Speed Converter

Convert between speed units including km/h, mph, m/s, ft/s, and knots. Free online speed conversion calculator.

Last updated: June 1, 2026

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What is Speed Converter?

A speed converter translates between different velocity units — km/h, mph, m/s, knots, and feet per second. Different fields use different speed units: road speed in km/h (most countries) or mph (US/UK), aviation and maritime in knots, science in m/s, and engineering sometimes in ft/s. This tool handles all common conversions for anyone working across these domains — drivers comparing speed limits internationally, pilots converting between knots and km/h, or engineers working with wind speed data.

How It Works

Enter a speed value with its source unit and select the target unit. The tool converts through meters per second (m/s) as the base unit using precise factors: 1 km/h = 0.27778 m/s, 1 mph = 0.44704 m/s, 1 knot = 0.51444 m/s. All conversions update simultaneously so you can see the speed expressed in every supported unit at once. Results use appropriate precision — whole numbers for road speeds, decimals for scientific applications.

Quick Reference

km/h	mph	m/s	Knots
1	0.621	0.278	0.540
50	31.07	13.89	26.99
100	62.14	27.78	53.99
120	74.56	33.33	64.79
200	124.27	55.56	107.99

Common Use Cases

•Converting speed limits between km/h and mph when driving internationally or renting abroad
•Translating wind speed measurements between knots, km/h, and mph for weather data
•Converting running pace between min/km and min/mile for international fitness comparisons
•Translating aviation speeds between knots, km/h, and mach number for flight planning
•Converting scientific velocity measurements between m/s and other practical units
•Translating manufacturing line speeds between m/min and ft/min for equipment specifications