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100 km/h = 62 mph

Speed Converter

100% Free

Convert km/h ↔ mph ↔ m/s ↔ knots ↔ ft/s — all 5 units update instantly as you type.

Real-time
Client-Side
5 units
Metre/sec (m/s)
m-s
Km/hour (km/h)
km-h
Miles/hour (mph)
mph
Knot (kn)
knot
Foot/sec (ft/s)
ft-s

Type into any unit to convert all the others. Click any row to make it the source.

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  title="Speed Converter">
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How to Use

  1. 1 Type a value into any of the 5 unit rows
  2. 2 All other units recalculate instantly
  3. 3 Click a different row to make it the source

Features

  • 5 units (m/s, km/h, mph, knot, ft/s)
  • Bidirectional table — type into any unit
  • International nautical mile = 1852 m exactly
  • Output to 8 significant digits
  • 100% client-side

Why it Matters

Driving abroad, watching a tennis serve, planning a sailing trip — speed conversions show up everywhere. A 5-unit table handles cars, sports, and aviation in one place. The knot conversion in particular is hard to find on Google's quick converter.

★★★★★

Use Cases

International Driving

Translate speed limits between km/h and mph

Sports Speed

Convert serve / pitch speeds between km/h and mph

Aviation / Sailing

Convert knots to km/h for flight or boat planning

Frequently Asked Questions

Why is 1 knot ≈ 1.852 km/h exactly?
A knot is one nautical mile per hour. The international nautical mile is defined as exactly 1852 metres (since 1929).
Is mph the same in US and UK?
Yes — both use the international mile = 1.609344 km exactly. Speed limits in the US are in mph; in the UK, road speed limits are also mph (despite metric for most other things).
How fast is mach 1?
Speed of sound at sea level ≈ 1234.8 km/h or 767.3 mph or 661.5 knots. (Varies with altitude and temperature.)
📖

Want to understand the conversions?

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How to Use Speed Converter
speed

How to Use Speed Converter — Complete Guide

Learn how to convert between km/h, mph, m/s, knots, and Mach number using the free Speed Converter on Tools.Town — all units at once, instant results.

7 May 2026

5 min read

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