 Å

A symbol for the measurement unit Ångström.
 Ångström

A unit of length defined as exactly 1x10^{10} meters.
Symbol: Å.
 µ

(1) A symbol for the measurement unit prefix micro.
(2) A symbol for the measurement unit micron.
 a

(1) A symbol for the measurement unit prefix atto.
(2) A symbol for the measurement unit are, a unit of area.
 acre

A unit of area defined as 43,560 square feet and equivalent to 4.046873x10^{3} square meters.
 acre foot

A unit of volume equivalent to 1.2335x10^{3} cubic meters.
 are

A unit of area defined as exactly 100 square meters.
Symbol: a.
 area

A class of derived unit constructed by multiplying together two units of length.
 astronomical unit

A unit of length equivalent to 1.495979x10^{11} meters.
 atto

A unit prefix equivalent to 10^{18}.
Symbol: a.
 b

Symbol for the measurement unit barn.
 bag

A unit of volume equivalent to 12 pecks.
 barn

A unit of reaction probability expressed as an area and defined as exactly 10^{28} square meters, or commonly as 10^{24} square centimeters.
Symbol: b.
 barrel

(1) For petroleum it is a unit of volume equivalent to 42 gallons.
(2) For spirits it is a unit of volume equivalent to 40 gallons.
(3) For wine it is a unit of volume equivalent to 31.5 gallons.
(4) For beer it is a unit of volume equivalent to 31 gallons.
(5) For shipping it is a unit of volume equivalent to 5 cubic feet.
 bite

A unit of length equivalent to 25 inches.
 board foot

A unit of volume equivalent to 2.359737x10^{3} cubic meters.
 bolt

(1) For cotton it is a unit of length equivalent to 40 yards.
(2) For wool it is a unit of length equivalent to 70 yards.
 British standard

A unit of volume equivalent to 165 cubic feet.
 bushel

A unit of volume equivalent to 3.523907x10^{2} cubic meters.
 c

(1) A symbol for the measurement unit prefix centi.
(2) A symbol for the measurement unit carat, a unit of mass.
(3) An early symbol for the measurement unit curie, a unit of radioactivity.
 C

(1) A symbol for the measurement unit coulomb, a unit of electrical charge.
(2) A symbol for the measurement unit Celsius, a unit of temperature.
(3) An early symbol for the measurement unit curie, a unit of radioactivity.
 cable length

A unit of length equivalent to 120 fathoms.
 centi

A measurement unit prefix equivalent to 10^{2}.
Symbol: c.
 cc

A symbol for cubic centimeter.
 circular mil

A unit of area equivalent to 5.067075x10^{10} square meters.
 cm^{3}

A symbol for cubic centimeter.
 cord

A unit of volume equivalent to 3.624556 cubic meters.
 cord foot

A unit of volume equivalent to 16 cubic feet.
 cubic centimeter

A unit of volume defined as exactly 1x10^{3} liters and as exactly 1x10^{6} cubic meters.
Symbols: cm^{3}; cc.
 cubic foot

A unit of volume equivalent to 2.831685x10^{3} cubic meters.
Symbol: ft^{3}.
 cubic inch

A unit of volume equivalent to 1.638706x10^{5} cubic meters.
Symbol: in^{3}.
 cubic meter

The SI standard unit of volume.
Symbol: m^{3}.
 cubic mile

A unit of volume equivalent to 4.168182x10^{9} cubic meters.
Symbol: mi^{3}.
 cubic yard

A unit of volume equivalent to 7.645549x10^{1} cubic meters.
Symbol: yd^{3}.
 cubit

A unit of length equivalent to 18 inches.
 cut

A unit of length equivalent to 300 yards.
 d

(1) A symbol for the measurement unit prefix deci.
(2) A symbol for the measurement unit day, a unit of time.
 day

A unit of time defined as exactly 86,400 sseconds, and as exactly 1,400 minutes, and as exactly 24 hours.
Symbol: d.
 da

