Speed Converter

Convert speeds between km/h, mph, m/s, knots and more.

Speed Input

Value Unit Decimal places

Results

Enter a speed to compare road, metric, aviation, marine, scientific, and mechanical units.

Pace per mile: -

Pace per km: -

mph km/h m/s ft/s kn in/s km/s Mach c

Reference

Driving 60 mph is about 96.56 km/h; 100 km/h is about 62.14 mph

Running pace Pace is time per mile or kilometer, so faster speeds produce smaller times

Air and sea 1 knot = 1 nautical mile per hour; Mach 1 here uses 340.29 m/s

Tool Introduction

Use this speed converter for road speeds, running and cycling pace, aviation, marine navigation, physics, and engineering work. It converts between mph, km/h, m/s, ft/s, knots, inches per second, km/s, Mach, and the speed of light.

U.S. road speeds are usually shown in mph, most international traffic and fitness data use km/h or pace per kilometer, and aircraft or boat speeds often use knots. This page keeps those everyday readings visible next to the scientific units.