How to use this calculator
- Enter Va. Use the maneuvering speed to check.
- Enter load factor. Use the relevant positive limit load factor.
- Read inferred Vs. The calculator divides Va by the square root of n.
- Verify configuration. Compare with approved stall-speed data.
How it works
This page reverses Va = Vs x sqrt(n) into Vs = Va / sqrt(n).
Use it with load factor from Va, maneuvering speed and stall margin.
Worked example
Verified against the live calculator
A 105 kt Va with a 3.8 g limit load implies Vs = 105 / sqrt(3.8) = 53.9 kt.
Frequently asked questions
How do you calculate stall speed from Va?
Use Vs = Va / sqrt(n), where n is the positive limit load factor.
Is the result a POH stall speed?
No. It is an inferred value from the entered Va and load factor.
Which load factor should I enter?
Use the approved positive limit load factor for the aircraft and category you are checking.
Why does this reverse calculator help?
It helps compare published speeds with the square-root Va relation.
Method & assumptions
- Assumes the entered Va and limit load factor describe the same envelope point.
- Does not include calibration, certification definitions, configuration changes or aircraft-specific corrections.