Miles to km Converter
Convert miles to kilometers for US driving, running, and international travel distance.
How It Works
Formula: mi to km = value × 1.609344
Example: 10 mi = 16.09344 km
Note: 1 mile equals 1.6093 kilometers, the US statute mile used for road distances and running events.
Common Uses
Quick Conversion Table
| mi | km |
|---|---|
| 1 | 1.6093 |
| 5 | 8.0467 |
| 10 | 16.0934 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 500 | 804.672 |
| 1000 | 1609 |
Rounding Rule
Rounded to 4 decimal places
Error Margin
±0.0001 km
Precision Guidance
For driving, round to 1 decimal place. For running events, keep 2 decimals.
Common Mistakes
Do not confuse the statute mile (1.609 km) with the nautical mile (1.852 km) used in aviation and sea travel.
Frequently Asked Questions
What is 1 mile in km?
1 mile equals 1.6093 kilometers using the international mile (1 mi = 1.609344 km).
How do I convert miles to km?
Multiply the mile value by 1.6093. For example, 10 mi × 1.6093 = 16.093 km.
How long is a marathon in km?
A marathon is 26.2 miles, which equals about 42.16 kilometers.
Is this the US statute mile?
Yes, this uses the US statute mile (5280 feet), the standard for US road distances.
Deep Dive Guide
Miles to KM: Complete Conversion Guide for US Travelers
Convert miles to km with the exact 1.609344 factor. Our guide covers road signs, running races, and international driving for US travelers.
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Exact Constants & Authoritative Sources
Every conversion on this page uses the fixed, internationally agreed constants below — drawn from NIST and the SI Brochure. No values are estimated or rounded as if exact. See the full list on our Sources & Standards page.
- EXACT1 inch (in) = 25.4 millimetres (exact)
- EXACT1 foot (ft) = 0.3048 metres (exact, 12 in)
- EXACT1 yard (yd) = 0.9144 metres (exact, 3 ft)
- EXACT1 mile (mi) = 1609.344 metres (exact, 5280 ft)
- EXACT1 centimetre (cm) = 0.01 metre (definition)
Common Pitfalls & How to Avoid Them
US survey foot is deprecated
The old US survey foot (0.304800609601 m) was retired in 2023 in favor of the international foot (0.3048 m). Modern conversions use the international foot; mixing them drifts over long distances.
Inches vs. centimetres for screens
Display and wheel sizes are often rounded to the nearest convenient number; a "27-inch" monitor is nominal, not a precise 68.58 cm panel.
A unit-conversion reference site has no manufacturer-specific or device calibration parameters, so "layered tuning" does not apply here. The only real error-handling is input validation: the converter rejects non-numeric, empty, or out-of-range entries and shows a clear message, then falls back to exact constants above. No estimated or rounded figures are ever presented as exact.
Authoritative sources for this page
- NIST (U.S. National Institute of Standards and Technology) — NIST SP 330 — The International System of Units (SI), 2019 edition
- BIPM (International Bureau of Weights and Measures) — SI Brochure — The International System of Units (9th edition)
Last Updated 2026 | This converter was reviewed for accuracy