Common Conversion Factors

Length

Metric System

Conversion	Factor
1 kilometer (km)	1000 meters (m)
1 meter (m)	100 centimeters (cm)
1 centimeter (cm)	10 millimeters (mm)
1 meter (m)	1000 millimeters (mm)

Imperial System

Conversion	Factor
1 mile (mi)	5280 feet (ft)
1 mile (mi)	1760 yards (yd)
1 yard (yd)	3 feet (ft)
1 foot (ft)	12 inches (in)

Metric to Imperial

Conversion	Factor
1 inch	2.54 cm
1 foot	0.3048 m
1 mile	1.609 km
1 meter	3.281 feet
1 kilometer	0.621 miles

Area

Conversion	Factor
1 square meter (m²)	10,000 cm²
1 hectare (ha)	10,000 m²
1 square kilometer (km²)	100 hectares
1 square foot (ft²)	144 square inches (in²)
1 acre	43,560 ft²
1 square mile	640 acres
1 m²	10.764 ft²
1 hectare	2.471 acres

Volume

Metric System

Conversion	Factor
1 liter (L)	1000 milliliters (mL)
1 liter (L)	1000 cubic centimeters (cm³)
1 cubic meter (m³)	1000 liters

Imperial System

Conversion	Factor
1 gallon (gal)	4 quarts (qt)
1 quart (qt)	2 pints (pt)
1 pint (pt)	2 cups (c)
1 cup (c)	8 fluid ounces (fl oz)
1 gallon	128 fluid ounces

Metric to Imperial

Conversion	Factor
1 liter	0.264 gallons
1 gallon	3.785 liters
1 fluid ounce	29.57 mL
1 cubic foot	7.481 gallons

Mass/Weight

Metric System

Conversion	Factor
1 kilogram (kg)	1000 grams (g)
1 gram (g)	1000 milligrams (mg)
1 metric ton	1000 kg

Imperial System

Conversion	Factor
1 pound (lb)	16 ounces (oz)
1 ton (US)	2000 pounds

Metric to Imperial

Conversion	Factor
1 kilogram	2.205 pounds
1 pound	0.454 kg
1 ounce	28.35 grams

Time

Conversion	Factor
1 minute	60 seconds
1 hour	60 minutes
1 hour	3600 seconds
1 day	24 hours
1 week	7 days
1 year	365 days (or 366 leap)
1 year	52 weeks

Speed

Conversion	Factor
1 mph	1.467 ft/s
1 mph	1.609 km/h
1 km/h	0.621 mph
1 m/s	3.6 km/h
1 m/s	2.237 mph
1 knot	1.151 mph

Temperature

Conversion Formulas

$°C = (°F - 32) \times \frac{5}{9}$

$°F = °C \times \frac{9}{5} + 32$

$K = °C + 273.15$

$°C = K - 273.15$

Common Reference Points

Point	°C	°F	K
Absolute Zero	$-273.15$	$-459.67$	$0$
Water Freezes	$0$	$32$	$273.15$
Room Temp	$20$–$25$	$68$–$77$	$293$–$298$
Body Temp	$37$	$98.6$	$310.15$
Water Boils	$100$	$212$	$373.15$