Length and size converters
Convert between metric and imperial lengths: centimeters, inches, feet, meters, millimeters, kilometers and miles. Instant results for shopping, travel, construction and everyday measurements.
Last updated: May 2026
Metric and imperial
Most length conversions come down to one job: a spec sheet, product listing or map distance is in the wrong unit system. These are the most-used converters.
cm to inches
Screens, furniture, clothing sizes and product dimensions.
Inches to cm
US product specs and sizing converted to metric.
km to miles
Road distances, running routes and map scales.
Meters to feet
Room heights, property listings and height descriptions.
Feet to meters
US measurements converted to metric for plans and specs.
Smaller units
Millimeters and fractional inches come up in manufacturing, 3D printing, machining and detailed product specs.
When you need a length converter
Length is the most common source of metric versus imperial confusion. A screen listed in inches, a piece of furniture in centimeters, a road sign in miles, a product spec in millimeters â each one forces a conversion the moment you try to compare or order.
The most practical rule: pick one unit system and convert everything else into it before you start. Mixing halfway through a project is where mistakes happen.