A symbol for the measurement unit prefix deka.
 darcy

A unit of area equivalent to 9.869233x10^{13} square meters.
 deci

A measurement unit prefix equivalent to 10^{1}.
Symbol: d.
 degree

(1) A unit of length equivalent to 69.04677 miles.
(2) A unit of plane angle equivalent to π/180 radians, approximately 1.745329x10^{2} radians. The (plane angle) degree is not an SI unit but its use is valid unit within the International System of units.
 deka

A measurement unit prefix equivalent to 10^{1}.
Symbol: da.
 displacement ton

A unit of volume equivalent to 35 cubic feet.
 dram

It is a unit of volume equivalent to 0.125 liquid ounces.
 E

(1) A symbol for the measurement unit prefix exa.
 english ell

A unit of length defined as 45 inches and equivalent to 1.143 meters.
 exa

A measurement unit prefix equivalent to 10^{18}.
Symbol: D.
 f

(1) A symbol for the measurement unit prefix femto.
 fathom

A unit of length equivalent to exactly 6 feet or 1.8288 meters.
 feet per hour

A unit of velocity equivalent to 8.466667x10^{5} meters per second.
Symbol: ft/h.
 feet per minute

A unit of velocity equivalent to 5.08x10^{3} meters per second.
Symbol: ft/min.
 feet per second

A unit of velocity equivalent to 0.3048 meters per second.
Symbol: ft/s.
 femto

A measurement unit prefix equivalent to 10^{15}.
Symbol: f.
 femtometer

A synonym for the measurement unit fermi.
 fermi

A unit of length defined as exactly 1x10^{15} meters.
Symbol: fm.
Synonym: femtometer.
 finger

A unit of length defined as 4.5 inches and equivalent to 1.143x10^{1} meters.
 flemish ell

A unit of length equivalent to 27 inches.
 fl oz

A symbol for fluid ounce.
 fm

A symbol for fermi.
 foot

A unit of length equivalent to 12 inches and defined as exactly 3.048x10^{1} meters.
Symbol: ft.
 ft

A symbol for foot.
 ft^{2}

A symbol for square foot.
 ft^{3}

A symbol for cubic foot.
Symbol: ft^{3}.
 ft/h

A symbol for feet per hour.
 ft/min

A symbol for feet per minute.
 ft/s

A symbol for feet per second.
 furlong

A unit of length equivalent to 220 yards.
 G

(1) A symbol for the measurement unit prefix giga.
(2) A symbol for the measurement unit gauss.
 gal

A symbol for gallon.
 gallon

A unit of volume defined as exactly 4.54609x10^{3} cubic meters.
Symbol: gal.
 giga

A measurement unit prefix equivalent to 10^{9}.
Symbol: G.
 gill

A unit of volume equivalent to 1.182941x10^{4} cubic meters.
 h

(1) A symbol for the measurement unit prefix hecto.
(2) A symbol for the measurement unit hour, a unit of time.
 ha

A symbol for the measurement unit hectare.
 hairsbreadth

A unit of length equivalent to 5.29x10^{4} meters.
 hand

A unit of length equivalent to 4 inches.
 handsbreadth

A unit of length equivalent to 3 inches.
 hank

(1) For cotton it is a unit of length equivalent to 560 yards.
(2) For wool it is a unit of length equivalent to 840 yards.
 hectare

A unit of area defined as exactly 1x10^{4} square meters.
Symbol: ha.
 hecto

A measurement unit prefix equivalent to 10^{2}.
Symbol: h.
 heer

A unit of length equivalent to 600 yards.
 hogshead

A unit of volume equivalent to 63 gallons.
 hour

A unit of time defined as exactly 3600 seconds, and as exactly 60 minutes.
Symbol: h; hr.
 hr

