / Very /
Purpose of use
Entering in offsets for field pressure equipment
Comment/Request
Thank you!
[4]  2018/07/20 03:27   Male / 50 years old level / An engineer / Useful /
Purpose of use
weather calc
Comment/Request
using the shown formula i come up with a different answer with the same inputs. using p=1012.265, h=105, t=17.19 the website calculates 1024.84. running the formula by hand and in excel i get 1004.6341. any ideas where the error is?
from Keisan
We have tried it in excel, but the result was same.(1024.84)
[5]  2018/07/08 03:39   Male / 40 years old level / An engineer / Very /
Purpose of use
Calibrate BME280 sensor connected to NodeMCU ESP8266 module. Used altitude data from maps https://www.daftlogic.com/sandbox-google-maps-find-altitude.htm + temperature reading from the sensor itself and compared to the closest airport data http://tgftp.nws.noaa.gov/weather/current/SBSP.html , less than 1 Km away.
Comment/Request
Thanks!
[6]  2018/06/22 11:19   Male / 40 years old level / An engineer / Very /
Purpose of use
Calibrate BME280 Sensor sent to Blynk via MKR1000 Arduino Board
Comment/Request
Great tool! Thanks.
[7]  2018/04/27 09:07   Male / 60 years old level or over / A retired people / Very /
Purpose of use
calibrate home weather station
Comment/Request
it disagreed with BOM MSLP isobars by a couple of hpa but close enough for my needs, thanks for a great conversion tool!
[8]  2018/01/19 04:04   Male / 40 years old level / Self-employed people / Very /
Purpose of use
Adjust watch barometer to compare with marine weather forecast
[9]  2018/01/14 02:33   Male / 60 years old level or over / A retired people / Very /
Purpose of use
Checking my conversion formula from a BME180 sensor.
[10]  2018/01/13 23:55   Male / 40 years old level / An engineer / Very /
Purpose of use
WEATHER STATION

Sending completion

To improve this 'Conversion to sea-level pressure Calculator', please fill in questionnaire.
Male or Female ?
Male Female
Age
Under 20 years old 20 years old level 30 years old level
40 years old level 50 years old level 60 years old level or over
Occupation
Elementary school/ Junior high-school student
High-school/ University/ Grad student A homemaker An office worker / A public employee
Self-employed people An engineer A teacher / A researcher
A retired person Others
Useful?
Very Useful A little Not at All
Purpose of use?