ISA Calculator
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Enter one property to calculate the others based on the International Standard Atmosphere model. Note: Calculating from temperature is only valid in the Troposphere.
Results:
Altitude
1000.0 m / 3281 ft
Temperature
281.65 K / 8.50 °C / 47.30 °F
Pressure
89874 Pa / 898.74 hPa / 0.8870 atm / 0.8987 bar
Density
1.1117 kg/m³
Atmospheric Layer
Troposphere
Interactive Standard Atmosphere
100 km
0 km
Tropopause(11 km)
Stratopause(20 km)
Stratopause(32 km)
Stratopause(47 km)
Mesopause(51 km)
Mesopause(71 km)
Mesopause(85 km)
Troposphere
Tropopause
Stratosphere I
Stratosphere II
Stratopause
Mesosphere I
Mesosphere II
Mesopause
-100°CTemperature Profile20°C
Hover over the chart to see ISA values at different altitudes.
Open Source and Easy to Use Elsewhere
This tool is open source and the underlying logic is fully transparent. You can inspect the code, understand the calculations, and contribute improvements. If you want to use the tool in your own website, course page, or learning platform, you can also embed it directly and start from a ready-made iframe setup for this exact tool.
Open source: review the implementation and see how the results are produced.
Embeddable: preview this tool, copy the iframe, and use it in your own site or LMS.