Atmospheric Properties Calculator
Based on US Standard Atmosphere 1976
Version 2.2.0, released January 2016

The Atmospheric Properties Calculator computes conditions of the atmosphere, airspeed conversions, and basic aerodynamic quantities on a reference body. The calculator is based on methods documented in the official U.S. Standard Atmosphere 1976. This version includes the lower atmosphere below an altitude of 53.4 miles (86 km). The user interface allows conversions between common units in the English and Metric systems.

A simple method to model a non-standard day is also available. An optional temperature increment can be added or subtracted to model a hot or cold day. For example, enter "10" to see the effect of a 10° increase above the standard temperature at the current altitude.

The Atmospheric Properties Calculator requires Javascript and has been tested in Internet Explorer, Firefox, and Chrome. If the Results are blank, make sure Javascript is enabled in your browser settings.

If you find any problems with this calculator or have any questions or suggestions for improvement, please contact us.

Unit System
Reference Length
Temperature Increment
(use only for Non-Standard Day)

This section requires altitude only
Atmospheric Layer
Geometric Altitude
Geopotential Altitude
Acceleration of Gravity
Mean Molecular Weight
Kinetic Temperature
Molecular Temperature
Speed of Sound
Dynamic Viscosity
Kinematic Viscosity
Coefficient of Thermal Conductivity
Pressure Scale Height
Density Scale Height
Total Number Density
Mole Volume
Mean Air Particle Speed
Mean Collision Frequency
Mean Free Path

This section requires altitude and velocity
True Airspeed
Calibrated Airspeed
Equivalent Airspeed
Airspeed Compressibility Correction
Mach Number
Equivalent Mach Number
True Dynamic Pressure
Compressible Dynamic Pressure
Total Head
Critical Pressure Coefficient (Cp,cr)
Vacuum Pressure Coefficient (Cp,min)
Laminar Recovery Temperature
Turbulent Recovery Temperature
Total Temperature
Reynolds Number / Unit Length

This section requires altitude, velocity, and reference length
Reynolds Number
Laminar Boundary Layer Thickness
Laminar Displacement Thickness
Laminar Coefficient of Friction (Cf)
Turbulent Boundary Layer Thickness
Turbulent Displacement Thickness
Turbulent Coefficient of Friction (Cf)

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