About
About FramingMath
FramingMath is a small set of fast, free calculators for picture framing and matting — built because the existing options were either fiddly hand-math or clunky spreadsheets you had to download.
Why this exists
It started with one mat. Working out the border so a print sits centered — then accounting for the quarter-inch overlap, the slightly larger bottom border, and the frame size that all of it adds up to — meant a notepad, a calculator, and a couple of mistakes with expensive board.
The tools online weren't much better: downloadable Excel files, single-purpose pages that only did one size, or calculators that gave a number with no picture of what it meant. So I built the thing I wanted — something that does the framing math instantly, shows you the result, and works on a phone at the framing table.
What FramingMath does
The goal is a toolset that's:
- Accurate — formulas tested against known correct values, to the 1/16 inch or the millimeter.
- Instant — results as you type; nothing to install or download.
- No sign-up — no account, no email wall, no paywall.
- Shareable — every result has its own link that reopens the exact layout.
- Bilingual on units — US sizing throughout with full metric support, side by side.
What makes it different
Most framing calculators stop at a number. FramingMath adds the parts that actually help you commit to a cut:
- a live SVG preview of the finished piece, redrawn as you change the numbers;
- shareable, deep-link URLs — answer a question or save a layout by sending a link that opens it pre-filled;
- no spreadsheet downloads — it's a web page, not a file to manage;
- a mobile-friendly layout for use right at the workbench.
Who's behind it
FramingMath is built and maintained by nanadiahub. There's no company behind the site, no affiliation with any framing retailer or supplier, and nothing to sign up for. If you spot an error in a calculation, I genuinely want to hear about it — see below.
Start here
Try the flagship multi-opening mat calculator for collage and multi-photo layouts, or read the framing & matting guides to brush up on borders, bottom-weighting and double mats. Found a bug or have a feature idea? Email support@framingmath.com.