How Much 4K Drone Footage Fits on 64GB, 128GB and 256GB?
Rough answer for typical 4K drone video at around 100Mbps: a 64GB card holds about 80 minutes, 128GB about 160 minutes, and 256GB about 320 minutes. That’s more than enough for a casual session and about three to five full batteries’ worth of continuous recording, depending on your drone. But push the bitrate up — high-quality or 4K/60 modes — and those numbers can more than halve.
So the card size you need isn’t really about the card. It’s about how you film. Here’s how the maths works, a table you can actually use, and why buying a bit bigger is nearly always the right call.
Bitrate is king — it decides everything
Recording resolution (4K) tells you the pixels. Bitrate tells you how much data per second the drone spends describing them — and that’s what fills the card. It’s measured in megabits per second (Mbps).
The rough conversion: 1 minute of video ≈ (bitrate in Mbps × 60) ÷ 8, in megabytes. So a 100Mbps clip is about 750MB per minute — three-quarters of a gigabyte a minute. A DJI Mini or Air shooting standard 4K sits around 100Mbps. Switch on a high-bitrate mode, D-Log, or 4K/60 and it climbs to roughly 150Mbps and beyond (some drones push 200Mbps), which is why the “minutes per card” figure is a range, not a fixed number.
The lesson: two people with the same 128GB card can get wildly different recording times purely from their quality settings. Resolution gets the headlines; bitrate fills the card.
Rough minutes per card size
These are practical estimates for continuous 4K recording. Real cards format to slightly less than their labelled size, and higher bitrates land you at the lower end.
| Card size | ~100Mbps (standard 4K) | ~150Mbps (high bitrate / 4K60) |
|---|---|---|
| 64GB | ~80 min | ~55 min |
| 128GB | ~160 min | ~110 min |
| 256GB | ~320 min | ~220 min |
| 512GB | ~640 min | ~440 min |
Put that against your batteries. Even a modest 64GB card holds several batteries’ worth of flying — you’ll swap packs long before you fill it. Which is the point: for most flyers, running out of card isn’t the real risk. Filling it and having nowhere to offload is. Speed still matters as much as size, so make sure whatever you buy is rated for the job — that’s covered in what SD card your drone needs.
Don’t forget RAW photos
If you shoot stills as well as video, RAW files are surprisingly hungry. A single 12MP RAW (DNG) from a DJI Mini is roughly 20–30MB; a 48MP high-res RAW can be 50–80MB or more. Fire off a 100-shot panorama or a bracketed HDR set and you’ve eaten several gigabytes without recording a second of video.
If your workflow is photo-heavy — mapping, panoramas, property stills, or inspecting your own roof with a drone — factor that in and lean toward more capacity than the video maths alone suggests.
Why buy bigger — and the one-big-card vs several question
Given how cheap storage has become, sizing up is usually the smart move for three reasons:
- Headroom. A card that’s nearly full behaves worse, and a drone straining against a packed card is more likely to throw the errors covered in our SD card error fixes guide. Leaving a card half-empty keeps it happy.
- Fewer field swaps. Changing a fingernail-sized card in the wind, over grass, with cold hands, is how cards get dropped and lost. Bigger card, fewer swaps.
- Future modes. New firmware and future drones only ever push bitrates up. A larger card ages better.
There’s a genuine debate about one big card vs several smaller ones. One big card means less fiddling and nothing to lose in the field. Several smaller cards spread the risk — if one corrupts, you’ve only lost that chunk, not the whole day. Many working pilots split the difference: a decent-sized main card, plus one spare in the case for emergencies and for isolating a suspect card. Whichever you choose, the card is never your only copy of a flight — offloading and backing up your footage the same day is what actually protects a shot you can’t reshoot.
For the specific cards and sizes worth buying by drone model, our best SD cards for drones guide lays out the current UK picks.
FAQ
How many minutes of 4K drone footage fit on a 128GB card?
Roughly 160 minutes at a standard 4K bitrate of about 100Mbps, dropping to around 110 minutes on high-bitrate or 4K/60 modes near 150Mbps. That’s several batteries’ worth of continuous recording, so most flyers will change batteries long before the card fills.
Is 64GB enough for a drone, or should I get 128GB?
64GB holds about 80 minutes of standard 4K — plenty for a casual session. But 128GB or 256GB costs little more, gives you headroom, means fewer risky card swaps in the field, and copes better with high-bitrate modes and RAW photos. For most people, sizing up is the smart, cheap call.
Why does the same card hold less footage sometimes?
Because bitrate, not resolution, decides file size. A high-bitrate mode, 4K/60, or a D-Log profile spends far more data per second than standard 4K, so the same card fills roughly twice as fast. Check your recording settings if your footage is eating space faster than expected.
Should I use one big SD card or several smaller ones?
Both work. One big card means fewer fiddly swaps and nothing to lose in the field. Several smaller cards spread the risk, so a single corruption doesn’t cost you the whole day. A common approach is one good main card plus a spare in the case — and always offload the same day either way.
Match capacity to how you fly, then pick a card that’s fast and genuine as well as big — start with the best SD cards for drones guide.