More Useful Measurement Units

The E indicates an exponent, as in scientific notation, followed by a positive or negative number, representing the power of 10 by which the given conversion factor is to be multiplied before use.


Factors for Conversion to SI Units of Measurement


To convert from
To
Multiply by

Acre

 Square meter, m2 4.046873 E + 03
Angstrom, Å Meter, m 1.000000*

E – 10
Atmosphere, atm (standard)

Pascal, Pa

 1.013250* E + 05
Atmosphere, atm

(technical = 1kgf/cm2 )

 Pascal, Pa 9.806650* E + 04
Bar Pascal, Pa 1.000000* E + 05
Barrel (for petroleum, 42 gal) Cubic meter, m2 1.589873 E – 01
Board foot, board ft Cubic meter, m3

2.359737

 E – 03

British thermal unit, Btu (mean)

 Joule, J 1.05587 E + 03
British thermal unit, Btu ( International Table) – in /
(h) (ft2) (0F)(k, thermal conductivity) 		Watt per meter Kelvin, W / (m-K) 1.442279

E – 01
British thermal unit, Btu ( International Table)/h

Watt, W

 2.930711 E – 01
British thermal unit, Btu (International Table)/(h)(ft2)(0F)(C,
thermal conductance) 		Watt per square meter Kelvin, W/m2-K) 5.678263

E + 00
British thermal unit, Btu ( International Table) / lb

Joule per kilogram, J/kg

 2.326000* E + 03
British thermal unit, Btu (International Table)/(lb)(0F)
(c,heat capacity)

Joule per kilogram Kelvin, J/(kg-K)

 4.186800* E + 03
British thermal unit, cubic foot, Btu (International
Table)/ft3 		Joule per cubic meter, J/m3 3.725898 E + 04
bushel (U.S.)
 		cubic meter, m3

3.523907
 		E - 02
calorie (mean)
 		joule, J
 		4.19002
 		E + 00
candela per square

inch, cd/in 2

 candela per square

meter, cd/m2

 1.550003
 		E + 03
centimeter, cm, of

mercury (0°C)

pascal, Pa
 		1.33322
 		E + 03
centimeter, cm, of

water (4°C)

 pascal, Pa
 		9.80638
 		E + 01
chain

meter, m

2.011684

E + 01

circular mil
 		square meter, m2

5.067075
 		E - 10
day
 		second, s
 		8.640000*

E + 04
day (sidereal)

second, s

8.616409

E + 04

degree (angle)
 		radian, rad
 		1.745329
 		E - 02

(°F)(h)(ft
2)/Btu

(International
Table) (R, thermal

resistance)

 kelvin square

meter per watt,

K-m2

 1.761102
 		E - 01

dyne, dyn

newton, N

1.000000*

E - 05
fathom
 		meter, m
 		1.828804
 		E + 00
foot, ft
 		meter, m
 		3.048000*
 		E - 01

foot, ft (U.S.
survey)

meter, m

3.048006

E - 01
foot, ft, of water

(39.2°F) (pressure)

 pascal, Pa
 		2.98898
 		E + 03
square foot, ft2
 		square meter, m2
 		9.290304*
 		E - 02

square foot per
hour,

ft
2
/h (thermal

diffusivity)

square meter per

second, m2/s

 2.580640*
 		E - 05

square foot per

second, ft
2
/s

square meter per

second, m
2
/s

9.290304*
 		E - 02
cubic foot, ft
3
(volume

or section modulus)

cubic meter, m
3

2.831685
 		E - 02
cubic foot per
minute,

ft3
/min

 cubic meter per

4.719474

E - 04
cubic foot per
second,

ft3
/s

cubic meter per

second, m3
/s

2.831685
 		E - 02
foot to the fourth

power, ft
4 (area

moment of inertia)

meter to the fourth

power, m4

8.630975
 		E - 03
foot per minute,

ft/min

meter per second,

m/s

5.080000
*
 		E - 03
foot per second,

ft/s

meter per second,

m/s

 3.048000*
 		E - 01
foot per second

squared, ft/s2

meter per second

squared, m/s2

3.048000*
 		E - 01
footcandle, fc
 		lux, lx
 		1.076391
 		E + 01
footlambert, fL
 		candela per square

meter, cd/m2

3.426259
 		E + 00
foot pound force,
ft-lbf

joule, J

1.355818

E + 00

foot pound force
per

minute, ft-lbf/min

watt,W
 		2.259697
 		E - 02
foot pound force
per

second, ft-lbf/s

watt,W
 		1.355818

E + 00

foot poundal, ft

poundal

joule, J
 		4.214011 E - 02

free fall, standard
g

meter per second

squared, m/s2

9.806650*
 		E + 00
gallon, gal
(Canadian

liquid)

cubic meter, m3
 		4.546090
 		E - 03
gallon, gal (U.K.

