Length Converter

Same multi-unit tool as the homepage: mm, cm, m, km, inches, feet, yards, and miles. Defaults to millimeters → inches.

Millimeters (mm)

Inches (in)

25 mm ÷ 25.4 = 0.98425197 in

Featured converters

Primary hub mm to inches
Primary hub: formula, bidirectional converter, 0–100 mm chart with nearest 1/64, and “how far off” specification checks.
Fractions mm to inches fraction
mm to fractional inches: nearest 1/64, 1/32 and 1/16, with a printable chart and a mm to frac calculator.
Shop sizes Drill bits & sockets
Scene decision table — common metric bit/socket sizes with decimal inches, nearest 1/64, and error in millimeters.
Hub cm to inches
Full hub: formula, bidirectional converter, 0–100 cm chart with nearest 1/64, height in feet + inches, and everyday ISO sizes.
Hub meters to feet
Full hub: formula, decimal feet, feet + inches, 0–10 / 10–100 / 100–1000 m charts, height rounding, and construction/track context.
Hub inch to mm
Reverse of mm to inches: 1 in = 25.4 mm exactly, fraction chart, and dedicated 1/4, 3/8, 1/2, 5/8, 3/4, 5/16, 1 1/4, 1.5, 1 1/2, 1 5/8 and 2 1/2 inch pages.

Common conversion directions. Dedicated hubs open their own pages; other pairs use the converter on this page.

mm to inches Hub
Full hub with fraction inches, chart, and PAA-style “is it equal?” answers.
mm to inches fraction Hub
Fractional inches chart (1/64, 1/32, 1/16) and mm to frac calculator.
cm to inches Hub
Full hub with decimal, nearest 1/64, feet + inches, charts, height context, and published cm values.
inches to cm Via converter
Use the length converter on this page (in → cm).
cm to feet Via converter
Pick cm and ft in the converter on this page.
meters to feet Hub
Full hub with decimal feet, feet + inches, height rounding, and m → ft charts.
km to miles Via converter
Use the converter on this page (km ↔ mi).
inch to mm Hub
Hub for inch to mm, inches to mm, and inches to millimeters, plus fraction value pages.
feet to inches Via converter
Use the converter on this page (ft ↔ in).

All published millimeter value pages. Full formula and charts live on mm to inches.

All published centimeter value pages. Full formula and charts live on cm to inches.

All published meter value pages. Full formula and charts live on meters to feet.

Fractional-inch sizes with dedicated pages. Full formula and charts live on inch to mm.

Published centimeter height conversions. The general length converter handles other cm → feet inputs.