SMPTE Timecode Calculator

The hours, minutes and seconds are converted to whole seconds and multiplied by the frame rate, then the frame field is added on top. For 00:01:30:00 at 24 fps that is 90 seconds times 24, which gives 2160 frames.

Non-drop-frame counts every frame in sequence with no numbers skipped, so the timecode label and the real frame index always agree. It is the simplest scheme and the only one this calculator uses.

No. Drop-frame skips two frame numbers at the start of most minutes to keep the running time close to a real clock at 29.97 fps. This tool models non-drop-frame only, so its output will drift from a drop-frame reference over long durations.

The menu offers 23.976, 24, 25, 29.97, 30, 50 and 60 fps. The math treats each rate as a plain divisor, so a fractional rate like 23.976 still produces exact frames and seconds without drop-frame corrections.

Frames are numbered from 0 up to one less than the rate. At 24 fps the frame field runs 0 to 23, so entering 24 would really be the first frame of the next second and the tool flags it.

Not directly, but you can do it in one step. Multiply the seconds by your frame rate to get a frame count, switch to Frames to timecode, and enter that number to read the timecode.

Enter values as HH:MM:SS:FF with colons between each pair, for example 00:02:15:08. Minutes and seconds must be 0 to 59, and single-digit fields are accepted so 0:1:5:0 also parses.

No. Every calculation runs locally in your browser with plain arithmetic, so the timecodes and frame counts you enter never leave your device.

Pair this with the video file size calculator to estimate storage from bitrate and duration, or the shutter angle calculator to match motion blur to your frame rate.