Unit Conversion
Millimeters to Inches Converter
Convert millimeters to inches instantly with engineering precision.
Inputs
Result
Result
3.937in
Formula
inches = millimeters ÷ 25.4
Share result
Advertisement
Formula
inches = millimeters ÷ 25.4
Worked example
100 mm ÷ 25.4 = 3.9370 in
FAQ
+How many mm in an inch?
Exactly 25.4 millimeters equal one inch.
+Is the conversion exact?
Yes — by international agreement 1 inch = 25.4 mm exactly.
Related calculators
Inch to mm Converter
Convert inches to millimeters with workshop-grade precision.
Bar to PSI Converter
Convert bar to pounds per square inch (psi).
PSI to Bar Converter
Convert psi to bar for pneumatic and hydraulic systems.
kg to lbs Converter
Convert kilograms to pounds for shipping, load and design work.