Precision and rounding
Keep extra digits when dimensions must fit a specification. Rounding too early can accumulate error across repeated pieces, routes, or construction measurements.
Conversion library
Length converters
Convert metric, imperial, US customary, and nautical measurements for everyday dimensions, travel distances, construction, and technical work.
12 units132 directional pairsExact formulas
Essential context
Understanding length conversions
Length units describe one-dimensional distance or size. Metric units scale by powers of ten, while inches, feet, yards, and miles follow exact international definitions linked to the meter.
A distinction that matters
A nautical mile is not a statute mile: it is exactly 1,852 meters and is intended for marine and aviation navigation.
Complete directory
Browse by starting unit
Choose the unit you have, then select the unit you need. Every destination opens a dedicated static page with an interactive converter, formula, worked example, and reference table.
From Nanometer
nmFrom Micrometer
μmFrom Millimeter
mmFrom Centimeter
cmFrom Decimeter
dmFrom Meter
mFrom Kilometer
kmFrom Inch
inFrom Foot
ftFrom Yard
ydFrom Mile
miFrom Nautical mile
nmiEnjoy Convr? Follow us on Google
Add convr.tools as a Preferred Source so our converters and guides show up first in Google Search, Top Stories, AI Overviews and Discover.
Add as a preferred source on Google