Photography Math: Exposure, Depth of Field and Crop Factor
The numbers that sharpen your photography — the exposure triangle, exposure value, depth of field and hyperfocal distance, crop factor, flash guide numbers and print size.
Time Lapse Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Final clip length
30.0
- Number of frames
- 720
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Time Lapse Calculator
The Time Lapse Calculator works out your final clip length, along with 1 related figure in an instant. Enter shooting duration, interval between shots and playback frame rate and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the shooting duration.
- Enter the interval between shots.
- Enter the playback frame rate.
- Read off your final clip length, together with number of frames — the calculator updates automatically, with no button to press.
Formula
The Time Lapse Calculator uses the formula:
Final clip length = Shooting duration × 60 ÷ Interval between shots ÷ Playback frame rate
Worked example
For example, with shooting duration of 60 minutes, interval between shots of 5 seconds and playback frame rate of 24 fps, the final clip length is 30.0.
| Shooting duration | 60 minutes |
|---|---|
| Interval between shots | 5 seconds |
| Playback frame rate | 24 fps |
| Final clip length | 30.0 |
|---|---|
| Number of frames | 720 |
Results are estimates for educational use, not professional advice.
Frequently asked questions
Divide the total frames (shooting time ÷ interval) by the playback frame rate. One hour at 5-second intervals at 24 fps gives a 30-second clip.
Frames equal the shooting duration in seconds divided by the interval. One hour at 5 seconds is 720 frames.
Short intervals (1–3 s) suit fast scenes like traffic; longer ones (10–30 s) suit slow changes like clouds or sunsets.
24 or 30 fps gives smooth playback. A higher frame rate needs more frames for the same clip length.
The Time Lapse Calculator uses the formula: Final clip length = Shooting duration × 60 ÷ Interval between shots ÷ Playback frame rate. For example, with shooting duration of 60 minutes, interval between shots of 5 seconds and playback frame rate of 24 fps, the final clip length is 30.0.
Enter the shooting duration. Enter the interval between shots. Enter the playback frame rate. Read off your final clip length, together with number of frames — the calculator updates automatically, with no button to press.
Related guides
Time Lapse Table: Final clip length by Shooting duration
Reference table of final clip length for Time Lapse across a range of shooting duration values — exact, engine-computed figures you can read off at a glance.
How to Calculate Time Lapse: Formula, Steps & Examples
Learn how to calculate Time Lapse — the formula explained step by step, with worked examples and a free calculator to check your answer.