Voltage Drop Calculator

The voltage drop calculator can help determine proper wire size for the power wire based on voltage drop and current carrying capacity.

1. Supplied Voltage

Camera voltage. Choose if your system operates on 12 V or 24 V

2. AC / DC

Select AC or DC. Choose the voltage type your camera operates.

3. Current (Amps)

Cameras Current use in amps.enter voltage as a decimal, 680mA = 0.680

4. Cable Length (ft)

Enter the length of your cable in feet

5. Cable Gauge (AWG)

Enter the size of your cable. CCTV standard is 18 awg



Note: Industry standard is a voltage drop of no greater than 10%.
1.2 volts (minimum operating voltage of 10.8v DC) for 12v DC power.
2.4 volts (minimum operating voltage of 21.6v AC) for 24v AC Power

If a longer run is needed for 12v DC try our AC to DC Converter    Converter

Power Cable Distance Quick Guide

NOTE: 18AGW is industry standard CCTV power cable

Power Cable Size

12v DC 18 AGW 16 AGW
Amperage Maximum Distance Maximum Distance
100 mA 941 ft 1506 ft
200 mA 470 ft 753 ft
300 mA 313 ft 502 ft
400 mA 235 ft 376 ft
500 mA 188 ft 301 ft
700mA 134 ft 215 ft
1000 mA 94 ft 150 ft
24v AC 18 AGW 16 AGW
Amperage Maximum Distance Maximum Distance
100 mA 1878 ft 3006 ft
200 mA 939 ft 1503 ft
300 mA 626 ft 1002 ft
400 mA 469 ft 751 ft
500 mA 375 ft 601 ft
700mA 268 ft 429 ft
1000 mA 187 ft 300 ft

CCTV Camera Lens Calculator

The function of the camera lens is to collect light reflected from the scene and focus it into an image onto the CCTV camera sensor. Most CCTV applications use a fixed-focal-length lens, which, like your eye’s lens, covers a constant angular field of view. That is, the fixed lens images a scene with constant magnification. A large variety of CCTV camera lenses are available with different focal lengths, which will provide different fields of view. Wide-angle, medium-angle, or narrow-angle lenses produce different magnifications and fields of view.

This handy field of view calculator will help you in determining which lens is right for your application. Simply enter the distance to the object, camera format, and focal length of the lens. Click “Calculate” to see the field of view you can expect with that lens. It also works in reverse. If you know the field of view you need, enter it in and the distance to the object along with camera format to find the focal length you will need to get the field of view desired.

CCD Image Sensor size
1/4" 1/3" 1/2" 2/3"   1"

Distance to Object: ft
Please fill in two of the three rows.

(Field of View fill in either height or width)
Focal Length mm
Field of view (H x V):  ft   x     ft 


Distance to Object: ft
Focal Length mm
Field of view (H x V):
 ft   x     ft