How to Use the Speed Converter

Enter the speed value you want to convert

Select the unit you are converting FROM

Click Convert Speed to see all units at once

Use Quick References for common speeds like highway limits or Mach 1

About This Speed Converter

Our speed converter supports all major velocity units — km/h (used in India and most of the world for road speeds), mph (used in the US and UK), m/s (used in physics and science), knots (used in aviation and maritime), Mach (ratio to speed of sound), and ft/s.

India's national speed limits are expressed in km/h — 50 km/h in cities, 100 km/h on state highways, and 120 km/h on expressways. Use this converter when reading international car specs, aviation data, or weather reports that use different speed units.

Frequently Asked Questions

1 mph = 1.60934 km/h. To convert mph to km/h, multiply by 1.60934. For example, 60 mph = 60 × 1.60934 = 96.56 km/h.

Mach 1 (speed of sound at sea level, 15°C) = 343 m/s = 1,235 km/h = 767 mph. The speed of sound varies with temperature and altitude.

1 knot = 1.852 km/h = 1.151 mph. Knots are used in aviation and maritime navigation. A knot is one nautical mile per hour.

100 km/h = 62.137 mph. This is a common highway speed limit in many countries. It equals approximately 27.78 m/s or 53.996 knots.