MilesToKM — Free Online Miles to Kilometers Converter
100% free, instant & accurate miles to km distance converter. 1 mile = 1.609344 km.
Quick Answer: How Many Kilometers in a Mile?
Why Use MilesToKM?
Instant Two-Way Conversion
Type in either box — miles to km and km to miles update on every keystroke.
One-Click Unit Swap
Flip the direction between miles and kilometers instantly with the swap button.
Precision Control
Round results to 0–5 decimal places for running splits, travel or engineering.
Copy Result
Copy the converted value to your clipboard with a single tap.
1–100 Lookup Table
Searchable miles to km and km to miles reference chart.
Private & Offline-Ready
100% client-side. Nothing is uploaded, no sign-up, no tracking of your values.
Miles to Kilometers Formula, Step by Step
The international mile is defined as exactly 1,609.344 meters, so one mile is exactly 1.609344 kilometers.
Miles → Kilometers
- Take your distance in miles, e.g. 26.2 mi.
- Multiply by the conversion factor 1.609344.
- 26.2 × 1.609344 = 42.164813 km.
- Round to the precision you need: 42.16 km.
Kilometers → Miles
- Take your distance in kilometers, e.g. 10 km.
- Divide by 1.609344 (or multiply by 0.621371).
- 10 ÷ 1.609344 = 6.213712 mi.
- Round as needed: 6.21 miles.
Live Worked Example
Mental shortcut: multiply miles by 1.6 (≈0.6% low), or use Fibonacci numbers — 3 mi ≈ 5 km, 5 mi ≈ 8 km, 8 mi ≈ 13 km.
Miles to KM Conversion Table (1–100) Lookup
Quick reference chart for common distances. Values follow the decimals selector above.
| Miles | Kilometers | Kilometers | Miles |
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Frequently Asked Questions
How many kilometers are in a mile?
There are exactly 1.609344 kilometers in one mile. This value is defined by the international yard and pound agreement of 1959.
What is the formula to convert miles to km?
Multiply the number of miles by 1.609344. Kilometers = Miles × 1.609344. For example, 10 miles × 1.609344 = 16.09344 km.
How do I convert km to miles?
Divide kilometers by 1.609344, or multiply by 0.621371. Miles = Kilometers ÷ 1.609344. For example, 5 km ÷ 1.609344 ≈ 3.10686 miles.
How many km is a marathon in miles?
A marathon is 26.2188 miles, which equals 42.195 kilometers. A half marathon is 13.1094 miles (21.0975 km).
Is there a quick way to estimate miles to km in my head?
Multiply miles by 1.6 for a close estimate, or use the Fibonacci trick: consecutive Fibonacci numbers approximate miles to km (3 mi ≈ 5 km, 5 mi ≈ 8 km, 8 mi ≈ 13 km).
How do I use the MilesToKM converter?
Type a distance into the Miles box and the Kilometers box updates instantly. Type into the Kilometers box to convert the other way, press the ↔ button to swap units, pick 0–5 decimals, and tap Copy result.
Is MilesToKM free and private?
Yes. MilesToKM is 100% free, requires no sign-up, and runs 100% client-side in your browser, so it is secure — no values are sent to any server.