Flight Altitude from GSD Calculator
Works out the flight altitude needed to achieve a target ground sample distance.
Enter Values
Before you rely on this: First-pass guide only. Verify safety-critical or regulated work against the relevant standards, your project requirements and a qualified professional.
How to use this calculator
- Enter the target GSD, sensor width, focal length and image width.
- Press Calculate.
- Read the flight altitude needed.
How it works
Altitude = (GSD × focal length × image width) ÷ sensor width — the inverse of the GSD formula.
Worked example
2 cm/px target. Tells you how high to fly to achieve it for your camera.
Frequently asked questions
Check the legal height limit?
Yes — many countries cap drone altitude (often 120 m / 400 ft). If the result exceeds your limit, use a longer lens or accept a coarser GSD.
Related tools
- Drone GSD Calculator
- Photogrammetry Accuracy Estimate Calculator
- Drone Flight Line Spacing Calculator
- Image Footprint Calculator
- Drone Battery Count Calculator
- Drone Image Count Calculator
Explore more in Surveying, Coordinates, GIS & CAD.
Cite this tool
Zerdly. (2026). Flight Altitude from GSD Calculator. Retrieved from https://www.zerdly.com/tools/flight-altitude-from-gsd-calculator/
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.