More Useful Measurement Units

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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