Barometric Formula Calculator

First, calculate the temperature change based on the height, then raise it to the power determined by gravitational force, molar mass, and the gas constant. Finally, multiply by the sea-level pressure to get the result.

Barometric Formula Calculator

Enter any 3 values to calculate the missing variable

Altitude

Meters (m) Feet (ft)

Pressure at Sea Level

Pascals (Pa) Atmospheres (atm) PSI

Temperature at Sea Level

Kelvin (K) Celsius (°C) Fahrenheit (°F)

Pressure at Altitude

Pascals (Pa) Atmospheres (atm) PSI

Calculate Reset

The Barometric Formula Calculator determines atmospheric pressure at various altitudes. It uses factors such as temperature, height, and gravity to calculate pressure changes in the atmosphere. This tool is critical for professionals in meteorology and aviation.

Formula:

$$P = P_0 \times \left( 1 + \frac{L \times h}{T_0} \right)^{\frac{-g \times M}{R \times L}}$$

Variable	Description
P	Atmospheric pressure at height h
P₀	Sea-level standard atmospheric pressure
L	Temperature lapse rate (K/m)
h	Height above sea level (in meters)
T₀	Sea-level standard temperature (in Kelvin)
g	Gravitational acceleration (9.81 m/s²)
M	Molar mass of Earth’s air (0.029 kg/mol)
R	Universal gas constant (8.314 J/mol·K)

Example Calculation:

Let’s calculate the pressure at a height of 1000 meters, assuming the following values:

• $P_0 = 101325 \, \text{Pa}$
• $L = 0.0065 \, \text{K/m}$
• $h = 1000 \, \text{m}$
• $T_0 = 288.15 \, \text{K}$
• $g = 9.81 \, \text{m/s}^2$
• $M = 0.029 \, \text{kg/mol}$
• $R = 8.314 \, \text{J/mol·K}$

Using the formula:

$$P = 101325 \times \left( 1 + \frac{0.0065 \times 1000}{288.15} \right)^{\frac{-9.81 \times 0.029}{8.314 \times 0.0065}}$$ $$P = 101325 \times \left( 1 + \frac{6.5}{288.15} \right)^{\frac{-0.28449}{0.05404}} = 101325 \times (1.02256)^{-5.265}$$ $$P \approx 101325 \times 0.857 = 86867 \, \text{P$$

So, the atmospheric pressure at 1000 meters is approximately 86867 Pa.

Step by Step Calculation:

Step	Calculation	Result
1	Calculate $\frac{L \times h}{T_0}$: $\frac{0.0065 \times 1000}{288.15}$	0.02256
2	Add 1 to the result: $1 + 0.02256 = 1.02256$	1.02256
3	Multiply the constants in the exponent: $\frac{-9.81 \times 0.029}{8.314 \times 0.0065} = -5.265$	-5.265
4	Raise $1.02256$ to the power of -5.265	0.857
5	Multiply by the sea-level pressure: $101325 \times 0.857 = 86867 \, \text{Pa}$	86867 Pa

How to Calculate Barometric Pressure

The Barometric Formula Calculator is used to calculate atmospheric pressure at a given altitude using the barometric equation. 

This formula is commonly used to determine the pressure at various altitudes, such as at 25 km, and is critical in physics and meteorology. The barometric formula helps in understanding how atmospheric pressure changes with altitude, factoring in temperature and height.

Other tools like the Density Altitude Calculator and Air Pressure at Altitude Chart complement this by helping calculate air density and altitude corrections, which are essential in aviation and environmental studies. Additionally, the Barometric Formula Calculator for air pressure allows users to adjust for variations in temperature, offering more accurate results for specific conditions.

For more detailed applications, such as solving physics problems, a barometric formula calculator in physics can be used, or you can refer to a Barometric Formula PDF for the derivation and explanations of the equation.