About Us

ConvertMM started as a laminated card taped inside a toolbox lid. For years it held the handful of conversions that came up again and again on the bench — the fractional-inch equivalents, the tap-drill sizes, the gauge thicknesses that nobody can ever remember correctly. The card got greasy, then illegible, then lost. This site is what replaced it: the same trusted numbers a maker actually reaches for, rebuilt so they're never smudged, never out of date, and always one tab away.

Our focus is narrow on purpose. We're not trying to convert currencies or cooking measures. We build for people who work in the seam between imperial and metric — woodworkers reading 32nds off a tape, machinists chasing a µm surface finish, fabricators weighing plate before they cut it, and DIYers staring at a mixed drawer of M6 and 1/4-20 bolts. Every tool exists because that exact question stopped somebody mid-project, and a five-second answer would have saved the re-cut.

The workshop notebook side of the site — vernier caliper technique, the truth about 2x4 dimensions, why cuts drift off by a millimetre — is written by an editor who spent a decade between a cabinet shop and a small machine shop before deciding the internet needed fewer clone converters and more honest reference tables. The editor checks the fastener and gauge data against published standards rather than copying whatever the last website said, because "close enough" is precisely how a drawer of parts stops fitting together.

We keep it free, keep it fast, and keep it free of the pop-ups and sign-up walls that make a quick lookup miserable when your hands are full. If you spot a number that looks off, a standard we've missed, or a conversion you keep wishing existed, tell us — corrections from people who actually use these tools at the bench are the best thing that lands in our inbox. Reach the editorial team any time at [email protected], and we read every message.