Prefix

Symbol

Multiple

Scientific

exa

E

1000000000000000000

1.0E+18

peta

P

1000000000000000

1.0E+15

tera

T

1000000000000

1.0E+12

giga

G

1000000000

1.0E+09

mega

M

1000000

1.0E+06

kilo

k

1000

1.0E+03

hecto

h

100

1.0E+02

deca

da

10

1.0E+01

deci

d

0.1

1.0E-01

centi

c

0.01

1.0E-02

milli

m

0.001

1.0E-03

micro

u

0.000001

1.0E-06

nano

n

0.000000001

1.0E-09

pico

p

0.000000000001

1.0E-12

femto

f

0.000000000000001

1.0E-15

atto

a

0.000000000000000001

0.0E118

Length

angstrom

1.00E-10

metres

angstrom

0.1

nanometres

inch

25.4

millimetres

inch

2.54

centimetres

foot

0.3048

metres

foot

30.48

centimetres

yard

0.9144

metres

miles

1.6093

kilometres

miles

1609.3

metres

Area

square inch

645.16

square millimetres

square inch

6.4516

square centimetres

square foot

0.0929

square metres

Volume

cubic inch

16.39

millilitres

cubic inch

16.93

cubic centimetres

cubic foot

0.02832

cubic metres

cubic foot

28.32

Litres

cubic foot

6.23

Gallons

pint

0.5683

Litres

gallon

4.546

Litres

gallon

0.004546

cubic metres

Mass

grain

0.0648

grams

ounce (avoir)

28.35

grams

pounds (avoir)

0.4563

kilograms

hundredweight

50.8

kilograms

tons (UK)

1.016

tonne

tons (US)

0.9236

tonne

tons (UK)

1016

kilograms

Velocity

feet/second

0.3048

metres/second

miles/hour

0.447

metres/second

miles/hour

1.609

kilometres/hour

Flow rate

cubic feet / hour

0.2832

cubic metres / hour

cubic feet / hour

28.32

litres / hour

cubic feet / hour

7.866

millilitres / second

cubic feet / minute

0.0004719

cubic metres / second

gallons / hour

0.004546

cubic metres / hour

gallons / hour

4.546

Litres / hour

gallons / hour

1.263

millilitres / second

gallons / minute

0.07577

Litres / second

gallons / minute

4.546

Litres/minute

pounds/hour

0.4536

Kilograms/hour

pounds/hour

0.126

grams/second

FORCE

pounds - force

4.448

newtons

kilogram - force

9.807

newtons

MOMENT OF Force

(TORQUE)

pound -force feet

1.365

newton metres

9.807

Pressure Stress

inches w.g (4c)

2.491

millibars

millimetres w.g (4c)

0.09807

millibars

Inches Hg (0c)

33.86

millibars

millimetres Hg (0c)

1.333

millibars

torrs

1.333

millibars

Atmodsphere

1.01325

bars

pounds force/sq inch

0.06895

bars

pounds force/sq inch

68.95

millibars

tons force/sq inch

15.44

newtons/sq millimetre

tons force/sq inch

154.4

bars

kilograms force/sq mm

9.807

newtons/sq millimetre

dynes/sq centimetre

0.001

millibars

dynes/sq centimetre

0.1

newtons/sqmetre

dynes/sq centimetre

0.1

pascal

HEAT

Btu

1055

joules

1000 Btu

1.055

megajoules

therm

105.5

megajoules

calories

4.1868

joules

kilowatt hour

3.6

megajoules/hour

HEAT FLOW

Btu/hr

0.2931

watts

1000 Btu/hr

1.055

megajoules/hr

megajoules/hr

0.2778

kilowatts

kilowatts

3.6

megajoules/hr

REFRIGERATION

tons of refrigeration

3.517

kilowatts

tons of refrigeration

12.66

megajoules/hr

THERMAL CONDUCTANCE

Btu/sq foot hour F

5.678

watts/sq metre C

POWER

Horsepower

0.7457

kilowatts

FREQUENCY

cycles/second

1

hertz

Temperature

degree F

5/9

degree C

degree F

5/9

kelvins

Temperature Conversions

To convert F to C

C=(5/9)(F-32)

To convert F to K

K=(5/9)(F+459.67)

To convert C to K

K=(C+273.15)