Drop-Frame Timecode Calculator
Add and subtract SMPTE timecodes with correct drop-frame handling for 29.97 and 59.94 fps, and convert between timecode and frame counts.
Overview
A precise SMPTE timecode calculator that implements true drop-frame conversion. Enter a starting timecode (tc1) or a frame count, an operation (add/sub), a second timecode (tc2), the frame rate and an optional drop=auto/true/false flag. It converts to a total frame count and back, performs the arithmetic, and returns the resulting timecode using the correct separator. Built for editors, colorists and broadcast engineers who need frame-accurate math.