Drone Battery Endurance Calculator
Realistic flight minutes from battery capacity, voltage, power draw and reserve — plus batteries needed for a mission.
Endurance = (Wh ÷ average draw) × 60, minus the reserve you land with. The brochure number assumes a new pack hovering in still air; your mission doesn't.
Average draw varies with payload, wind and speed — measure yours from flight logs (energy used ÷ flight time) rather than trusting specs.
With your numbers: A 5,880 mAh pack at 15.4 V holds 90.55 Wh; at 230 W average draw with a 25% reserve that's 17.72 usable minutes — so a 45-minute mission needs 3 batteries.
⚠️ Not for operational decisions. This is a record-keeping and planning aid only — not certified avionics, not a source of regulatory truth. Always verify against official sources (FAA) and your operator's approved documents before flying.
Free drone battery endurance calculator: capacity, voltage and real power draw in — usable minutes and mission battery count out, with the landing reserve professionals actually keep.
About Drone Battery Endurance Calculator
Flight-time arithmetic is energy bookkeeping: capacity (mAh) times voltage gives watt-hours; divide by average power draw for gross minutes; subtract the landing reserve you're disciplined about, and that's your usable endurance. The gap between this number and the brochure's is where missions fail — spec sheets quote a new pack, no payload, no wind, hovering, landing at near-empty. Real operations carry sensors, fight wind, fly survey speeds and land at 25-30% (both for safety margin and because deep discharge ages lithium packs fast). This calculator runs the honest version, then converts mission duration into batteries needed. Feed it average draw measured from your own flight logs and the output becomes reliable enough to plan site visits on.
How to use Drone Battery Endurance Calculator
- 1Enter pack capacity and nominal voltage (cells × 3.7 V less sag, or the label).
- 2Set average draw — measured from your logs if possible — and your reserve.
- 3Read usable minutes; enter mission length for the battery count.
Why use Drone Battery Endurance Calculator?
- ✓Energy math with the reserve discipline professionals fly
- ✓Batteries-per-mission output for site planning
- ✓Works for any platform: multirotor, fixed-wing, payload configs
- ✓Encourages measured draw over brochure figures
- ✓Instant, free, browser-only
Frequently asked questions
How do I measure my drone's real average power draw?+
From flight logs: most platforms record per-flight energy or capacity consumed — divide watt-hours used by flight hours (or mAh by minutes, then convert with voltage) across several representative flights. A mapping flight with payload in 8 m/s wind draws meaningfully more than a calm hover test; using YOUR operation's average is what makes endurance predictions trustworthy.
Why land with 25-30% remaining instead of flying packs down?+
Two compounding reasons: safety margin (wind on return, go-arounds, GPS-denied landings all consume reserve you can't buy back airborne) and chemistry (lithium packs cycled to deep discharge lose capacity dramatically faster — the difference between 200 and 500 useful cycles). The reserve isn't wasted energy; it's the cheapest insurance and battery-life program you have.
How does cold weather change these numbers?+
Hard: lithium chemistry delivers less usable capacity below ~15°C and sags badly near freezing — practical endurance losses of 15-30% are routine in winter, worse with cold-soaked packs. Mitigations: keep packs warm until launch (insulated bag, pocket), increase the reserve percentage in this calculator for winter planning, and watch the first battery's telemetry to calibrate the day before committing the mission schedule.
Where is this data stored?+
Everything you enter is saved in your browser's local storage on your own device — nothing is uploaded to any server. Your records stay completely private, work offline, and load instantly. Use the CSV export regularly to keep an off-device backup copy.
What format does the export use and what reads it?+
A plain CSV with one row per entry and labelled column headers — the most portable format there is. Spreadsheets open it directly, most specialised software can map it on import, and a printed copy is perfectly legible to a human reviewer. Nothing proprietary means your endurance plan is never trapped here.
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