The power transmission via UTP cable calculation formula is a free tool that will allow you to determine the approximate Voltage drop / Running current / Voltage on camera site to expect with any given security camera run.
Use the calculator below to work out the maximum cable distance bases on your figures:
Power supply output voltage = V
Camera's request current = A
Camera's request voltage = V
Cable Impedance = Ohm/Meter  Ohm/Feet
Number of pairs in parallel = pair(s)
Minimum tolerable voltage at camera = V
 
Use the calculator below to work out the maximum using current bases on your figures:
Power supply output voltage = V
Camera's request voltage = V
Wire distance = Meters feet
Cable Impedance = Ohm/Meter  Ohm/Feet
Number of pairs in parallel = pair(s)
Minimum tolerable voltage at camera = V
 
Use the calculator below to work out the voltage of camera site bases on your figures:
Power supply output voltage = V
Camera's request current = A
Wire distance = Meters feet
Cable Impedance = Ohm/Meter  Ohm/Feet
Number of pairs in parallel = pair(s)
Minimum tolerable voltage at camera = V