TC Calculator

TC Calculator converts between SMPTE timecode, frame counts, and duration. It is useful for quick show math — looking up a timecode for a specific bar or beat, or calculating how long a segment runs.

Accessing TC Calculator

Open the Tools tab in the right panel and click TC Calculator. The calculator is a standalone tool and does not affect playback.

Frame rate selection

Before entering values, select the frame rate to match your show: 24, 25, 29.97 DF (drop-frame), or 30 fps. The calculation changes with the frame rate — especially for 29.97 DF, which uses drop-frame counting. Select the wrong frame rate and the results will be incorrect.

Timecode to frames

Enter a SMPTE timecode in HH:MM:SS:FF format. TC Calculator instantly shows the equivalent total frame count. Use this when a console or software requires a frame-based offset rather than a SMPTE address.

Frames to timecode

Enter a frame count. TC Calculator shows the equivalent SMPTE timecode. Use this when a manufacturer specification gives an offset in frames that you need to enter into LTCast as a SMPTE address.

Duration calculator

Enter a start timecode and an end timecode. TC Calculator shows the duration between them in seconds and in frames. If the end is earlier than the start, the result wraps — check that both timecodes are on the same 24-hour cycle.