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Miles to Kilometers (mi to km)
Convert miles to kilometers: 1 mi = 1.60934 km. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 mi = 1.60934 km
kilometers = miles × 1.609344 — reverse: miles = kilometers × 0.6213711922
The factor is derived from the SI definitions of both units (base unit: m) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 mi = 8.04672 km
- 12.5 mi = 20.1168 km
- 100 mi = 160.934 km
Miles to kilometers conversion table
| Miles (mi) | Kilometers (km) |
|---|---|
| 1 | 1.60934 |
| 2 | 3.21869 |
| 3 | 4.82803 |
| 4 | 6.43738 |
| 5 | 8.04672 |
| 6 | 9.65606 |
| 7 | 11.2654 |
| 8 | 12.8748 |
| 9 | 14.4841 |
| 10 | 16.0934 |
| 15 | 24.1402 |
| 20 | 32.1869 |
| 25 | 40.2336 |
| 30 | 48.2803 |
| 40 | 64.3738 |
| 50 | 80.4672 |
| 75 | 120.701 |
| 100 | 160.934 |
| 200 | 321.869 |
| 250 | 402.336 |
| 500 | 804.672 |
| 1000 | 1609.34 |
FAQ
How many kilometers are in one mile?
1 mi = 1.60934 km. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert miles to kilometers?
Multiply the value in miles by 1.609344: kilometers = miles × 1.609344. For example, 5 mi = 8.04672 km.
How do I convert kilometers back to miles?
Multiply by the inverse factor 0.6213711922 (miles = kilometers × 0.6213711922), or use the kilometers-to-miles page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=mi&to_unit=km - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"mi","to_unit":"km"} - Markdown: https://tttkmbb.com/conversion/miles-to-km.md · JSON: https://tttkmbb.com/conversion/miles-to-km.json (add
?value=for a result) · Units: /api/v1/units?quantity=length - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.