Speed Converter
Quick Reference
• 1 km/h = 0.621371 mph
• 1 m/s = 3.6 km/h
• 1 mph = 1.60934 km/h
• 1 knot = 1.852 km/h
• Speed of sound (Mach 1) ≈ 343 m/s
• 100 km/h ≈ 62 mph
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About Speed Converter
Convert speed units instantly and free. Convert between miles per hour (mph), kilometers per hour (km/h), meters per second (m/s), feet per second, knots, and Mach. Accurate speed conversions for travel, sports, and science. No registration required - works 100% in your browser.
How to Use
Step 1
Enter the speed value
Step 2
Select the unit you're converting from
Step 3
Select the unit you're converting to
Step 4
Click 'Convert' to see the result
Step 5
Perfect for travel, sports, and science
Features & Benefits
- ✅Convert between 6 speed units
- ✅Metric: meters per second, kilometers per hour
- ✅Imperial: miles per hour, feet per second
- ✅Nautical: knot
- ✅Other: Mach (speed of sound)
- ✅High precision results
- ✅Quick reference table
- ✅100% browser-based
- ✅100% free
FAQs
How do I convert mph to km/h?
Multiply mph by 1.60934 to get km/h. For example, 60 mph × 1.60934 = 96.56 km/h. This is useful for international travel.
What is a knot?
1 knot = 1.852 km/h or 1.15078 mph. Knots are used in maritime and aviation for measuring speed.
What is Mach 1?
Mach 1 is the speed of sound, approximately 343 m/s or 1,235 km/h at sea level. Mach 2 is twice the speed of sound, and so on.