Why We Built ScaleAndFit
Most measurement tools online bury simple answers behind pop-ups, slow file uploads, or vague approximations. ScaleAndFit brings four everyday physical calibration tools into one fast, clear workspace designed so anyone can get a reliable answer in seconds.
Every pixel, millimeter, and PDF page point is calculated mathematically inside your browser — from international banking card width (85.60 mm) to official 300-DPI passport ovals.
International Standards Used
- Passport & Visa Photos (ICAO Doc 9303): Calculates 300 pixels per inch (11.811 px/mm) output canvases and target crown-to-chin ratios across 36 country rules.
- Printable Vector PDFs (72 PostScript pt/in): Writes true geometric coordinates into clean PDF vectors using ISO A4 (210 × 297 mm) and US Letter (215.9 × 279.4 mm).
- Shoe Sizing (ISO 9407 Mondopoint): Translates US, UK, and Paris-Point EU sizes through canonical foot length in millimeters plus brand last offsets.
- Ring Sizing (ISO 8653 & ISO/IEC 7810 ID-1): Uses a real 85.60 × 53.98 mm card reference to eliminate display DPI distortion on phones, laptops, and monitors.