Complete Unit Conversion Chart

Length & Distance

Length and Distance Conversions

Common conversions

Conversion	Reverse Conversion	Type
1 in = 2.54 cm	1 cm ≈ 0.393701 in	Exact
1 ft = 12 in	1 in = 1/12 ft ≈ 0.083333 ft	Exact
1 yd = 3 ft	1 ft = 1/3 yd ≈ 0.333333 yd	Exact
1 yd = 36 in	1 in = 1/36 yd ≈ 0.027778 yd	Exact
1 mi = 5,280 ft	1 ft ≈ 0.000189394 mi	Exact
1 mi = 1,760 yd	1 yd ≈ 0.000568182 mi	Exact
1 mm = 0.1 cm	1 cm = 10 mm	Exact
1 cm = 10 mm	1 mm = 0.1 cm	Exact
1 m = 100 cm	1 cm = 0.01 m	Exact
1 m = 1,000 mm	1 mm = 0.001 m	Exact
1 km = 1,000 m	1 m = 0.001 km	Exact
1 ft = 0.3048 m	1 m ≈ 3.28084 ft	Exact
1 yd = 0.9144 m	1 m ≈ 1.09361 yd	Exact
1 mi = 1.609344 km	1 km ≈ 0.621371 mi	Exact
1 nautical mile = 1.852 km	1 km ≈ 0.539957 nautical mi	Exact
1 nautical mile = 1,852 m	1 m ≈ 0.000539957 nautical mi	Exact

Area

Area Conversions

Conversion	Reverse Conversion	Type
1 ft² = 144 in²	1 in² ≈ 0.00694444 ft²	Exact
1 yd² = 9 ft²	1 ft² ≈ 0.111111 yd²	Exact
1 acre = 43,560 ft²	1 ft² ≈ 0.0000229568 acre	Exact
1 mi² = 640 acres	1 acre = 0.0015625 mi²	Exact
1 m² = 10,000 cm²	1 cm² = 0.0001 m²	Exact
1 km² = 1,000,000 m²	1 m² = 0.000001 km²	Exact
1 hectare = 10,000 m²	1 m² = 0.0001 hectare	Exact
1 acre ≈ 4,046.8564224 m²	1 m² ≈ 0.000247105 acre	Exact
1 acre ≈ 0.404686 hectare	1 hectare ≈ 2.47105 acres	Approx.
1 mi² ≈ 2.589988 km²	1 km² ≈ 0.386102 mi²	Exact

Volume & Cubic Units

Cubic Volume Conversions

Conversion	Reverse Conversion	Type
1 ft³ = 1,728 in³	1 in³ ≈ 0.000578704 ft³	Exact
1 yd³ = 27 ft³	1 ft³ ≈ 0.037037 yd³	Exact
1 cm³ = 1 mL	1 mL = 1 cm³	Exact
1 dm³ = 1 L	1 L = 1 dm³	Exact
1 m³ = 1,000 L	1 L = 0.001 m³	Exact
1 m³ = 1,000,000 cm³	1 cm³ = 0.000001 m³	Exact
1 ft³ ≈ 28.316846592 L	1 L ≈ 0.0353147 ft³	Exact
1 in³ ≈ 16.387064 mL	1 mL ≈ 0.0610237 in³	Exact

Liquid Capacity

Liquid and Capacity Conversions

Conversion	Reverse Conversion	System
1 tbsp = 3 tsp	1 tsp = 1/3 tbsp	U.S.
1 fl oz = 2 tbsp	1 tbsp = 0.5 fl oz	U.S.
1 cup = 8 fl oz	1 fl oz = 0.125 cup	U.S.
1 pint = 2 cups	1 cup = 0.5 pint	U.S.
1 quart = 2 pints	1 pint = 0.5 quart	U.S.
1 gallon = 4 quarts	1 quart = 0.25 gallon	U.S.
1 gallon = 16 cups	1 cup = 0.0625 gallon	U.S.
1 L = 1,000 mL	1 mL = 0.001 L	Metric
1 U.S. gal = 3.785411784 L	1 L ≈ 0.264172 U.S. gal	U.S.
1 U.S. qt ≈ 0.946353 L	1 L ≈ 1.05669 U.S. qt	U.S.
1 U.S. cup ≈ 236.588 mL	1 mL ≈ 0.00422675 U.S. cup	U.S.
1 U.S. fl oz ≈ 29.5735 mL	1 mL ≈ 0.033814 U.S. fl oz	U.S.
1 Imperial gal = 4.54609 L	1 L ≈ 0.219969 Imperial gal	Imperial

Mass & Weight

Mass and Weight Conversions

Conversion	Reverse Conversion	Type
1 lb = 16 oz	1 oz = 0.0625 lb	Exact
1 U.S. ton = 2,000 lb	1 lb = 0.0005 U.S. ton	Exact
1 g = 1,000 mg	1 mg = 0.001 g	Exact
1 kg = 1,000 g	1 g = 0.001 kg	Exact
1 metric tonne = 1,000 kg	1 kg = 0.001 metric tonne	Exact
1 lb = 0.45359237 kg	1 kg ≈ 2.20462 lb	Exact
1 oz = 28.349523125 g	1 g ≈ 0.035274 oz	Exact
1 kg ≈ 35.274 oz	1 oz ≈ 0.0283495 kg	Approx.

