Drone flight time calculator
Rated endurance is a hover test in still air. This works out what you will actually get, with the reserve already taken out.
Researched from published specifications and verified owner reviews · updated 2026
The short answer
Real drone flight time is normally 70 to 85 percent of the manufacturer's rated figure once you account for wind, payload and a landing reserve. Endurance in minutes is roughly (pack watt-hours x usable fraction) / hover power in watts, x 60, and hover power scales almost linearly with all-up weight.
Every drone is sold on a flight time figure that you will never see. That is not a scandal, it is a test protocol: the rated number comes from a steady hover in still air, at a comfortable temperature, on a new pack, flown down to a remaining charge no sensible pilot would accept. Your actual endurance is set by four things the marketing figure ignores, which are all-up weight, wind, how aggressively you fly, and how much charge you refuse to spend.
This calculator works from first principles rather than from a lookup table, so it works for a sub-250 g folding camera drone, a 6S freestyle quad and a heavy commercial airframe alike. Put in the pack, the weight and the wind, and it tells you the number to plan the flight around.
Endurance
Estimated flight time
Efficiency presets are hover efficiency in grams lifted per watt, which is the single number that separates an efficient folding camera drone from a racing quad. Adjust it if you know your aircraft's real figure.
Estimates from published specifications and a standard multirotor hover-power model, not from flight testing. Real endurance moves with temperature, pack age, altitude, how much you climb and how hard you accelerate. Always keep a reserve, watch the aircraft's own battery warnings rather than a calculator, and respect the manufacturer's limits. Crossing 250 g changes your registration obligations: see the weight and registration tool.
How the calculation works
Endurance is watt-hours divided by watts. That is the whole model. A pack holds a fixed amount of energy, the aircraft consumes energy at some rate to stay in the air, and the flight lasts until one runs out of the other.
Pack energy in watt-hours is capacity in amp-hours multiplied by nominal voltage. A 2590 mAh 3S pack is 2.59 Ah at 11.1 V nominal, which is 28.7 Wh. That figure, not the milliamp-hour number, is what you should compare between packs, because a 1300 mAh 6S pack at 28.9 Wh holds almost exactly the same energy as that Mini pack despite having half the milliamp-hour rating.
Hover power comes from hover efficiency, expressed as grams of lift per watt. This is the number that genuinely separates aircraft classes, and it is set by disc loading: large, slow-turning propellers move a lot of air gently and are efficient, while small, fast-turning propellers move less air violently and are not. An efficient folding camera drone achieves roughly 9 to 11 g/W in hover. A 5 inch freestyle quad on 6S manages perhaps 5 to 6 g/W. A ducted cinewhoop, which pays an efficiency penalty for the safety of its ducts, sits lower still. Divide all-up weight by that efficiency and you have hover watts.
Wind is the part most people underestimate. Holding a position against wind means tilting into it and producing horizontal thrust on top of the lift you already need, and induced drag grows with the square of airspeed. The model here blends a linear and a quadratic term, which tracks reported behaviour across the range that matters: light wind costs a few percent, 15 mph costs something like a fifth of your endurance, and past 20 mph you are into territory where the airframe, not the battery, is the limiting factor.
What all-up weight really includes
Takeoff weight means everything the motors have to lift. Pilots reliably forget the small parts. A set of Freewell All Day 6-pack ND filters (Mini 3 series) magnetic filters, a pair of VIFLY anti-collision strobe light strobes for a night operation, and a set of Propeller guard for Mini 4K, Mini 2 and Mini SE prop guards will together add somewhere between 25 and 60 g depending on what you fit, which is a meaningful fraction of a 249 g aircraft and almost nothing on a 900 g one.
Two consequences follow. The first is endurance: on a multirotor, hover power scales close to linearly with weight, so a 16 percent weight increase costs about 16 percent of your flight time. The second is regulatory, and it is the one that bites. If a 249 g aircraft crosses 250 g with accessories fitted, a recreational flight now involves a registered aircraft. Work that out before the flight, not after, with the weight and registration calculator.
Typical rated versus planned flight time
| Aircraft class | Typical pack | Rated hover | Planned at 8 mph wind, 22% reserve |
|---|---|---|---|
| Sub-250 g folding, standard pack | 2590 mAh 3S, 28.7 Wh | 31 min | 22 to 24 min |
| Sub-250 g folding, extended pack | 3850 mAh 3S, 42.7 Wh | 45 min | 31 to 34 min |
| 700 to 750 g prosumer, dual camera | 4276 mAh 4S class, 62 Wh | 45 min | 31 to 35 min |
| 950 g flagship, tri-camera | 6654 mAh 4S class, 95 Wh | 51 min | 35 to 39 min |
| Ducted cinewhoop, 380 g | 2150 mAh 4S, 31 Wh | 23 min | 14 to 17 min |
| 5 inch freestyle, 700 g loaded | 1300 mAh 6S, 28.9 Wh | n/a | 4 to 6 min of mixed flying |
The freestyle row is the outlier worth understanding. A 5 inch quad is not flown in hover, it is flown at 40 to 70 percent throttle with hard punches out, and throttle-to-power is strongly nonlinear. A pack that would hover for 11 minutes gives 4 minutes of actual freestyle. That is normal and it is why FPV pilots buy packs six at a time, for example a shelf of OVONIC 6S 1300 mAh 100C LiPo (XT60) ($31), rather than two expensive smart batteries.
