At One Place

Inches to kilometers

1 inch in kilometers
1 in = 0.0000254 km
km = in × 0.0000254

To convert inches to kilometers, multiply by 0.0000254. The table below gives the values people look up most often, and the converter works for any number.

Inches to kilometers table

Common inch values converted to kilometers.
Inches Kilometers
1 in 0.0000254
2 in 0.0000508
3 in 0.0000762
4 in 0.0001016
5 in 0.000127
10 in 0.000254
15 in 0.000381
20 in 0.000508
25 in 0.000635
30 in 0.000762
40 in 0.001016
50 in 0.00127
75 in 0.001905
100 in 0.00254
250 in 0.00635
500 in 0.0127
1,000 in 0.0254

How the conversion works

The relationship is km = in × 0.0000254. Both units measure length, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two.

Common questions

How many kilometers are in one inch?
One inch equals 0.0000254 kilometers. km = in × 0.0000254.
How do you convert inches to kilometers?
Use km = in × 0.0000254. So 10 in is 0.000254 km.
How many inches are in one kilometer?
One kilometer equals 39,370.079 inches, which is the reverse of the conversion above.

Related pages

Sources

  1. Guide for the Use of the International System of Units (SP 811) — NIST (Public domain (US Government))
  2. The International System of Units (SI Brochure) — Bureau International des Poids et Mesures
  3. Calculated on this page — At One Place

How these figures are compiled and checked