Free Video Calculators Tools
Free calculators for video editors and producers — bitrate, file size and timecode math.
2:3 Pulldown Cadence Diagram
Scrub field by field through 2:3 pulldown to see how 4 film frames at 23.976 fps become 5 interlaced video frames at 29.97 fps — the two dirty frames highlighted, TFF/BFF explained.
Use ToolAspect Ratio Calculator
Solve width or height from a ratio, simplify any resolution to its aspect ratio, and preview crop vs letterbox between ratios.
Use ToolDF vs NDF Drift Chart
See exactly how far non-drop timecode drifts from the wall clock as a program runs — an SVG chart with drift markers at 30 s, 22 min, 44 min, 90 min and 2 hours, a movable custom-length marker, and the drop-frame comparison line, free in your browser.
Use ToolFile Transfer Time Calculator
Turn a file size or production preset into a realistic transfer time — sustained (not advertised) connection speeds, dual MB/s and Mbit/s readouts, milestone ETAs, and a live ship-a-drive crossover — free, in your browser.
Use ToolMemory Card Record-Time Grid
See how long a memory card really records at each codec's nominal bitrate — a capacity × codec heatmap with the full byte-to-bitrate math one click away.
Use ToolMulticam Sync Offset Calculator
Enter what each camera's timecode read at a shared clap or flash and get the exact signed offset between them, plus a converter for any timecode in between — drop-frame handled correctly.
Use ToolOffload & Checksum Time Calculator
Estimate how long it really takes to copy a card, verify the checksum and make a second backup. Enter your footage size and source/destination interfaces to see a Gantt chart with the governing bottleneck named on every bar.
Use ToolTimecode Calculator
Add and subtract SMPTE timecodes, convert timecode to frames or real duration, and switch between 23.976, 24, 25, 29.97 drop-frame and 60 fps — free, right in your browser.
Use ToolTimecode Frame-Rate Converter
Convert a timecode between frame rates two ways: the same real-world moment, or a conform that relabels the same frame number — with drop-frame handled correctly.
Use ToolTimecode ↔ Wall-Clock Calculator
Convert time-of-day timecode to the real wall-clock moment it represents, or the reverse — at 23.976, 24, 25, 29.97 drop-frame/non-drop-frame and 30 fps, with NDF drift computed via the exact 1.001 ratio, free in your browser.
Use ToolVideo Bitrate Calculator
Pick resolution, frame rate and codec to get the recommended encoding bitrate — plus an estimated file size for any duration.
Use ToolVideo File Size Calculator
Estimate video file size from a codec preset — ProRes, DNxHR, XAVC or H.264 at your resolution and frame rate — or from any bitrate, or backwards from a target size.
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