What is the conversion?

1 km = 1000 m and 1 m = 1000 mm, so 1 km = 1000000 mm.

1 km = 1000000 mm. 0.001 km = 1000 mm.

Online KM to MM Converter

Convert kilometers to millimeters. 1 km = 1000 m, 1 m = 1000 mm. Client-side only.

Kilometers

What is the conversion?: 1 km = 1000 m and 1 m = 1000 mm, so 1 km = 1000000 mm.
Example?: 1 km = 1000000 mm. 0.001 km = 1000 mm.

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Free temperature converter.

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Calculate tip and split the bill. Enter bill amount, tip percentage, and number of people.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.

Combinations Calculator

Calculate C(n,r) — the number of ways to choose r items from n without order. Uses n!/(r!(n-r)!).

Combinations with Replacement Calculator

Calculate the number of ways to choose r items from n with repetition allowed. Formula: C(n+r-1, r).

Even Permutations Calculator

Count how many permutations of n objects are even (expressible as an even number of swaps). For n ≥ 2, equals n!/2.