Conversions

General

Pi=π =3.14
3.14/4=0.785
The area of a circle can be found by using the formula "π*radius²" or by the formula "diameter²*0.785"

1.732 is a number used often in three phase calculations.
The square root of 3 is 1.732.

1.41 is the constant multiplier when determining 45º distance runs from right angle(90º).
For a right angle triangle: A²+B²=C², (Opposite side²=Adjacent side²=Hypotenuse²).
The square root of 2 is 1.41.

Power & Energy

Btu per hour*0.293=Watts
Kilowatts*1.341=Horsepower
Kilowatt-hour*3412.14=Btu
Horsepower*746=Watts
Horsepower*550=Foot-pounds per second
Horsepower*33000=Foot-pounds per minute
Horsepower*42.4072=Btu per minute
Watts*0.00134=Horsepower
Watts*44.2537=Foot-pound force per minute
Watts*0.0568=Btu per minute
Watts*3.412=Btu per hour
Watt second*1=Joule

Electrical Conductor Equations

1 Mil=0.001 inches
1 Circular Mil=0.7854 Square Mil
1.27 Circular Mils=1 Square Mil
Circular Mil of a BUS bar=(Mils Width*Mils Thickness)/0.7854
Circular Mil of a ROUND conductor=(Diameter in Mils)²
Mils to Metric: 39.37 Mils=1 Millimeter
Mils to Metric: 1550 Circular Mils=1 Circular Millimeter
Mils to Metric: 1974 Circular Mils=1 Square Millimeter

Metric System Basics

Micro=0.000001
Milli=0.001
Centi=0.01
Deci=0.1
Deka=10
Hecto=100
Kilo=1,000
Mega=1,000,000

Temperature

Fº=Degrees Fahrenheit
C°= Degrees Centigrade
Degrees Fahrenheit=32+(9/5*C°)
Degress Centigrade=5/9*(F°-32)

Metric System Conversions

1 Inch=2.54 Centimeters
1 Centimeter=0.3937 Inches
1 Inch=25.4 Millimetes
1 Millimeter=0.03937 Inches
1 Foot=0.3048 Meter
1 Meter=3.281 Feet
1 Yard=0.9144 Meters
1 Meter=1.094 Yards
1 Mile=1.609 Kilometers
1 Kilometer=0.6214 Miles