Length
result = value · factor1 km =0.621371 mi
- Full namekilometer → statute mile
- 1 km equals0.62137119 mi
- The other way, 1 mi equals1.609344 km
Converters
Units
Length, mass, volume, area, speed, temperature, data and energy.
The converters work from exact values rather than rounded ones: an inch is exactly 2.54 cm, a pound is 0.45359237 kg and a mile is 1.609344 km. For digital data, decimal and binary units are kept apart, because a gigabyte and a gibibyte differ by almost 7 %.
Calculators
9Mass
result = value · factor1 kg =2.204623 lb
- Full namekilogram → pound
- 1 kg equals2.20462262 lb
- The other way, 1 lb equals0.45359237 kg
Volume
result = value · factor1 l =0.264172 gal
- Full nameliter → US gallon
- 1 l equals0.26417205 gal
- The other way, 1 gal equals3.78541178 l
Area
result = value · factor1 ha =10,000 m²
- Full namehectare → square meter
- 1 ha equals10,000 m²
- The other way, 1 m² equals0.0001 ha
Speed
result = value · factor1 km/h =0.621371 mph
- Full namekilometers per hour → miles per hour
- 1 km/h equals0.62137119 mph
- The other way, 1 mph equals1.609344 km/h
Digital data
result = value · factor1 GB =0.931323 GiB
- Full namegigabyte → gibibyte
- 1 GB equals0.93132257 GiB
- The other way, 1 GiB equals1.07374182 GB
Energy
result = value · factor1 kcal =4.184 kJ
- Full namekilocalorie → kilojoule
- 1 kcal equals4.184 kJ
- The other way, 1 kJ equals0.23900574 kcal
Temperature
°F = °C · 9/5 + 32, K = °C + 273,15In degrees Celsius21 °C
- Fahrenheit69.8 °F
- Kelvins294.15 K
- Feels likepleasant
Running pace
pace = 60 / speedPace5:00 min/km
- Time over the distance1 hr 45 min
- Speed in m/s3.333
- Distance per hour12 km
Tables and cheat sheets
2SI prefixes
the multiplier attached to the base unit| Prefix | Symbol | Multiplier | Exponential notation |
|---|---|---|---|
| tera | T | 1,000,000,000,000 | 10¹² |
| giga | G | 1,000,000,000 | 10⁹ |
| mega | M | 1,000,000 | 10⁶ |
| kilo | k | 1,000 | 10³ |
| hecto | h | 100 | 10² |
| deca | da | 10 | 10¹ |
| no prefix | 1 | 10⁰ | |
| deci | d | 0.1 | 10⁻¹ |
| cents | c | 0.01 | 10⁻² |
| milli | m | 0.001 | 10⁻³ |
| micro | µ | 0.000001 | 10⁻⁶ |
| nano | n | 0.000000001 | 10⁻⁹ |
US customary units
exact values, not rounded ones| Unit | In metric units | The other way |
|---|---|---|
| 1 inch | 2.54 cm | 1 cm = 0.3937 inches |
| 1 foot | 30.48 cm | 1 m = 3.2808 feet |
| 1 yard | 0,9144 m | 1 m = 1.0936 yards |
| 1 statute mile | 1.609344 km | 1 km = 0.6214 miles |
| 1 nautical mile | 1.852 km | 1 km = 0.5400 nautical miles |
| 1 pound | 0.45359237 kg | 1 kg = 2.2046 pounds |
| 1 ounce | 28,3495 g | 1 kg = 35.274 ounces |
| 1 US gallon | 3,785412 l | 1 l = 0.2642 gallons |
| 1 acre | 4046.86 m² (0.4047 ha) | 1 ha = 2.4711 acres |
Worked examples with full solutions
1Speed from miles to kilometers
A 65 mile per hour speed limit — how many kilometers per hour is that? And how many minutes does 15 km take at that speed?
- 1 mile is 1.609344 km
65 · 1.609344 = 104.6 km/h - Time is distance divided by speed
15 / 104.6 = 0.1434 hours - Convert to minutes
0.1434 · 60 = 8.6 minutes
Answer: 65 miles per hour is 104.6 km/h, and 15 km takes about 8 minutes 36 seconds.
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