Kilometers ↔ Miles Converter
Convert between kilometers and miles instantly
📚 Kilometers ↔ Miles Conversion Details
Kilometers to Miles Formula
To convert kilometers to miles, multiply kilometers by 0.621371.
Miles to Kilometers Formula
To convert miles to kilometers, multiply miles by 1.60934.
Bidirectional Conversion
This converter works both ways simultaneously:
- Type in kilometers → miles updates automatically
- Type in miles → kilometers updates automatically
- No buttons to click - works as you type
Common Uses
- Road distance calculation
- Running and marathon distances
- Travel planning
- Vehicle fuel efficiency
📏 How This Converter Works
This is a bidirectional converter that works in real-time:
- Kilometers → Miles: When you type in the kilometers field, the miles field automatically updates
- Miles → Kilometers: When you type in the miles field, the kilometers field automatically updates
- No swapping needed: Both conversions happen simultaneously
- Real-time: Updates happen as you type, no button clicks required
miles = kilometers × 0.621371
kilometers = miles × 1.60934
// Example 1: Type "10" in kilometers
miles = 10 × 0.621371 = 6.21371
// Example 2: Type "5" in miles
kilometers = 5 × 1.60934 = 8.0467
📊 Conversion Table
| Kilometers | Miles | Common Usage |
|---|---|---|
| 1 km | 0.621 mi | Short walk |
| 5 km | 3.107 mi | 5K race |
| 10 km | 6.214 mi | 10K race |
| 21.1 km | 13.109 mi | Half marathon |
| 42.2 km | 26.219 mi | Marathon |
| 100 km | 62.137 mi | Ultra marathon |
❓ Frequently Asked Questions
A: There are approximately 1.60934 kilometers in one mile.
A: Both input fields work simultaneously. When you change the kilometers value, miles updates automatically. When you change the miles value, kilometers updates automatically. No swap button needed.
A: No! The conversion happens automatically as you type in either field.
A: This converter provides accurate calculations up to 6 decimal places using the standard conversion factor.
A: This converter uses statute miles (land miles). 1 statute mile = 1.60934 km. Nautical miles are longer: 1 nautical mile = 1.852 km.