Calculator/Speed Converter/ Speed Unit Converter

Understanding Speed
Physics Definition of Speed
  • Velocity: A physical quantity representing distance traveled per unit time
  • Formula: Speed = Distance ÷ Time (v = d/t)
  • Vector Quantity: A physical quantity with both magnitude and direction
  • Speed: A scalar quantity without considering direction
Physics Concepts Related to Speed
  • Relationship with Acceleration: Acceleration: Rate of change of velocity (a = Δv/Δt)
  • Relative Speed: Definition: Speed difference according to observers reference frame
Speed Unit Converter
Quick Settings:
Kilometers/Hour (km/h)

100.00

Miles/Hour (mph)

62.14

Meters/Second (m/s)

27.78

Knot (kn)

53.996

Mach (Mach)

0.082

Feet/Second (ft/s)

91.134

Calculate Speed from Distance and Time
Hours
Minutes
Seconds
Relative Speed Calculator

Calculate the relative speed between two objects. Consider cases of movement in the same direction or opposite directions.

Object 1
Object 2
Speed Comparison Chart
Examples of Various Speeds
Walking

5 km/h

Bicycle

20 km/h

Car

60 km/h

High-speed Train

300 km/h

Passenger Aircraft

900 km/h

Rocket

11.2 km/s

Detailed Description of Major Speed Units

  • Usage: Cars, trains, and general land transportation
  • Feature: The most familiar speed unit in daily life
  • Reference Values:
  • • City road speed limit: 50-60 km/h
  • • Highway speed limit: 100-110 km/h
  • • High-speed rail (KTX): Maximum 330 km/h

  • Usage: Standard SI unit in science and engineering
  • Feature: Fundamental use in physics calculations
  • Reference Values:
  • • Average walking speed: 1.4 m/s
  • • 100m world record: Approximately 10.44 m/s
  • • Free fall terminal velocity: Approximately 56 m/s

  • Usage: United States, United Kingdom, and other English-speaking countries
  • Feature: 1 mile = 1.609344 km
  • Reference Values:
  • • US highway speed limit: 65-80 mph
  • • F1 car maximum speed: Approximately 230 mph

  • Usage: Exclusive to aviation and maritime
  • Definition: 1 nautical mile per hour
  • Feature: 1 knot = 1.852 km/h
  • Reference Values:
  • • General passenger ship: 20-25 knots
  • • Aircraft cruising speed: 400-500 knots
  • • Speedboat: 40-60 knots

  • Usage: Supersonic aircraft, missiles, etc.
  • Definition: Relative speed to the speed of sound (speed of sound ≈ 340 m/s)
  • Classification:
  • • Subsonic: Less than Mach 0.8
  • • Supersonic: Mach 1.2 or greater
  • • Hypersonic: Mach 5 or greater
  • Reference Values:
  • • Concorde: Mach 2.04
  • • SR-71: Mach 3.3
  • • Intercontinental Ballistic Missile: Mach 20+
Application Fields of Speed Units
Transportation and Transit

Automotive engineering, air traffic control, maritime transport, railway operations

Sports and Recreation

Track and field, motor racing, cycling, swimming

Science and Research

Physics experiments, meteorology, astronomy, biology