Free drone flight time calculator. Enter battery capacity and current draw to find estimated flight minutes at 80 percent usable capacity.
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Convert milliamp hours to amp hours, divide by current draw for hours, multiply by 60 for minutes, and keep 80 percent as usable capacity. A 5000 mAh battery at 20 amps gives about 12 minutes of flight time, which is the safe estimate, not the full capacity figure.
Flight time is battery energy divided by power draw. Keeping 20 percent in reserve protects the battery and leaves a landing margin, so only 80 percent counts as usable. Convert mAh to amp hours by dividing by 1000, divide by amps for hours, and multiply by 60 for minutes. A 5000 mAh battery is 5 amp hours, 80 percent of that is 4 amp hours, and 4 divided by 20 amps is 0.2 hours, which is 12 minutes. This drone flight time calculator is an estimator: real flights vary with wind, payload, and battery age.
At a fixed 20 amps with 80 percent usable capacity, a 3000 mAh battery gives about 7.2 minutes, 4000 mAh gives 9.6 minutes, 5000 mAh gives 12 minutes, 6000 mAh gives 14.4 minutes, and 10000 mAh gives 24 minutes. On a fixed 5000 mAh battery, 10 amps gives 24 minutes, 15 amps gives 16 minutes, 20 amps gives 12 minutes, 25 amps gives 9.6 minutes, and 40 amps gives 6 minutes. Flight time scales with capacity and falls sharply as current draw rises, which is why aggressive flying cuts flight time far more than a small capacity increase restores it.
Pilots typically land with 15 to 25 percent of capacity still in reserve. The 80 percent rule means you plan on 80 percent usable and keep 20 percent as a buffer. Draining a LiPo battery close to empty shortens its usable lifespan and risks a forced landing if the return leg takes longer than planned. A full capacity figure is useful as a theoretical ceiling, but plan missions, battery swap planning, and return legs on the reserve figure, never on the full figure.
Average current draw in amps is the hardest input to guess well. A watt meter between battery and aircraft gives a bench reading, and flight controller logs from Betaflight, ArduPilot, or iNav give the most accurate average for your flying style. A simple hover test also works: hover for a set time, land, and check how many mAh the charger puts back, then scale that to an hourly draw. Always measure with the payload fitted, because a camera or sensor raises the draw for the whole flight.
A quadcopter battery lasts longer in calm, warm air than in cold wind, because wind and cold both raise the energy needed to stay airborne. Payload weight raises current draw, because the motors work harder to stay airborne, so a larger battery does not always mean a longer flight if the extra weight raises the draw. Wind forces the drone to fight to hold position, cold weather reduces battery efficiency, and an old battery holds less than its printed capacity. FPV drones are the sharpest example: a 1300 mAh pack flown hard may last only 3 to 5 minutes, while the same pack flown gently can last 8 to 10 minutes. Treat every result as a planning estimate and keep a margin for the return leg.
Voltage comes from cell count: each LiPo cell is about 3.7 volts nominal, so 3S is about 11.1 volts, 4S is about 14.8 volts, and 6S is about 22.2 volts. Voltage sets the power system, but the flight time formula needs capacity and current draw, not voltage alone. To fly longer, reduce weight, fly smoothly, avoid rapid throttle changes, keep batteries warm in cold weather, and carry a spare pack with a planned swap time of 1 to 2 minutes, rather than pushing one pack to empty.
Draining a lithium battery fully damages it and leaves no landing margin. Keeping 20 percent in reserve extends battery life and keeps flights safe when the return leg takes longer than planned.
Payload weight, aggressive manoeuvres, high throttle, strong wind, and larger or more aggressive propellers all raise average current draw. Measure the draw with the payload fitted, because an unloaded figure understates a real mission.
Most consumer drones last 15 to 30 minutes per charge, while hard flown FPV drones may last only 3 to 5 minutes on a small pack. Capacity, weight, wind, cold, and battery age all shift the real figure away from the calculated estimate.
No. Without average current draw, you are missing the most important input. Voltage tells you about the power system, but flight time needs capacity divided by current draw, with a reserve margin applied.
No. A bigger battery adds weight, which raises current draw. Compare the new capacity and the new draw together: if the draw rises as fast as the capacity, flight time barely changes.
It is a planning estimate, not a guarantee. Accuracy depends on the current draw figure you enter. Real world wind, temperature, payload, and battery health can move the result by minutes, so always keep a landing reserve.
Reduce payload weight, fly smoothly, use efficient propellers, keep batteries warm in cold weather, and land with reserve. Carry a spare battery and plan the swap, rather than stretching one pack to empty.