Background

Speed conversion is essential when travelling internationally, or working in aviation/maritime. Metric uses km/h, US uses mph, aviation uses knots, science uses m/s.

Why Aviation Uses Knots

A knot = 1 nautical mile/hour. Nautical miles align with Earth's coordinates (1 NM = 1 minute of latitude). Airspeed and maritime speed are measured in knots worldwide.

Speed vs Velocity

Speed is magnitude only; velocity includes direction. For conversions, we deal with speed. 1 m/s = 3.6 km/h.

How to Use This Calculator

1. Select 'Speed'

   Choose Speed from the dropdown.

2. Select source unit

   Choose km/h, mph, knots, m/s, or ft/s.

3. Enter the value

   Type the speed.

4. Select target unit

   Choose the unit you need.

Applications

Driving Abroad

100 km/h = 62 mph. 70 mph = 113 km/h. Quick conversion keeps you legal.

Aviation and Sailing

A 450-knot cruising speed ≈ 833 km/h or 518 mph.

Sports and Fitness

Running/cycling speed in km/h or mph. Convert to compare internationally.

Frequently Asked Questions