A symbol for hour.
 in

A symbol for inch.
 in^{2}

A symbol for square inch.
 in^{3}

A symbol for cubic inch.
 inch

A unit of length defined as exactly 2.54x10^{2} meters, 2.54 centimeters.
Symbol: in.
 inches per second

A unit of velocity defined as exactly 2.54x102 meters per second.
Symbol: in/s.
 in/s

A symbol for inches per second.
 iron

A unit of length equivalent to 0.020833 inches.
 k

A symbol for the measurement unit prefix kilo.
 kilo

A measurement unit prefix equivalent to 10^{3}.
Symbol: k.
 keel

A unit of volume equivalent to 350 cubic feet.
 kilometers per hour

A unit of velocity 2.777778x10^{1} meters per second.
Symbol: kph.
 km/h

A symbol for kilometers per hour.
 knot

A unit of velocity defined exactly as 1 nautical mile per hour and equivalent to 5.14444x10^{1} meters per second.
Synonym: nautical miles per hour.
 kph

A symbol for kilometers per hour.
 lea

A unit of length equivalent to 360 feet.
 league

A unit of length equivalent to 3 nautical miles.
 light year

A unit of length equivalent to 9.46073x10^{15} meters.
 line

A unit of length defined as 0.025 inches and equivalent to 2.11667 meters.
 link

A unit of length equivalent to 7.92 inches.
 liter

A unit of volume defined as exactly 1x10^{3} cubic meters. The liter is not an SI unit but its use is valid unit within the International System of units.
Symbol: L.
 load

For shipping it is a unit of volume equivalent to 800 cubic feet.
 m

(1) A symbol for the measurement unit prefix milli.
(2) A symbol for the measurement unit meter, a unit of length.
(3) A symbol for the measurement unit minute, a unit of time.
(4) A symbol for the measurement unit molal, a unit of chemical concentration.
 M

(1) A symbol for the measurement unit prefix mega.
(2) A symbol for the measurement unit Mach, a unit of velocity.
(3) A symbol for the measurement unit molar, a unit of chemical concentration.
 m^{2}

A symbol for square meter.
 m^{3}

A symbol for cubic meter.
 marine league

A unit of length equivalent to 3 nautical miles.
 Mark Twain

A unit of length equivalent to 2 fathoms.
 mb

A symbol for millibarn.
 mega

A measurement unit prefix equivalent to 10^{6}.
Symbol: M.
 meter

The SI standard unit of length.
Symbol: m.
 meters per second

The SI standard unit for velocity.
Symbol: m/s; mps.
 mi

A symbol for mile.
 mi^{2}

Symbol for the measurement unit square mile.
 mi^{3}

A symbol for cubic mile.
 micro

A measurement unit prefix equivalent to 10^{6}.
Symbol: µ.
 microinch

A unit of length defined as exactly 2.54x10^{8} meters.
 micron

A unit of length defined as exactly 1x10^{6} meters.
Symbol: µ.
 mi/h

A symbol for miles per hour.
 mil

(1) A unit of length equivalent to 0.001 inches and defined as exactly 2.54x10^{5} meters.
(2) A unit of plane angle equivalent to 9.817447x10^{4} radians.
 mile

A unit of length equivalent to 5,280 feet and 1.609344x10^{3} meters.
 miles per hour

A unit of velocity defined as exactly 4.4704x10^{1} meters per second, and as exactly 1.609344 km/h.
Symbols: mi/h; mph.
 miles per minute

A unit of velocity defined as exactly 2.68224x10^{1} meters per minute.
Symbol: mi/min.
 miles per second

A unit of velocity defined as exactly 1.609344x10^{3} meters per second.
Symbol: mi/s.
 milli

A measurement unit prefix equivalent to 10^{3}.
Symbol: m.
 millibarn

A unit of reaction probability which is expressed as an area and is equivalent to 10^{3} barn.
Symbol: mb.
 mi/min

