Sources & methodology
Formulas and conversion factors in this section follow:
2 tools
Speed Converters
km/h ↔ mph shortcuts.
Speed limits, treadmill displays, and wind forecasts switch between kilometres per hour and miles per hour depending on the country. These converters give you the equivalent instantly so you can compare a 100 km/h limit with a 60 mph one, or set a treadmill in mph to match a training plan written in km/h.
Because the mile is defined as exactly 1.609344 km, 1 mph = 1.609344 km/h and 1 km/h ≈ 0.621371 mph. For per-kilometre or per-mile running pace rather than speed, see the Running Pace calculator in Health & Fitness.
All speed converters
Pick a tool to see the calculator, formula, worked example, and FAQs.
Explore other categories
More free tools across health, finance, math, and unit conversion.
7 tools
Universal Converters
Any unit → any unit: length, weight, time, and more.
12 tools
Health & Fitness
BMI, macros, protein, pace, sleep, and more.
8 tools
Length Converters
Popular length pairs including feet ↔ cm.
6 tools
Weight Converters
Popular weight pairs like kg ↔ lbs.
4 tools
Temperature Converters
Celsius, Fahrenheit, Kelvin shortcuts.
5 tools
Time Converters
Seconds ↔ HH:MM:SS and other time shortcuts.
4 tools
Volume Converters
Liters, gallons, cups shortcuts.
3 tools
Area Converters
m², ft², acres shortcuts.
4 tools
Science Units
Pressure, energy, power, and angles.
1 tools
Data Size
Convert bytes, KB, MB, GB, and TB.
1 tools
Cooking & Baking
Ingredient cup ↔ gram style conversions.
8 tools
Finance
Tips, discounts, EMI, tax, salary, interest.
11 tools
Everyday Math
Percentages, age, GPA, averages, and more.