liquid)

cubic meter, m3
 		4.546092
 		E - 03
gallon, gal (U.S.
dry) 		cubic meter, m
3
 		4.404884
 		E - 03
gallon, gal (U.S.

liquid)

cubic meter, m3
 		3.785412
 		E - 03
gallon, gal (U.S.

liquid) per day

cubic meter per

second, m3
/s

4.381264

E - 08
gallon, gal (U.S.

liquid) per minute

cubic meter per

second, m3
/s

6.309020

E - 05
grad

degree (angular)

9.000000*
 		E - 01
grad
 		radian, rad
 		1.570796
 		E - 02
grain, gr
 		kilogram, kg
 		6.479891*
 		E - 05
grain, g

kilogram, kg

1.000000*
 		E - 03
hectare, ha
 		square meter, m2
 		1.000000*
 		E + 04
horsepower, hp
 		watt,W
 		7.456999
 		E + 02
horsepower, hp

(boiler)

watt,W
 		9.80950
 		E + 03
horsepower, hp

(electric)

watt,W
 		7.460000*
 		E + 02
horsepower, hp

(water)

watt,W
 		7.46043*
 		E + 02
horsepower, hp
(U.K.) 		watt,W
 		7.4570
 		E + 02
hour, h
 		second, s
 		3.600000*
 		E + 03
hour, h (sidereal)
 		second, s
 		3.590170
 		E + 03
inch, in
 		meter, m
 		2.540000*
 		E - 02
inch of mercury, in
Hg

(32°F) (pressure)

pascal, Pa
 		3.38638
 		E + 03
inch of mercury, in
Hg

(60°F) (pressure)

pascal, Pa
 		3.37685
 		E + 03

inch of water, in

H
2
O (60°F)

(pressure)

pascal, Pa

2.4884

E + 02

square inch, in
2
 		square meter, m2
 		6.451600*
 		E - 04
cubic inch, in
3

(volume or section

modulus)

cubic meter, m3

1.638706
 		E - 05
inch to the fourth

power, in4 (area

moment of inertia)

meter to the fourth

power, m4

4.162314
 		E - 07
inch per second,
in/s 		meter per second,

m/s

2.540000*

E - 02
kilogram force, kgf
 		newton, N
 		9.806650*
 		E + 00
kilogram force
meter,

kg-m

newton meter,

N-m

9.806650*
 		E + 00
kilogram force
second

squared per meter,

kgf-s
2
/m (mass)

kilogram, kg
 		9.806650*
 		E + 00

kilogram force per

square centimeter,

kgf/cm
2

pascal, Pa
 		9.806650*
 		E + 04
kilogram force per

square meter,

kgf/m
2

pascal, Pa
 		9.806650*
 		E + 00
kilogram force per

square millimeter,

kgf/mm
2

pascal, Pa

9.806650*
 		E + 06
kilometer per hour,

km/h

meter per second,

m/s

2.777778
 		E - 01
kilowatt hour, kWh
 		joule, J
 		3.600000*
 		E + 06
kip (1000 lbf)
 		newton, N
 		4.448222
 		E + 03
knot, kn
(international)

meter per second,

m/s

5.144444
 		E - 01

lambert, L

candela per square

meter, cd/m

3.183099
 		E + 03
liter

cubic meter, m3

1.000000*
 		E - 03
maxwell
 		weber, Wb
 		1.000000*
 		E - 08
mho
 		siemens, S
 		1.000000*
 		E + 00
microinch,
 		meter, m
 		2.540000*
 		E - 08

micron,

 meter, m
 		1.000000*
 		E - 06
mil, mi

meter, m

2.540000*
 		E - 05
mile, mi
(international) 		meter, m
 		1.609344*
 		E + 03
mile, mi (U.S.
statute) 		meter, m
 		1.609347
 		E + 03
mile, mi
(international

nautical)

meter, m

1.852000*
 		E + 03
mile, mi (U.S.
nautical) 		meter, m
 		1.852000*
 		E + 03
square mile, mi2

(international)

square meter, m2
 		2.589988

E + 06

square mile, mi2

(U.S. statute)

square meter, m2
 		2.589998
 		E + 06
mile per hour, mi/h

(international)

meter per second,

m/s

4.470400*
 		E - 01
mile per hour, mi/h

(international)

 kilometer per hour,

km/h

1.609344*
 		E + 00
millibar, mbar
 		pascal, Pa
 		1.000000*
 		E + 02
millimeter of
mercury,

mmHg (0°C)

 pascal, Pa
 		1.33322
 		E + 02
minute (angle)

radian, rad

2.908882

E - 04

minute, min
 		second, s
 		6.000000*
 		E + 01
minute (sidereal)

second, s

 5.983617
 		E + 01
ounce, oz

(avoirdupois)

kilogram, kg

2.834952
 		E - 02

ounce, oz (troy or

apothecary)

kilogram, kg

3.110348

E - 02

ounce, oz (U.K.
fluid) 		cubic meter, m3
 		2.841307
 		E - 05
ounce, oz (U.S.
fluid) 		cubic meter, m3
 		2.957353
 		E - 05
ounce force, ozf

newton, N

2.780139

E - 01

ounce force_inch,

ozf-in

newton meter,

N-m

7.061552

E - 03
ounce per square
foot,

oz (avoirdupois)/ft2

kilogram per square

meter, kg/m2

3.051517
 		E - 01

ounce per square
yard,

oz (avoirdupois)/yd2

kilogram per square

meter, kg/m2

3.390575
 		E - 02
perm (0°C)

kilogram per pascal

second meter,

kg/(Pa-s-m)

