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Length unit converter

Convert between m, mm, cm, µm, km, in and more, with formulas and tables.

Popular length conversions

Conversion matrix

Each cell is how many of the column unit equal 1 of the row unit. Tap a value for the full table.

mmmcmµmkminftydmimilnmi
1 m11,0001001,000,0000.00139.37013.280841.093610.00062137139,370.10.000539957
1 mm0.00110.11,0001 × 10-60.03937010.003280840.001093616.21371 × 10-739.37015.39957 × 10-7
1 cm0.0110110,0001 × 10-50.3937010.03280840.01093616.21371 × 10-6393.7015.39957 × 10-6
1 µm1 × 10-60.0011 × 10-411 × 10-93.93701 × 10-53.28084 × 10-61.09361 × 10-66.21371 × 10-100.03937015.39957 × 10-10
1 km1,0001,000,000100,0001 × 109139,370.13,280.841,093.610.62137139,370,078.74015747760.539957
1 in0.025425.42.5425,4002.54 × 10-510.08333330.02777781.57828 × 10-51,0001.37149 × 10-5
1 ft0.3048304.830.48304,8000.00030481210.3333330.00018939412,0000.000164579
1 yd0.9144914.491.44914,4000.000914436310.00056818236,0000.000493737
1 mi1,609.341,609,344160,9341.60934 × 1091.6093463,3605,2801,760163,360,0000.868976
1 mil2.54 × 10-50.02540.0025425.42.54 × 10-80.0018.33333 × 10-52.77778 × 10-51.57828 × 10-811.37149 × 10-8
1 nmi1,8521,852,000185,2001.852 × 1091.85272,913.46,076.122,025.371.1507872,913,385.82677164671

The units

The international inch is exactly 25.4 mm. A mil (or thou) is a thousandth of an inch, used for coating, film and tolerance values; do not confuse it with the millimetre.

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