Tools
Free utilities for broadcast & post.
Quick, accurate tools for the everyday maths of delivery. The calculators are free with no sign-up. Built by the team behind SpectraQC, the self-serve QC engine for broadcast and streaming deliverables.
Timecode calculator
Add, subtract and convert SMPTE timecode across frames and real time: 23.976 to 60 fps, drop-frame and non-drop.
Open →Video file size calculator
Estimate master/mezzanine size from duration, codec, resolution and frame rate: ProRes, DNxHD, AVC-Intra, XDCAM, uncompressed.
Open →Safe areas & aspect ratio
EBU R95 action/graphics safe and DPP/BBC caption cages at any resolution. Downloadable transparent PNG overlay, plus letterbox/pillarbox maths.
Open →Audio track layouts
EBU R123 / R48 track allocations as visual channel maps, the 5.1 broadcast-vs-film order trap, Dolby E placement, and broadcaster examples.
Open →Loudness targets & gain
EBU R128, ATSC A/85 and real broadcaster deliveries (target, tolerance and true-peak ceiling in one table), plus a gain-to-target calculator.
Open →Frame rate & runtime
Runtime conversion between rates: PAL speed-up (exactly 25/24), 2:3 pulldown frame counts, and which conversions change runtime and pitch.
Open →Subtitle reading speed
Characters-per-second and WPM against Netflix / EBU limits (one cue or a whole SRT, WebVTT, TTML, EBU-STL or SCC file), counted exactly as SpectraQC’s QC does.
Open →