Home › Unit Conversion › Miles per hour to Kilometers per hour
Miles per hour to Kilometers per hour (mph to km/h)
Convert miles per hour to kilometers per hour: 1 mph = 1.60934 km/h. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 mph = 1.60934 km/h
kilometers per hour = miles per hour × 1.609344 — reverse: miles per hour = kilometers per hour × 0.6213711922
The factor is derived from the SI definitions of both units (base unit: m/s) 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 mph = 8.04672 km/h
- 12.5 mph = 20.1168 km/h
- 100 mph = 160.934 km/h
Miles per hour to kilometers per hour conversion table
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 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 per hour are in one mile per hour?
1 mph = 1.60934 km/h. 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 per hour to kilometers per hour?
Multiply the value in miles per hour by 1.609344: kilometers per hour = miles per hour × 1.609344. For example, 5 mph = 8.04672 km/h.
How do I convert kilometers per hour back to miles per hour?
Multiply by the inverse factor 0.6213711922 (miles per hour = kilometers per hour × 0.6213711922), or use the kilometers per hour-to-miles per hour page.
Related conversions
- Kilometers per hour to miles per hour (reverse)
- Speed Converter — all speed units in one tool
- Meters per second to Kilometers per hour
- Kilometers per hour to Meters per second
- Meters per second to Miles per hour
- Miles per hour to Meters per second
- Knots to Kilometers per hour
- Kilometers per hour to Knots
- Knots to Miles per hour
- Miles per hour to Knots
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=mph&to_unit=km%2Fh - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"mph","to_unit":"km/h"} - Markdown: https://tttkmbb.com/conversion/mph-to-kmh.md · JSON: https://tttkmbb.com/conversion/mph-to-kmh.json (add
?value=for a result) · Units: /api/v1/units?quantity=speed - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.