5.72135
 		E - 11
perm (23°C)
 		kilogram per pascal

second meter,

kg/(Pa-s-m)

 5.74525
 		E - 11
perm inch, perm-in

(0°C)

kilogram per pascal

second meter,

kg/(Pa-s-m)

1.45322

E - 12
perm inch, perm-in

(23°C)

kilogram per pascal

second meter,

kg/(Pa-s-m)

 1.45929
 		E - 12

pint, pt (U.S. dry)

cubic meter, m3
 		5.506105
 		E - 04
pint, pt (U.S.
liquid) 		cubic meter, m3
 		4.731765
 		E - 04
poise, p (absolute

viscosity)

pascal second,

Pa-s

1.000000*
 		E - 01
pound per foot-

second, lb/ft-s

pascal second,

Pa-s

1.488164

E + 00

pound per square

foot, lb/ft2

kilogram per square

meter, kg/m2

4.882428
 		E + 00
pound per cubic

foot, lb/ft3

kilogram per cubic

meter, kg/m3

1.601846
 		E - 01
pound per gallon,

lb/gal (U.K.
liquid)

kilogram per cubic

meter, kg/m3

9.977633

E + 01

pound per gallon,

lb/gal (U.S.
liquid)

kilogram per cubic

meter, kg/m3

1.198264

E + 02
pound per hour,
lb/h 		kilogram per

second, kg/s

1.259979

E - 04

pound per cubic
inch,

lb/in3

kilogram per cubic

meter, kg/m
3

2.767990

E + 04
pound per minute,

lb/min

kilogram per

second, kg/s

 7.559873

E - 03

pound per second,

lb/s

kilogram per

second, kg/s

 4.535924
 		E - 01
pound per cubic
yard,

lb/yd3

kilogram per cubic

meter, kg/m3

5.932764
 		E - 01

poundal

newton, N

1.382550

E - 01
pound_force, lbf
 		newton, N
 		4.448222
 		E + 00
pound force foot,

lbf_ft

newton meter,

N-m

1.355818
 		E + 00
pound force per
foot,

lbf/ft

newton per meter,
N/m 		1.459390
 		E + 01
pound force per

square foot, lbf/ft2

pascal, Pa
 		4.788026
 		E + 01
pound force per
inch,

lbf/in

newton per meter,

N/m

1.751268
 		E + 02
pound force per
square

inch, lbf/in2
(psi)

pascal, Pa
 		6.894757
 		E + 03
quart, qt (U.S.
dry)

cubic meter, m3

1.101221
 		E - 03
quart, qt (U.S.
liquid) 		cubic meter, m3
 		9.463529
 		E - 04
rod
 		meter, m
 		5.029210
 		E + 00
second (angle)
 		radian, rad
 		4.848137
 		E - 06
second (sidereal)
 		second, s
 		9.972696
 		E - 01
square (100 ft2
) 		square meter, m2
 		9.290304*
 		E + 00
ton (assay)
 		kilogram, kg
 		2.916667
 		E - 02
ton (long, 2240 lb)

kilogram, kg

1.016047

E + 03

ton (metric)
 		kilogram, kg
 		1.000000*
 		E + 03
ton (refrigeration)
 		watt,W
 		3.516800
 		E + 03
ton (register)
 		cubic meter, m3
 		2.831685
 		E + 00
ton (short, 2000
lb) 		kilogram, kg
 		9.071847
 		E + 02
ton (long per cubic

yard, ton)/yd3

kilogram per cubic

meter, kg/m3

1.328939

E + 03

ton (short per
cubic

yard, ton)/yd3

kilogram per cubic

meter, kg/m3

1.186553

E + 03
ton force (2000
lbf) 		newton, N
 		8.896444
 		E + 03
tonne, t

kilogram, kg

1.000000*
 		E + 03
watt hour, Wh joule, J
 		3.600000*
 		E + 03
yard, yd
 		meter, m
 		9.144000*
 		E - 01
square yard, yd2

square meter, m2

8.361274
 		E - 01
cubic yard, yd3
 		cubic meter, m3
 		7.645549
 		E - 01
year (365 days)
 		second, s
 		3.153600*
 		E + 07

year (sidereal)

second, s


3.155815

E + 07

* Exact value.

From E380, “Standard for Metric Practice,” American Society for Testing

Posted by SRIDHARAN VARATHARAJ

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