FormatCalc library
Publishing & media
without the noise.
Plan image crops, print dimensions, storage, bitrate, timecode, book production, reading time, and accessibility constraints. Platform overlays and printer specifications vary, so use the result as a preflight check and confirm final vendor requirements. Choose a tool below to get started—no account required.
Pixels, DPI/PPI & Print Size Calculator
Convert between pixel dimensions and physical print size at a chosen image resolution.
Image Aspect Ratio Calculator
Simplify an image ratio and scale one dimension without stretching the image.
Social Media Crop & Safe-Area Preview
Preview a centered social-media crop and overlay your own editable safe-area insets.
Video Bitrate, Duration & File Size Calculator
Solve for video file size, video bitrate, or duration using decimal media-storage units.
Recording Time vs. Storage Calculator
Estimate multi-camera recording retention and daily storage from bitrate and usable capacity.
Audio File Size Calculator
Estimate uncompressed PCM or compressed audio size from duration and encoding settings.
Book Spine Width Calculator
Estimate a paperback spine from page count using printer-supplied pages-per-inch or paper caliper.
Full Book Cover Spread Calculator
Calculate a back-cover, spine, front-cover, bleed, and optional flap canvas.
Word Count to Pages Estimator
Estimate manuscript and finished page counts with editable words-per-page and front/back matter.
Reading & Speaking Time Calculator
Estimate silent reading and spoken delivery time from word count and editable speeds.
Audiobook Duration Estimator
Estimate finished audiobook length with narration speed, retakes, credits, and intro/outro time.
Bleed, Trim & Margin Calculator
Calculate document canvas, trim guides, and the usable safe-content area for a printed page.
Paper Size Converter & Visual Comparison
Convert a paper format to millimeters, inches, points, and pixels while comparing its physical size.
Frame Rate & Timecode Converter
Convert frame counts and SMPTE timecode, including 29.97 and 59.94 drop-frame numbering.
Subtitle Reading Speed Checker
Check subtitle characters per second and words per minute against editable limits.
ISBN-10 & ISBN-13 Validator / Check-Digit Calculator
Validate ISBN-10 and ISBN-13 numbers or calculate a missing check digit from 9 or 12 digits.