Drone GSD Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserIntermediate
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the sensor width, focal length, image width (px) and flight altitude.
- Press Calculate.
- Read the ground sample distance.
How it works
GSD = (sensor width × altitude) ÷ (focal length × image width). A lower GSD means finer detail per pixel.
Worked example
13.2 mm sensor, 8.8 mm, 5472 px, 100 m. ≈ 2.7 cm/px.
Frequently asked questions
What GSD do I need?
It depends on the deliverable — mapping often targets 2–5 cm/px; detailed inspection wants 1 cm/px or finer.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.