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True Airspeed Calculator
Calculate true airspeed from calibrated airspeed, pressure altitude and temperature.
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True airspeed
Compare Your Options And Get Clear Answers
Calculate true airspeed from calibrated airspeed, pressure altitude and temperature.
True Airspeed Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: TAS = CAS x sqrt(rho0 / rho), rho from pressure altitude and OAT.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
True Quick Guide
Typical values for reference.
| CAS kt | Altitude ft | OAT C | TAS |
|---|---|---|---|
| 120 | 0 | 15 | 120 kt |
| 120 | 5000 | 5 | 129 kt |
| 120 | 10000 | -5 | 140 kt |
| 120 | 15000 | -15 | 151 kt |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
True Airspeed Calculator FAQ
Answers to common questions about this calculator.
Your actual speed through the air.
The air is thinner at altitude.
About 2 percent more per 1,000 feet.
No. Use approved tools.