TV, cable and backup power calculators

Cables, Wiring and Installer Documents

These pages cover the wiring side of a home AV or camera install: how long an HDMI or Ethernet run can be according to the published sources, how much power a given speaker wire gauge loses over a run, which series and parallel wiring options a subwoofer has and what impedance each presents, and whether a PoE switch’s power budget covers the devices you plan to connect. Figures come from the standards and guides named on each page; the equipment maker’s spec sheet always governs. Installers also get two document generators here: a quote with equipment, labor, tax and deposit totals, and an equipment list grouped by room. Prices and terms are yours; the pages only arrange and add up what you type, and nothing is stored or uploaded.

Tools in this group

  • Ethernet Cable Length Limit — Type the cable in the wall and your patch cords, then choose a speed and category. The page shows your channel against the 100 m figure and the reach the sources print.
  • HDMI Cable Length Limit — Pick your video format and cable type, then type your run. You get the lengths the named sources print for that cable, side by side, and how your run compares with each.
  • Home Theater Equipment List Generator — Type your items with quantity, cost, room and watts, and get a list grouped by room with totals and tick boxes for ordered, received and installed.
  • PoE Power Budget Calculator — List your devices with their watts or PoE class, type the switch's total PoE budget and a headroom you choose. You get the total, what is left and the port type each device needs.
  • Security Camera Installation Quote Generator — Type your equipment and labor lines, set tax, discount and deposit, and print or download an estimate sheet whose totals are exact to the cent.
  • Speaker Wire Gauge Chart — Choose your speaker impedance, the one-way run and a gauge. You get the cable resistance, the power lost and the dB loss, with every gauge side by side.
  • Subwoofer Wiring Diagram — Choose how many subwoofers you have, single or dual voice coils and the coil impedance. You get every series and parallel option with its exact load and a wiring diagram.