A symbol for miles per minute.
 min

A symbol for min.
 minute

A unit of time defined as exactly 60 seconds.
Symbol: min.
 mi/s

A symbol for miles per second.
 mo

A symbol for month.
 month

A unit of time equivalent to 2.628x10^{6} seconds.
Symbol: mo.
 mph

A symbol for miles per hour.
 mps

A symbol for meters per second.
 m/s

A symbol for meters per second.
 nail

A unit of length defined as one half finger and equivalent to 2.25 inches.
 mutchkin

A unit of volume equivalent to 3 imperial gills.
 nano

A measurement unit prefix equivalent to 10^{9}.
Symbol: n.
 nautical mile

A unit of length equivalent to 1,852 meters.
 nautical miles per hour

A synonym for knot.
 ounce

A unit of volume equivalent to 2.957353x10^{5} cubic meters.
 p

A symbol for the measurement unit prefix pico.
 P

(1) A symbol for the measurement unit prefix peta.
(2) A symbol for the measurement unit poise, a unit of viscosity.
 Pa

A symbol for the measurement unit pascal, a unit of pressure.
 palm


A synonym for the measurement unit handsbreadth.
 parsec

A unit of length equivalent to 3.085678x10^{16} meters.
 peck

A unit of volume equivalent to 8.809768x10^{3} cubic meters.
 perch

(1) A synonym for the measurement unit rod.
(2) A unit of volume equivalent to 24.75 cubic feet.
 peta

A measurement unit prefix equivalent to 10^{15}.
Symbol: P.
 pica

A unit of length defined as 1/6 inch and equivalent to 4.2333x10^{3} meters.
 pico

A measurement unit prefix equivalent to 10^{12}.
Symbol: p.
 pin

A unit of volume equivalent to 4.5 imperial gallons.
 point

(1) A unit of length defined as 1/72 inches and equivalent to 3.514598x10^{4} meters.
(2) A unit of mass defined as 2 milligrams inches and equivalent to 2.x10^{3} grams.
 pole

A synonym for the measurement unit rod.
 qt

A symbol for the measurement unit quart.
 quarter

(1) A synonym for the measurement unit span.
(2) A unit of mass defined as 5 blocks and equivalent to 5.x10^{2} grams.
 quarteron

A unit of area defined as 1.76 square meters.
 rd

Symbol for the measurement unit rod.
 reed

A unit of length defined as 108 inches and equivalent to 2.7432 meters.
 rod

A unit of length equivalent to 5.029210 meters.
Symbol: rd.
Synonyms: perch; pole.
 roll

For wall paper, it is a unit of area defined as 30 square feet and equivalent to 2.787 square meters.
 rope

A unit of length defined as 20 feet.
 s

A symbol for second.
 scottish ell

A unit of length defined as 37 inches.
 scruple

A unit of volume equivalent to 6.48524x10^{2} milliliters.
 seam

A unit of volume equivalent to 8 bushels.
 sec

A symbol for second.
 second

The SI standard unit of time.
Symbol: s; sec.
 shaftment

A unit of length defined as 6 inches.
Synonym: shathmont.
 shathmont

A synonym for the measurement unit shaftment.
 shake

A unit of time defined as exactly 1x10^{8} seconds.
 shipload

For shipping it is a unit of volume defined as exactly 7,000 cubic feet.
 siegbohn

A unit of length defined as 1x10^{13} meters.
 silversmith’s point

A unit of length defined as 0.00025 inches and equivalent to 6.35x10^{6} meters.
 skein

A unit of length defined as 360 feet and equivalent to 1.09728x10^{2} meters.
 span

A unit of length defined as 9 inches and equivalent to 2.286x10^{1} meters.
Synonym: quarter.
 speed of light

A synonym for speed of light in a vacuum.
 speed of light in a vacuum

The distance that light travels in a vacuum per unit time. It has a value (1998 CODATA) of exactly 2.99792458x10^{8} meters per second.
Symbols: c; c_{0}.
 speed of sound

