Miles to Kilometers Converter

The conversion factor

A mile is defined as exactly 1,609.344 meters, so one mile equals 1.60934 kilometers (rounded to five decimal places). The formula: kilometers = miles × 1.60934.

Worked example: a marathon

A marathon is 26.2 miles. Enter that value and the tool returns 42.16 km (26.2 × 1.60934 = 42.1647, rounded to two decimals) — close to the official marathon distance of 42.195 km; the small gap is because 26.2 miles itself is a rounded figure (the exact distance is 26.2188 miles).

Reference distances

The input field converts on every keystroke (via the oninput event), so there's no separate convert button to click — the kilometers figure updates live as you type.