How is clip length calculated?

Clip length in seconds equals the number of photos divided by the output frame rate. For example, 240 photos at 24 fps produces a 10-second clip.

What is the speed-up factor?

The speed-up factor is total real time divided by clip time. If you captured 2 hours (7200 s) of real time and the clip is 60 s, the footage plays at 120× real speed.

What interval should I use?

For fast-moving clouds, 2–5 seconds works well. For sunsets, 5–10 seconds. For slow subjects like plants or construction, 5–60 minutes. See the interval reference table below.

Which frame rate should I choose?

24 fps gives a cinematic look. 25 fps matches PAL video standards. 30 fps is standard for web and social media. 48 and 60 fps produce smoother motion but require more photos for the same duration.

Why does my clip feel too short?

A short clip usually means too few photos or too high a frame rate. Shoot more frames, use a shorter interval, or reduce playback fps to lengthen the clip.

Does this tool store any data?

No data is sent to a server. All calculations happen in your browser.

Time-Lapse Clip Length Calculator

Enter your photo count, shooting interval, and output frame rate to find the final clip length, total real time captured, and speed-up factor.

Time-Lapse Settings

Calculation Mode

Enter photo count and interval to get clip length.

Number of Photos

Total frames captured during the shoot.

Shooting Interval (seconds)

Seconds between each photo.

Output Frame Rate (fps)

Enter your settings and click Calculate.

Interval Reference Table

Interval	Typical Use Case	Photos / Hour	Clip @ 30 fps / Hour

Summary

A time-lapse clip length calculator takes your total photo count, the interval between shots, and the playback frame rate, then tells you how long the final video will be, how much real time was captured, and by how much the footage is sped up. Use the reverse mode to work backward: enter a target clip duration and interval to find out how many photos you need to shoot.

How it works

Select the calculation mode: photos-to-clip or clip-to-photos.
Enter the number of photos (or target clip length if working in reverse).
Set the shooting interval — how many seconds elapse between each photo.
Choose your output frame rate: 24, 25, 30, 48, or 60 fps.
Read the final clip length, total real time captured, and speed-up factor in the results panel.
Consult the interval reference table at the bottom for typical use cases.

Use cases

Plan a sunset time-lapse and know exactly how long your final clip will be before you shoot.
Work out how many photos you need to fill a 10-second slot in an edit.
Estimate battery life and storage needed by knowing total real shooting time.
Compare speed-up factors across different intervals to match creative intent.
Teach students the relationship between interval, frame count, fps, and final duration.
Plan construction or plant-growth time-lapses that span hours or days.

Frequently Asked Questions

Last updated: 2026-06-15 · Reviewed by Nham Vu