Drone Battery Count 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 total flight time the job needs.
- Enter the usable flight time per battery.
- Press Calculate.
How it works
Batteries needed = total flight time ÷ usable time per battery, rounded up, plus a spare. Usable time leaves a safe landing reserve.
Worked example
75 min job, 18 min batteries. 5 batteries (6 with a spare).
Frequently asked questions
Why use 'usable' time, not rated time?
Always land with a reserve (often 20–30%). Plan on usable time, not the optimistic rated figure.
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Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.