How nany mm in an inch | 1 inch in mm RapidTables Home›Conversion›Length conversion› 1 inch in mm How many Millimeters are in an Inch 1 inch (″) in millimeters (mm). How many millimeters are in an inch 1 inch is equal to 25.4 millimeters: 1 ″ = 25.4 mm Inches to mm conversion ► See also Inches to mm conversion Write how to improve this page Submit Feedback LENGTH CONVERSION cm to feet cm to inches cm to mm Feet to cm Feet to mm Feet to inches Feet to meters Inches to cm Inches to feet Inches to meters Inches to mm km to miles Meters to feet Meters to inches Miles to km mm to cm mm to feet mm to inches RAPID TABLES Recommend Site Send Feedback About This website uses cookies to improve your experience, analyze traffic and display ads. Learn more OK Manage Settings