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Units Calculator
Units From/To To/From SI Units Prefixes
Imperial-UK Measurement Units

Units of Length

1 mil or thou - 0.001 in. = 0.0254mm
1 inch in., "
= 25.4mm = 0.0254m
1 hand - 4.0ins. = 10.16cm = 0.1016m
1 span - 9.0ins. = 22.86cm = 0.2286m
1 foot ft., ' 12.0ins. = 30.48cm = 0.3048m
1 yard yd. 3.0ft. = 91.44cm = 0.9144m
1 rod rd. 1.0p. = 5.0292m
1 perch, pole p. 1.0rd. = 5.0292m
1 chain ch. 4.0rd. = 20.1169m
1 mile (statute) mi., m.
= 1609.344m = 1.609 km
1 mile (nautical) mi., m.
= 1852m = 1.852 km
 
Units of Area

1 square inch sq.in.
= 6.4516cm2= 6.4516.10-4m2
1 square foot sq.ft. 144.0sq.ins. = 0.092903m2
1 square yard sq.yd. 9.0sq.ft. = 0.8361m2
1 square - 100.0sq.ft. = 9.29m2
1 square rod sq.rd.
= 25.293m2
1 rood ro. 40.0sq.rds. = 1011.71m2
1 acre A., a. 4.0ro. = 4046m2
1 square mile sq.mi.
= 2.5899.106m2= 2.5899km2
 
Units of Volume

1 cubic inch cu.in.
= 16.387cm3= 16.3871.10-6m3
1 cubic foot cu.ft.
= 0.02832m3
1 cubic yard cu.yd.
= 0.7646m3
1 shipping ton - 40.0 cu.ft. = 1.13m3
1 register ton reg.tn. 100.0cu.ft. = 2.832m3
 
Units of Capacity

1 UK fluid ounce fl.oz.
= 0.0284l= 28.4130.10-6m3
1 US fluid ounce US fl.oz.
= 0.02957l= 29.5737.10-6m3
1 UK dry pint dry.pt.
= 0.473l= 473.179.10-6m3
1 US dry pint US dry.pt.
= 0.55l= 550.614.10-6m3
1 UK liquid pint liq.pt. 1/8gal. = 0.568l= 568.261.10-6m3
1 US liquid pint US liq.pt. 1/8 US gal. = 0.473l= 473.179.10-6m3
1 UK quart qt. 2 liq.pts. = 1.136l= 1.136.10-3m3
1 US quart US qt. 2 US liq.pts. = 0.94633.10-3m3
1 UK gallon gal. 4 qts. = 4.54609l= 4.54609.10-3m3
1 US gallon US gal. 4 US qts. = 3.78543l= 3.78543.10-3m3
1 UK bushel bu., bsh.
= 36.3687l= 36.3687.10-3m3
1 US bushel US bu., bsh.
= 35.2393l= 35.2393.10-3m3
1 UK barrel
36gal. = 163.65l = 163.65.10-3m3
1 US petroleum barrel
42 US gal. = 158.988l = 158.988.10-3m3
1 US dry barrel
105 US qts. = 115.628l = 115.628.10-3m3
 
Units of Mass

I. Trade Units (avoirdupois)

1 grain gr.
= 64.7989.10-6kg
1 drachm, am. dram dr.(av.)
= 1.7718.10-3kg
1 ounce oz.(av.) 16drs. = 28.3495.10-3kg
1 pound lb.(av.) 16oz. = 0.45359kg
1 stone st. 14lbs. = 6.350kg
1 quarter qr. 28lbs. = 12.7kg
1 US quarter US qr. 25lbs. = 11.34kg
1 hundredweight (long) cwt.l. 112.0lbs. or 4.0qrs. = 50.8023kg
1 hundredweight (short) am. cwt.sh. 100.0lbs. = 45.3592kg
1 ton (long) tn.l. 2240.0lbs. = 1016.05kg
1 ton (short)am. tn.sh. 2000.0lbs. or 20.0cwt.sh. = 907.185kg
1 slug - 1.0lb.sec2/ft. = 14.5939kg

II. Troy and Apothecaries Units

1 grain gr.
= 64.7989.10-6kg
1 scruple s. ap. 20.0grs.
= 1.2960.10-3kg
1 pennyweight dwt. (t.) 24.0grs.
= 1.555.10-3kg
1 drachm, am. dram dr. ap. 3.0s. ap.
= 3.887.10-3kg
1 ounce oz. ap. 8.0drs.
= 31.1035.10-3kg

oz. t. 20.0dwt.
= 31.1035.10-3kg
 
Units of Frequency

1 cps., c/s

= 1 Hz
1 rps.