Time

Time Conversions

Conversion	Reverse Conversion	Type
1 min = 60 s	1 s = 1/60 min	Exact
1 hr = 60 min	1 min = 1/60 hr	Exact
1 hr = 3,600 s	1 s = 1/3,600 hr	Exact
1 day = 24 hr	1 hr = 1/24 day	Exact
1 week = 7 days	1 day = 1/7 week	Exact
1 common year = 365 days	1 day = 1/365 common year	Calendar
1 leap year = 366 days	1 day = 1/366 leap year	Calendar
1 ms = 0.001 s	1 s = 1,000 ms	Exact
1 μs = 0.000001 s	1 s = 1,000,000 μs	Exact
1 ns = 0.000000001 s	1 s = 1,000,000,000 ns	Exact

Speed

Speed Conversions

Conversion	Reverse Conversion	Type
1 mph = 1.4666667 ft/s	1 ft/s ≈ 0.681818 mph	Approx.
1 mph = 1.609344 km/h	1 km/h ≈ 0.621371 mph	Exact
1 m/s = 3.6 km/h	1 km/h ≈ 0.277778 m/s	Exact
1 m/s ≈ 2.23694 mph	1 mph = 0.44704 m/s	Approx.
1 knot = 1.852 km/h	1 km/h ≈ 0.539957 knot	Exact
1 knot ≈ 1.15078 mph	1 mph ≈ 0.868976 knot	Approx.

Temperature

Temperature Conversion Formulas

From	To	Formula
Celsius	Fahrenheit	°F = (°C × 9/5) + 32
Fahrenheit	Celsius	°C = (°F − 32) × 5/9
Celsius	Kelvin	K = °C + 273.15
Kelvin	Celsius	°C = K − 273.15
Fahrenheit	Kelvin	K = (°F − 32) × 5/9 + 273.15
Kelvin	Fahrenheit	°F = (K − 273.15) × 9/5 + 32

Metric Prefixes

Metric Prefix Chart

Prefix	Symbol	Power of 10	Decimal Value
tera	T	10¹²	1,000,000,000,000
giga	G	10⁹	1,000,000,000
mega	M	10⁶	1,000,000
kilo	k	10³	1,000
hecto	h	10²	100
deka	da	10¹	10
base unit	—	10⁰	1
deci	d	10⁻¹	0.1
centi	c	10⁻²	0.01
milli	m	10⁻³	0.001
micro	μ	10⁻⁶	0.000001
nano	n	10⁻⁹	0.000000001
pico	p	10⁻¹²	0.000000000001

Cooking

Common Cooking Conversions

Conversion	Reverse Conversion	System
1 tbsp = 3 tsp	1 tsp = 1/3 tbsp	U.S.
1 cup = 16 tbsp	1 tbsp = 1/16 cup	U.S.
1 cup = 48 tsp	1 tsp = 1/48 cup	U.S.
1 cup = 8 fl oz	1 fl oz = 1/8 cup	U.S.
1 pint = 2 cups	1 cup = 0.5 pint	U.S.
1 quart = 4 cups	1 cup = 0.25 quart	U.S.
1 gallon = 16 cups	1 cup = 1/16 gallon	U.S.
1 cup ≈ 236.588 mL	1 mL ≈ 0.00422675 cup	U.S. ↔ Metric
1 tbsp ≈ 14.7868 mL	1 mL ≈ 0.067628 tbsp	U.S. ↔ Metric
1 tsp ≈ 4.92892 mL	1 mL ≈ 0.202884 tsp	U.S. ↔ Metric

Digital / Data

Digital Storage and Data Conversions

Decimal and binary prefixes are different.

SI prefixes such as kB and MB use powers of 1,000. Binary prefixes such as KiB and MiB use powers of 1,024.

Conversion	Value	System
1 byte = 8 bits	8 bits	Digital
1 kB = 1,000 bytes	10³ bytes	SI decimal
1 MB = 1,000 kB	10⁶ bytes	SI decimal
1 GB = 1,000 MB	10⁹ bytes	SI decimal
1 TB = 1,000 GB	10¹² bytes	SI decimal
1 KiB = 1,024 bytes	2¹⁰ bytes	Binary
1 MiB = 1,024 KiB	2²⁰ bytes	Binary
1 GiB = 1,024 MiB	2³⁰ bytes	Binary
1 TiB = 1,024 GiB	2⁴⁰ bytes	Binary