The speed at which sound travels in a given medium under specified conditions. The speed of sound at sea level in the International Standard Atmosphere is 1108 feet per second or 1215 kilometers per hour.
 square foot

A unit of area defined as 144 square inches and equivalent to 9.290304x10^{2} square meters.
Symbol: ft^{2}.
 square inch

A unit of area defined as exactly 6.4516x10^{4} square meters.
Symbol: in^{2}.
 square meter

The SI standard unit of area.
Symbol: m^{2}.
 square mile

A unit of area defined as 640 acres and equivalent to 2.589988x10^{6} square meters.
Symbol: mi^{2}.
 square pes

A unit of area equivalent to 8.74126^{2} square meters.
 square Scottish ell

A unit of area equivalent to 8.8322x10^{1} square meters.
 square vara

A unit of area equivalent to 7.16883x10^{1} square meters.
 square yard

A unit of area defined as 1,296 square inches and equivalent to 8.361274x10^{1} square meters.
Symbol: yd^{2}.
 st

A symbol for the measurement unit stere.
 stack

A unit of volume equivalent to 108 cubic feet.
 stadian

A synonym for stadium.
 stadium

A unit of length defined as 606 feet and equivalent to 1.847088x10^{2} meters.
Synonym: stadion.
 standard

A unit of volume equivalent to 200 board feet.
 statute mile

A unit of length defined as 5280 feet and equivalent to 1.609344x10^{3} meters.
 stere

A unit of volume defined as exactly 1 cubic meter.
 strike

A unit of volume defined as exactly 8 pecks.
 T

(1) A symbol for the measurement unit prefix tera.
(2) A symbol for the measurement unit tesla, a unit of magnetic flux density.
 tablespoon

A unit of volume equivalent to 3 teaspoons and equivalent to 1.479x10^{5} cubic meters.
Symbol: Tbs.
 tank

A unit of volume equivalent to 400 imperial gallons.
 Tbs

A symbol for the measurement unit tablespoon.
 teaspoon

A unit of volume equivalent to 4.929x10^{6} cubic meters.
Symbol: tsp.
 tera

A measurement unit prefix equivalent to 10^{12}.
Symbol: T.
 thread

A unit of length defined as 54 inches and equivalent to 1.3716 meters.
 timber load

A unit of volume equivalent ot 50 cubic feet.
 tsp

A symbol for the measurement unit teaspoon.
 v

A symbol for velocity.
 vara

A unit of length equivalent to 33.333 inches and equivalent to 8.46658x10^{1} meters.
 velocity

A measurement unit derived from the base units length and time, and expressed as length divided by time.
Symbol: v.
 vol

A symbol for the class of measurement unit volume.
 volume

A class of measurement unit that is derived by multiplying three units of length.
Symbol: vol.
 week

A unit of time equivalent to 604800.0 seconds.
Symbol: wk.
 wey

A unit of volume equivalent to 40 British bushels.
 windle

A unit of volume equivalent to 3.5 bushels.
 wk

A symbol for week.
 wrap

A unit of length defined as 240 feet and equivalent to 7.3152x10^{1} meters.
 y

A symbol for the measurement unit prefix yocto.
 Y

A symbol for the measurement unit prefix yotta.
 yard

(1) A unit of length equivalent to 3 feet and defined as exactly 9.144x10^{1} meters.
(2) A unit of volume defined as 5 pints.
 yd

Symbol for the measurement unit yard.
 yd^{2}

Symbol for the measurement unit square yard.
 yd^{3}

A symbol for cubic yard.
 year

A unit of time defined as exactly 3.1536x10^{7} seconds.
Symbol: yr.
 yocto

A measurement unit prefix equivalent to 10^{24}.
Symbol: y.
 yotta

A measurement unit prefix equivalent to 10^{24}.
Symbol: Y.
 yr

A symbol for year.


