Converters

Speed Converter

Convert speed units instantly. Supports MPH, KPH, Meters per second, Mac, and Knots.

Use Speed Converter to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.

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About this tool

Different countries and industries use different units for speed. Cars in the US use MPH, while most of the world uses KPH. Boats and planes use Knots. Science uses Meters per Second.

This tool creates a unified way to translate velocity.

Usage examples

Highway Speed

60 MPH

60 MPH = 96.56 KPH

Sound Barrier

Mach 1

1 Mach = 767 MPH

How to use

  1. Enter the speed value.
  2. Select the unit "From" and "To".
  3. See the converted speed instantly.

Benefits

  • Precision decimals
  • Supports 5 common units
  • Bidirectional

FAQs

What is a Knot?

One knot is one nautical mile per hour (approximately 1.15 mph or 1.85 km/h). It is used globally for maritime and aviation navigation. The term comes from historical ship speed measurement using a knotted rope. Knots remain the standard for boats, ships, and aircraft because nautical miles correspond to latitude degrees.

How fast is Mach 1?

Mach 1 is the speed of sound, approximately 767 mph (1,235 km/h) at sea level and 20°C. The actual speed varies with temperature and altitude - sound travels faster in warmer air and slower at high altitudes. At cruising altitude (35,000 ft), Mach 1 is about 660 mph due to colder temperatures.

What speed unit should I use for running?

For running, minutes per kilometer (min/km) or minutes per mile (min/mi) are most common. For conversions, use meters per second (m/s) or kilometers per hour (km/h). A 10 km/h pace is about 6 mph or 2.78 m/s, which equals 6:00 per kilometer or 10:00 per mile - a good recreational running pace.

How do I convert MPH to KPH?

Multiply MPH by 1.60934 to get KPH. For example, 60 mph × 1.60934 = 96.56 km/h. Quick mental math: multiply by 1.6. Going the other way, divide KPH by 1.60934, or multiply by 0.621371. This conversion is essential when driving between the US (MPH) and most other countries (KPH).

What is the difference between speed and velocity?

Speed is how fast you're moving (scalar quantity). Velocity is speed in a specific direction (vector quantity). For example, "50 mph" is speed, "50 mph north" is velocity. In everyday use and conversions, the terms are interchangeable. In physics, velocity accounts for direction changes while speed doesn't.

Why do different countries use different speed units?

Most of the world uses the metric system (km/h) adopted internationally for consistency. The US, UK (partially), and a few other countries use MPH due to historical imperial system usage. Aviation and maritime use knots for navigation consistency. Science uses m/s for precision. This tool bridges these differences for easy conversion.

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