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"Direct Low Voltage Supply has helped me save tons of money thru out the years. Thanks!"
  – Bill Brasky
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Online Tools

The calculators below are powerful tools for getting the precise information you need. Simply choose the appropriate calculator and enter your data. It’s just that easy.

Voltage Calculator

Calculate Amps, Watts or Volts required to properly power a system
The Voltage Calculator is used to determine power source requirements. Knowing these values allows the proper selection of power supply to meet the power requirements of a device. This is also valuable when a new device is being added to an existing power supply.


Field of View Calculator

Calculate Lens millimeter selection according to area size
The Field of View Calculator (or FOV) is used to help predetermine proper lens selection prior to installation. This Calculator will help with a preview to area size that is visible through the lens with entered values.


Wire Gauge Calculator

Calculate wire gauge size for proper powering of equipment according to distance of power supply to powered device
Used as a guideline to determine the necessary wire gauge and maximum cable distance for 24vac. This calculator is for 24 volt equipment only.