= 1 Hz
1 rpm

= 1/60 Hz
1 kc/s

= 1.103 Hz
 
Units of Linear Velocity

1 in/sec., ips.

= 25.4.10-3m/s
1 ft/sec., fps.

= 0.3048 m/s
1 yd/sec.

= 0.9144m/s
1 mi/hr., mph.

= 0.44704m/s = 1.6093km/h
1 knot, kn

= 0.5144m/s
1 n. mile/hr

= 0.5144m/s
 
Units of Linear Acceleration

1 in/sec2

= 25.4.10-3m/s2
1 ft/sec2

= 0.3048m/s2
1 yd/sec2

= 0.9144m/s2
 
Units of Mass of Unit Length

1 oz/ft.

= 93.0104.10-3kg/m
1 lb/ft.

= 1.4882kg/m
1 lb/yd.

= 0.4961kg/m
 
Units of Density

1 lb/cu.ft.

= 16.0185kg/m3
1 lb/cu.in.

= 27680kg/m3=27.68Mg/m3
1 oz/cu.ft.

= 1.0011kg/m3
 
Units of Specific Volume

1 cu.ft./lb.

= 0.06243m3/kg
1 cu.ft./oz.

= 0.9988m3/kg
1 cu.in./lb.

= 36.127.10-6m3/kg
1 gal/lb.

= 10.0221.10-3m3/kg
 
Units of Mass Flow

1 oz/sec.

= 28.3.10-3kg/s
1 lb/hr.

= 126.10-6kg/s
 
Units of Volume Flow

1 cu.in./sec.

= 16.4.10-6m3/s
1 cu.ft./sec.

= 28.3.10-3m3/s
1 cu.yd./sec.

= 0.765m3/s
1 US gal/sec.

= 3.785.10-3m3/s
1 US gal/min.

= 63.09.10-6m3/s
1 US gal/hr.

= 1.0515.10-6m3/s


 
Units of Pressure and Mechanical Tension

1 lb/sq.in., pis.

= 6894.76 Pa = 6.895 kPa
1 ton/sq.in.

= 15.4443 MPa
1 lb/sq.ft.

= 47.8803 Pa
1 pdl/sq.ft.

= 1.4882 Pa
1 ft. H2O

= 2989.07 Pa = 2.989 kPa
1 in. H2O

= 249.089 Pa
1 in. Hg

= 3386.39 Pa = 3.386 kPa


Abbreviations


A;a
AA
AAA
AAI
AAO
AAODC
AAPA
AAPG
AAScW
Ab.
abb.; abbr.; abbrev
ABCC
abd.
ABR
Abr. ;abr.
ABS
abs.
abut.
AC 
Ac.
ac. 
a/c
Ac.a.
acc. 
1. area; 2. acre; 3. air cource; 4. azimuth
1. Arithmetical average; 2. Ascorbin acid; 3. Anti-aircraft
Acetoacetanilide
Asphalt ageing index
Ascorbic acid Oxidase
American Association of Oilwell Drilling Contractors
Applicant's admitted prior art
American Association of Petroleum Geologists
American Association of Scientific Workers
Air break
1. Abbreviation; 2. Abbreviated
Association of British Chambers of Commerce
Abandoned
Acryl butadiene rubber 
1. abridgement; 2.abridged
Acryl nitrile-butadiene-styrene
absolute
abutment
1. alternating current; 2. aiming circle; 3. analogue computer; 4. analytical chemist 
1. acetyl; 2. acyl; 3. acceptance number
1. acid; 2. alicyclic 
account current
acetic acid
1. acceleration; 2. according to; 3. accident