What is Drop-Frame (DF) timecode vs Non-Drop Frame (NDF)?

At 29.97 FPS, NDF timecode drifts from real clock time by ~108 frames per hour. Drop-Frame (DF) timecode (using semicolons `01;00;00;00`) skips frame numbers 00 and 01 at the start of every minute except every 10th minute to keep timecode synchronized with real clock time.

Does Drop-Frame timecode actually drop video frames?

No! Drop-Frame timecode only skips numbering labels, never actual video pictures. All 29.97 images per second remain intact.

How many milliseconds is 1 frame at 24 FPS?

At 24 FPS, 1 frame lasts `1000 / 24 = 41.666 milliseconds` (at 60 FPS, 1 frame is 16.666 ms).

What is the standard cinema frame rate?

Standard cinema theatrical projection and production frame rate is 24.000 FPS (or 23.976 FPS for US broadcast cinema mastering).

How do you calculate duration between In-Point and Out-Point?

Subtract the In-timecode from the Out-timecode: `Duration = Out - In + 1 frame` (in inclusive video editing).

Media Calculators Cluster

Video Timecode Calculator (SMPTE Timecode Math & Frame Counts)

Perform arithmetic on SMPTE timecodes, convert timecodes to frames and milliseconds across standard frame rates.

TL;DR: Video Timecode Calculator provides SMPTE timecode arithmetic (addition, subtraction, frame duration) across non-drop frame and drop-frame television/cinema standard frame rates.

Timecode (HH:MM:SS:FF)

Frame Rate (FPS)

How Do You Convert SMPTE Timecode (HH:MM:SS:FF) to Total Frames?

For non-drop frame timecode: Total Frames = (Hours × 3600 + Minutes × 60 + Seconds) × FPS + Frames. For example, at 24 FPS, timecode 01:15:30:12 = (1 × 3600 + 15 × 60 + 30) × 24 + 12 = 4,530 × 24 + 12 = 108,732 frames.

How to Use the Video Timecode Calculator

Our Video Timecode Calculator performs high-precision mathematical operations directly in your browser with zero latency and complete client-side privacy.

Select your production frame rate (23.976, 24, 25, 29.97 DF, 29.97 NDF, 30, 50, 59.94, 60 FPS).
Enter Timecode 1 and Timecode 2 in `HH:MM:SS:FF` format.
Select operation: Add (+), Subtract (-), or Convert to Frames/Milliseconds.
Review the resulting SMPTE timecode, total frames, and exact real-world duration.
Copy timecodes for editing EDL/XML conform workflows in Premiere, Final Cut Pro, or Avid.

100% Client-Side Privacy Guarantee

All calculations run locally inside your browser using JavaScript and client math engines. Your numbers, dates, values, and financial records are never transmitted to or stored on external servers.

Frequently Asked Questions

: At 29.97 FPS, NDF timecode drifts from real clock time by ~108 frames per hour. Drop-Frame (DF) timecode (using semicolons `01;00;00;00`) skips frame numbers 00 and 01 at the start of every minute except every 10th minute to keep timecode synchronized with real clock time.
: No! Drop-Frame timecode only skips numbering labels, never actual video pictures. All 29.97 images per second remain intact.
: At 24 FPS, 1 frame lasts `1000 / 24 = 41.666 milliseconds` (at 60 FPS, 1 frame is 16.666 ms).
: Standard cinema theatrical projection and production frame rate is 24.000 FPS (or 23.976 FPS for US broadcast cinema mastering).
: Subtract the In-timecode from the Out-timecode: `Duration = Out - In + 1 frame` (in inclusive video editing).

Cite This Tool

Referencing this calculator in a research paper, article, or classroom assignment? Copy a citation below.

NexLove.org. (2026). Video Timecode Calculator [Software]. https://nexlove.org/tools/video-timecode-calculator.html

“Video Timecode Calculator.” NexLove.org, 2026, nexlove.org/tools/video-timecode-calculator.html.

NexLove.org (2026) Video Timecode Calculator. Available at: https://nexlove.org/tools/video-timecode-calculator.html (Accessed: 2026).

@misc{nexlove_video_timecode_calculator,
  title = {Video Timecode Calculator},
  author = {{NexLove.org}},
  year = {2026},
  url = {https://nexlove.org/tools/video-timecode-calculator.html}
}

Embed This Tool

Add the live Video Timecode Calculator to your own website with this snippet — it loads the real, working calculator in an iframe.

<iframe src="https://nexlove.org/embed/video-timecode-calculator.html" width="100%" height="600" style="border:1px solid #e2e8f0;border-radius:12px" title="Video Timecode Calculator — NexLove.org" loading="lazy"></iframe>