This calculator finds how many individual shots a time-lapse video needs based on its final length and frame rate, then multiplies that shot count by your interval between shots to find the real-world capture time.
Time Lapse Calculator
Number of shots needed and total real-world capture duration for a time-lapse video of a given length and frame rate.
What the Time Lapse Calculator Covers
This calculator covers time-lapse photography planning, shot count calculations, and real-world capture duration estimates — essential for planning how long you’ll need to leave a camera running to produce a time-lapse of a specific final length.
This is useful for photographers and videographers planning a sunset, construction, or nature time-lapse, letting you work backward from your desired final video length to the actual number of shots and total capture time required.
How Shots and Capture Duration Are Calculated
Formula
Shots Needed = Final Video Length (seconds) × Frame Rate (fps)
Real-World Capture Duration = Shots Needed × Interval Between Shots ÷ 3600
Where:
- Final Video Length = how long you want the finished time-lapse video to be, in seconds
- Frame Rate = the video’s frame rate, since each frame in the final video corresponds to one captured shot
- Interval Between Shots = the time between each photo capture, in seconds
Worked Example
A desired final video of 15 seconds at 24 fps, with shots taken every 5 seconds.
Shots Needed = 15 × 24 = 360 shots
Capture Duration = 360 × 5 ÷ 3600 = 1800 ÷ 3600 = 0.5 hours (30 minutes)
Capturing 360 shots at a 5-second interval requires 30 minutes of real-world shooting time to produce a 15-second final video.
Balancing Interval and Capture Duration
A shorter interval between shots captures more detail of fast-moving subjects (clouds, traffic) but requires more storage and a longer real-world capture window for the same final video length. A longer interval suits slower subjects (construction, plant growth) and needs less total shots for a similar capture duration.
Frequently Asked Questions
What interval should I use for a sunset time-lapse?
This depends on how fast the scene is changing and your desired final video length — faster-changing light (like a sunset) often benefits from a shorter interval than a slower-changing scene, but the ideal interval varies by the specific effect you want.
How do I calculate storage needed for my time-lapse?
Multiply the number of shots needed by your camera’s average file size per photo to estimate total storage required for the full capture session.
Does a higher final frame rate always mean a smoother time-lapse?
Generally, yes — more frames per second in the final video creates smoother motion, but it also requires proportionally more shots for the same final video length, increasing the real-world capture duration needed.
Can I speed up an already-captured time-lapse instead of shooting a longer one?
If you’ve already captured your shots, you can adjust the final video’s frame rate in editing to change its length, though this changes the smoothness and speed of the resulting motion compared to your originally planned interval and frame rate.
How do I estimate battery life needed for a long capture session?
Compare your calculated real-world capture duration against your camera’s rated battery life at that shooting mode, and plan for external power or a battery swap if the capture duration exceeds it.