Drone Flight Time Calculator
Estimate flight duration from battery capacity, payload weight, and wind conditions. Plan safe mission endurance.
About this calculator
A drone's flight time comes down to a simple ratio: how much usable energy the battery holds, divided by how fast the motors draw it down. This calculator starts from the pack's rated capacity, reserves 20% as a safety margin most pilots never plan to fully discharge, and divides that usable capacity by the current draw estimated for the mission. Current draw itself scales with total weight — adding payload increases how hard the motors work relative to hovering the bare airframe, modeled here as a straightforward ratio of loaded to unloaded weight — and with wind, which the calculator treats as adding roughly 3% more power draw per additional meter-per-second, a simplification of the real aerodynamic penalty that also depends on airframe shape and flight direction relative to the wind.
Because flight time depends on current draw rather than on pack voltage directly, raising the voltage of an equivalent-capacity pack (moving to a higher cell-count LiPo, for instance) does not by itself change the estimated flight time here — voltage instead determines total energy and power output. Treat this as a planning estimate: real flight time is also affected by aggressive maneuvering, temperature, battery age and internal resistance, and altitude, none of which this simplified model captures.
Inputs
Results
Estimated Flight Time
12.7 min
How to Use This Calculator
- Enter battery capacity (mAh), battery voltage, and hover current draw from your drone's specification.
- Set drone weight without payload and payload weight for the planned mission.
- Enter current wind speed to account for increased power in headwind conditions.
- Review estimated flight time (min), maximum no-load flight time, and total power consumption (W).
- Reserve at least 20–25% battery for emergency return — plan missions to land at 30% remaining.
How the result changes with Battery Capacity
| Battery Capacity | Estimated Flight Time |
|---|---|
| 2,600 | 6.4 min |
| 3,900 | 9.5 min |
| 7,800 | 19.1 min |
| 13,000 | 31.8 min |
What each input means
- Battery Capacity
- Battery capacity in milliamp-hours.
- Battery Voltage
- Nominal battery voltage (e.g., 6S LiPo = 22.2V).
- Hover Current Draw
- Current draw while hovering with no payload.
- Drone Weight (no payload)
- All-up weight of the drone without payload, including battery.
- Payload Weight
- Weight of camera, sensor, or cargo payload.
- Wind Speed
- Average wind speed during the flight.
How this is calculated
Worked example, using the default values
- Identify Input Parameters6 parametersBattery Capacity = 5200, Battery Voltage = 22.2, Hover Current Draw = 15, Drone Weight (no payload) = 2500, Payload Weight = 500, Wind Speed = 3 = 6 input(s) provided
- Calculate Estimated Flight TimeEstimated Flight Time12.7 = 12.7
- Calculate Max Flight TimeMax Flight Time16.6 = 16.6
- Calculate Adjusted Current DrawAdjusted Current Draw19.62 = 19.62
Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does the calculator reserve 20% of the battery as unusable?
LiPo batteries lose voltage and performance sharply as they approach full discharge, and flying them down to empty risks a sudden power loss or permanent battery damage. Reserving 20% of rated capacity models the safety margin most pilots build into mission planning so the aircraft lands with the pack still healthy rather than critically depleted.
Why doesn't increasing battery voltage change the estimated flight time?
This calculator computes flight time from usable battery capacity divided by current draw, and neither of those two figures depends on pack voltage directly in this model — voltage instead determines total energy (watt-hours) and power output. A separate hover current figure is what actually drives the flight time result here, so changing voltage alone does not move it.
How much does payload weight actually reduce flight time?
The calculator scales current draw by the ratio of loaded weight to the drone's unloaded weight, so a payload equal to 20% of the airframe's own weight increases current draw by roughly 20%, which cuts flight time by a comparable share. Heavier base airframes are proportionally less affected by the same payload weight than lighter ones.
Is the wind speed penalty realistic?
It is a simplified approximation — roughly 3% more power draw per additional meter-per-second of wind — rather than a full aerodynamic model. Real wind impact also depends on the aircraft's shape, whether it is flying into or with the wind, and gust behavior, so treat the wind-adjusted flight time as directional guidance rather than a precise mission-planning figure.
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