AVIATION & AERONAUTIC CALCULATOR
Altimeter Setting
A precise tool.
What is the Altimeter Setting & How does it work?
An altimeter is an instrument used to measure altitude above sea level. It works by measuring the atmospheric pressure, which decreases with increasing altitude.
P = P_0 cdot e^{-frac{gMh}{RT}}
P = pressure at altitude h, P_0 = sea level pressure, g = acceleration due to gravity, M = molar mass of air, R = universal gas constant, T = temperature
Altimeter settings are typically given in either hectopascals (hPa) or inches of mercury (inHg). Converting between these units is essential for accurate altitude readings.
Parameters
Result
—
Frequently Asked Questions
How do I convert inches of mercury to hectopascals?
To convert inches of mercury (inHg) to hectopascals (hPa), multiply the inHg value by 33.86.
What is the standard sea level pressure in hPa?
The standard sea level pressure is approximately 1013.25 hPa or 29.92 inches of mercury (inHg).
How does temperature affect altimeter readings?
Temperature affects altimeter readings because it influences the density of air, which in turn affects atmospheric pressure.
Can I use this calculator for non-aviation purposes?
While primarily used in aviation, this calculator can be useful for any application requiring altitude measurement based on atmospheric pressure.
What is the formula used to calculate altitude from pressure?
The formula used is P = P_0 * e^(-gMh/RT), where P is pressure at altitude h, P_0 is sea level pressure, g is gravity, M is air molar mass, R is gas constant, and T is temperature.
How accurate are altimeter readings?
Altimeter readings can be affected by factors such as temperature variations and atmospheric conditions, leading to potential inaccuracies of several hundred feet.
What should I do if my altimeter is not reading correctly?
If your altimeter is not reading correctly, ensure it is set to the correct altimeter setting for your location and check for any recent changes in weather conditions that could affect atmospheric pressure.
Results are for informational purposes only and do not constitute professional advice.