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Speed Converter | KM/H, MPH, M/S, Knots | Free Online Tool

Free speed velocity converter. Convert km/h, mph, m/s, knots, and more. Perfect for driving, aviation, running, cycling. Instant accurate conversions with formulas.

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7+ Units
All Speeds
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Includes Knots
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Speed Converter

Convert between all speed units

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To

Quick Reference:

Highway speed: 100 km/h ≈ 62 mph
Speed of sound: ≈ 343 m/s (Mach 1)
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Speed Conversion Facts

Understanding speed measurements

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7+
Unit Types

All speed units

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Instant
Real-time

As you type

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Precise
Accurate

10 decimal places

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Universal
Land, Sea & Air

All contexts

💡 Pro Tip: Speed conversions are crucial for driving, aviation, maritime navigation, and scientific calculations.

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How to Use This Converter

Step-by-step guide to get started

How to Convert Speed Units

  1. Select Source Unit: Choose starting unit (km/h, mph, m/s, etc.)
  2. Enter Speed: Type the speed value
  3. Select Target Unit: Choose desired unit
  4. View Results: Get instant conversion with formula
  5. See Multiple: View equivalent speeds in all common units

Supported Speed Units

  • Common: Kilometers per hour (km/h), Miles per hour (mph), Meters per second (m/s)
  • Maritime/Aviation: Knots (kn), Mach number
  • Imperial: Feet per second (ft/s), Feet per minute
  • Other: Centimeters per second, Speed of light (c)

Quick Reference

  • 100 km/h = 62.14 mph = 27.78 m/s = 54.00 knots
  • 60 mph = 96.56 km/h = 26.82 m/s = 52.14 knots
  • 10 m/s = 36 km/h = 22.37 mph = 19.44 knots
  • 1 knot = 1.852 km/h = 1.151 mph = 0.514 m/s

Quick Tip: Follow these steps in order for the best experience

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How It Works

Understanding speed conversion formulas

Speed Conversion Formulas

Speed is distance divided by time. Converting speed requires understanding the relationship between distance units and time units in each system.

Key Formulas

KM/H to MPH

Formula: mph = km/h × 0.621371

Example: 100 km/h = 100 × 0.621371 = 62.1371 mph

MPH to KM/H

Formula: km/h = mph × 1.60934

Example: 65 mph = 65 × 1.60934 = 104.607 km/h

KM/H to M/S

Formula: m/s = km/h ÷ 3.6

Example: 90 km/h = 90 ÷ 3.6 = 25 m/s

MPH to M/S

Formula: m/s = mph × 0.44704

Example: 60 mph = 60 × 0.44704 = 26.8224 m/s

Knots to KM/H

Formula: km/h = knots × 1.852

Example: 100 knots = 100 × 1.852 = 185.2 km/h

Understanding Speed Units

Kilometers per hour (km/h): Metric standard. Used worldwide for road speeds. Most countries use km/h for speed limits.

Miles per hour (mph): Imperial unit. Used in USA, UK, and few other countries for road speeds.

Meters per second (m/s): SI unit of velocity. Used in physics, athletics, science. 1 m/s = walking speed.

Knots: Nautical miles per hour. Used in maritime and aviation. 1 knot = 1 nautical mile per hour = 1.852 km/h.

Speed Comparisons

  • Walking: 5 km/h = 3.1 mph = 1.4 m/s
  • Running: 12 km/h = 7.5 mph = 3.3 m/s
  • Cycling: 25 km/h = 15.5 mph = 6.9 m/s
  • City driving: 50 km/h = 31 mph = 13.9 m/s
  • Highway: 120 km/h = 75 mph = 33.3 m/s
  • High-speed rail: 300 km/h = 186 mph = 83.3 m/s
  • Airplane cruise: 900 km/h = 559 mph = 250 m/s = 486 knots
  • Sound (Mach 1): 1,235 km/h = 767 mph = 343 m/s

Practical Applications

  • Driving: Understanding speed limits when traveling abroad
  • Aviation: Flight speeds, wind speeds, aircraft specifications
  • Maritime: Boat speeds, current speeds, navigation
  • Sports: Running pace, cycling speed, swimming velocity
  • Weather: Wind speed measurements, storm tracking
  • Physics: Velocity calculations, kinematic problems

Science-Backed

Based on proven research

Easy to Follow

Simple steps for everyone

Instant Results

Get answers immediately

💡 Pro Tip: Speed conversions combine distance and time conversions: km/h = (distance in km) / (time in hours)
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Frequently Asked Questions

Find answers to common questions about speed conversion

Quick method: Multiply by 0.6 (or divide by 1.6). Example: 100 km/h × 0.6 = 60 mph (actual: 62.14 mph). Exact formula: km/h × 0.621371. For precision: 80 km/h = 49.7 mph, 100 km/h = 62.1 mph, 120 km/h = 74.6 mph.

100 km/h = 62.1371 mph (approximately 62 mph). This is a common highway speed. Other references: 50 km/h = 31 mph (city), 80 km/h = 50 mph, 130 km/h = 81 mph (European highways).

60 mph = 96.56 km/h (approximately 97 km/h). Common speed limit conversions: 55 mph = 89 km/h, 65 mph = 105 km/h, 70 mph = 113 km/h, 75 mph = 121 km/h. Useful for US travelers in Europe/Asia.

1 knot = 1 nautical mile per hour = 1.852 km/h = 1.151 mph. Used in maritime and aviation. Named because sailors used knotted rope to measure speed. Example: Aircraft cruises at 450 knots = 833 km/h = 518 mph. Ship speed: 20 knots = 37 km/h = 23 mph.

Multiply by 3.6. Formula: km/h = m/s × 3.6. Example: 25 m/s × 3.6 = 90 km/h. Quick check: 10 m/s = 36 km/h, 20 m/s = 72 km/h, 30 m/s = 108 km/h. This is why speed = distance/time works: (meters/second) × (3600 seconds/hour) ÷ (1000 meters/km) = 3.6.

Speed of sound (Mach 1) at sea level: 343 m/s = 1,235 km/h = 767 mph = 661 knots. Varies with temperature and altitude. At cruising altitude (cold): ~295 m/s = 1,062 km/h = 660 mph. Supersonic = faster than sound. Hypersonic = Mach 5+.

Usain Bolt's peak speed: 44.72 km/h = 27.78 mph = 12.42 m/s (during 100m world record). Average speed for 100m: 37.58 km/h = 23.35 mph = 10.44 m/s. Top marathon runners: ~21 km/h = 13 mph = 5.8 m/s sustained.

Knots relate to nautical miles, which are based on Earth's latitude/longitude grid. 1 nautical mile = 1 minute of latitude. Makes navigation easier - distance on chart = distance traveled. Knots are international aviation/maritime standard. Most convenient for global navigation.

Still have questions? Feel free to leave a comment below and we'll help you out!

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