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The following chart contains commonly used conversions of length, area, and volume. Simply multiply what you want to convert by the number in the last column.

inch | to | millimeters | X 25.4 |

inch | to | centimeters | X 2.54 |

inch | to | meters | X .0254 |

inch | to | feet | X .0833 |

millimeters | to | centimeters | X .100 |

millimeters | to | feet | X .00328 |

millimeters | to | inch | X .03937 |

millimeters | to | meters | X .00100 |

centimeters | to | millimeters | X 10.0 |

centimeters | to | feet | X .0328 |

centimeters | to | inch | X .3937 |

centimeters | to | meters | X .0100 |

feet | to | centimeters | X 30.48 |

feet | to | inch | X 12.0 |

feet | to | meters | X .3048 |

feet | to | millimeters | X 304.8 |

meters | to | centimeters | X 100 |

meters | to | inch | X 39.37 |

meters | to | feet | X 3.28 |

meters | to | millimeters | X 1000 |

inch^{2} |
to | centimeters^{2} |
X 6.452 |

inch^{2} |
to | feet^{2} |
X .006944 |

inch^{2} |
to | millimeter^{2} |
X 645.2 |

inch^{2} |
to | meter^{2} |
X .0006452 |

centimeter^{2} |
to | inch^{2} |
X .1550 |

centimeter^{2} |
to | feet^{2} |
X .001076 |

centimeter^{2} |
to | millimeter^{2} |
X 100 |

centimeter^{2} |
to | meter^{2} |
X .0001 |

millimeter^{2} |
to | inch^{2} |
X .001550 |

millimeter^{2} |
to | centimeters^{2} |
X .0100 |

millimeter^{2} |
to | feet^{2} |
X .00001076 |

millimeter^{2} |
to | meter^{2} |
X .000001 |

meter^{2} |
to | inch^{2} |
X 1550 |

meter^{2} |
to | centimeters^{2} |
X 10000 |

meter^{2} |
to | feet^{2} |
X 10.76 |

meter^{2} |
to | millimeter^{2} |
X 1000000 |

feet^{2} |
to | millimeter^{2} |
X .000929 |

feet^{2} |
to | centimeter^{2} |
X 929.0 |

feet^{2} |
to | inch^{2} |
X 144.0 |

feet^{2} |
to | meter^{2} |
X .0929 |

inch^{3} |
to | feet^{3} |
X .0005787 |

inch^{3} |
to | centimeters^{3} |
X 16.39 |

inch^{3} |
to | meters^{3} |
X .00001639 |

inch^{3} |
to | liters | X .01639 |

feet^{3} |
to | centimeters^{3} |
X 28320 |

feet^{3} |
to | inch^{3} |
X 1728 |

feet^{3} |
to | meters^{3} |
X .02832 |

feet^{3} |
to | liters | X 28.32 |

centiimeters^{3} |
to | inch^{3} |
X .06102 |

centiimeters^{3} |
to | feet^{3} |
X .00003531 |

centiimeters^{3} |
to | meters^{3} |
X .000001 |

centiimeters^{3} |
to | liters | X .001 |

liters | to | centimeters^{3} |
X 1000 |

liters | to | inch^{3} |
X 61.02 |

liters | to | feet^{3} |
X .03531 |

liters | to | meters^{3} |
X .001 |

In many electrical circuits, the values of components are specified in units with prefixes. This makes the numbers easier to handle without long strings of zeros.

mega = X 10^{6}

kilo = X 10^{3}

milli = X 10^{-3}

micro = X 10^{-6}

nano = X 10^{-9}

pico = X 10^{-12}

E = Potential Difference (volts)

I = Current (amperes)

R = Resistance (ohms)

P = Power (watts)

**Power (watts)**

E X I

I^{2} X R

E^{2} / R

**Potential Difference (volts)**

I X R

SQRT( P X R )

P / I

**Current (amperes)**

E / R

P / E

SQRT ( P / R )

**Resistance (ohms)**

E / I

E^{2} / P

P / I^{2}

**Resistances in series**

RT = R1 + R2 + R3 .... + Rn

**Resistances in parallel**

1/RT = 1/R1 + 1/R2 + 1/R3... + 1/Rn

**Resistances in parallel (2 components)**

RT = (R1 X R2) / (R1 + R2)

**Capacitances in series**

1/CT = 1/C1 + 1/C2 + 1/C3... + 1/Cn

**Capacitances in parallel**

CT = C1 + C2 + C3 .... + Cn

**6dB High Pass**

Series Cap = .159 / ( Impedance X Frequency )

**6dB Low Pass**

Series Inductor = Impedance / (6.28 X Frequency )

**12dB Butterworth (high and low pass)**

Capacitor = .1125 / ( Impedance X Frequency )

Inductor = ( .2251 X Impedance ) / Frequency

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