Where the model will be wrong
A hover-power model is honest about averages and blind to specifics. Four things will push your real number away from the estimate.
- Pack age. Lithium polymer cells lose capacity with cycles. A pack at 200 cycles typically holds 80 to 85 percent of its original capacity, and the calculator has no way to know that. If your endurance has quietly shortened over a season, the pack is telling you something. A six dollar 1-8S LiPo cell checker with low-voltage alarm reads each cell individually and will show you a pack that is failing on one cell rather than aging evenly.
- Temperature. Cold raises internal resistance, which both wastes energy as heat and drops voltage under load so the aircraft hits its low-voltage warning sooner. Losing 10 to 25 percent in near-freezing conditions is ordinary. See flying in cold weather.
- Density altitude. Thin air means the propellers have less mass to work with, so the motors work harder for the same lift. At 8,000 ft on a warm afternoon a drone that hovers at 40 percent throttle at sea level may need 55 percent, and endurance falls accordingly. A Kestrel 3500FW weather meter reads density altitude directly.
- Flying style. Climbs are expensive, descents give almost nothing back, and repeated acceleration costs more than smooth cruising. A mapping mission flown as steady lawn mower lines is close to the model. A day of chasing a subject is not.
Turning a flight time into a battery count
Endurance per pack is only half the planning problem. The question that decides whether a shoot works is how many packs you need to carry, which depends on how much airborne time the job actually requires plus the ground time between flights. That is a separate calculation, and it is the battery count calculator.
If you are working out how much of the pack the return leg will consume, the return-to-home reserve planner handles the distance side of the same problem. For a mapping job, the mapping mission planner converts area, overlap and altitude straight into flight lines, airborne minutes and pack count. And if wind is the thing you are unsure about, the wind and airspeed margin tool compares the forecast against what the airframe can actually hold.
Buying for endurance
Two spare packs is the point at which a drone stops being a toy, because it is the point at which you stop flying to a clock. For a sub-250 g aircraft, note the trade honestly: the extended pack, such as the DJI Mini 4 Pro Intelligent Flight Battery Plus ($104), buys roughly 45 percent more airborne time and pushes the aircraft over the 250 g line. That is a fair trade for many pilots and the wrong trade for anyone who chose a 249 g aircraft precisely to stay under the threshold.
On the charging side, a DJI 30W USB-C Two-Way Charging Hub ($53) charging packs in sequence from one cable changes the shape of a field day more than any other accessory in this price range, and a Anker 737 power bank (140W, 24,000 mAh) ($110) or a Jackery Explorer 300 portable power station ($269) is what lets you keep charging when there is no wall socket within a mile. There is a full comparison in field charging and power, and the packs themselves are compared in best drone batteries.
Questions people ask
+ Why is my real flight time so much shorter than the advertised number?
Manufacturer figures are hover tests in still air at a moderate temperature, flown down to a very low remaining charge, with no payload. Real flying adds wind, climbs, acceleration, camera and gimbal load, and a landing reserve you should never spend. Between those factors, 70 to 85 percent of the rated figure is the normal range. A 45 minute rated Air 3S pack that gives you 33 usable minutes is behaving exactly as expected.
+ How much flight time does a payload actually cost?
On a multirotor, hover power scales almost linearly with all-up weight, so adding 10 percent to the takeoff weight costs roughly 10 percent of your endurance. Adding 40 g of filters, strobes and prop guards to a 249 g aircraft is a 16 percent weight increase and takes a 31 minute rating down to about 26 minutes before wind. On heavier aircraft the same absolute weight matters proportionally less.
+ What reserve should I keep?
Plan to land with 20 to 25 percent remaining and treat that as unavailable capacity, not as bonus flight time. The reserve covers the return leg into a headwind you did not have on the way out, an unplanned hold while a person or vehicle clears your landing area, and the fact that voltage sag under load makes the last 15 percent of a pack far less useful than the first 15 percent.
+ Does cold weather change the calculation?
Substantially. Lithium polymer internal resistance rises as temperature falls, so a cold pack delivers less usable energy and sags harder under load. Below roughly 5 C, expect to lose 10 to 25 percent of your endurance even with a pack that is in good health, and more if the pack is cold-soaked rather than pre-warmed. Warm packs in an inside pocket and expect the aircraft to warn earlier than usual.
+ Do more cells mean longer flight time?
Not by themselves. Endurance depends on watt-hours, which is capacity multiplied by voltage, divided by the power the aircraft needs to hover. Going from 4S to 6S at the same milliamp-hour rating raises watt-hours by 50 percent, but a 6S pack is also heavier and a 6S setup usually runs motors that pull more power. The honest way to compare packs is watt-hours per gram, not cell count.
+ Why do the first and last flights of the day feel different?
Packs perform best slightly warm, so a first flight on a cold pack often under-delivers while the third flight of a session on a pack straight off the charger performs closest to spec. Pack age matters too. Lithium polymer cells lose capacity with cycles, and a pack at 200 cycles commonly holds 80 to 85 percent of its original capacity, which shows up as a flight time that has quietly shortened over a season.
