Timecode duration calculator

Define what the out point means.

Both marks must belong to the same continuous timebase. An end offset excludes the out picture; an inclusive out includes it.

The same marks can describe two lengths.

The default marks are 90 frames apart. Excluding the out picture gives 90 frames, 00:00:03:18, or 3.750 seconds at 24 fps. Including that picture gives 91 frames, 00:00:03:19, or approximately 3.792 seconds. Identical in and out marks give zero frames with an exclusive out and one with an inclusive out.

Confirm the convention used by your editing tool or turnover format. A source timecode origin of one hour does not add an hour to the selection. See the timecode duration guide for the full worked method.

Declare a wrap. Do not infer one.

At 24 fps, 23:59:59:20 to next-day 00:00:00:10 is 14 frames with an exclusive out, or 15 with an inclusive out. The checkbox adds one complete timecode-day cycle. It does not establish continuity or recover missing dates from two labels.

A timecode day means the full 00–23-hour label cycle in the chosen counting mode. It is not a guarantee of a wall-clock midnight boundary: fractional-rate NDF cycles and even DF cycles differ from exactly 86,400 physical seconds. Confirm the recording system’s wrap behaviour and source continuity before using the next-day option.

One boundary can hide skipped labels.

At 29.97 DF, 00:00:59;29 to 00:01:00;02 is one frame apart, so the exclusive duration is one frame. Two labels are skipped at that minute boundary; no pictures are removed. At 59.94 DF this calculator uses full-rate 60-count labels and skips four opening labels at the corresponding minutes. Read the drop-frame guide for the full rule.

Seconds use exact rates: 24000/1001, 30000/1001 or 60000/1001 for fractional options. This calculator does not automatically align different rates, different sources, discontinuous recordings or multiple day wraps. Establish a common timebase before comparing those marks.