HomeGear Desk is a set of free calculators and references for people setting up or installing home audio-video and smart-home equipment. The TV pages give screen width and height for every common size, how to measure a TV, mounting height and viewing distance. The projector pages work out screen size and throw distance. The cable pages cover HDMI and Ethernet length limits, speaker wire gauge, subwoofer wiring and a PoE power budget. The power pages estimate UPS runtime, size and battery. Installers can lay out a quote and an equipment list. Results are estimates from the numbers you type and the formulas and sources named on each page; follow the equipment maker’s spec sheet and installation guide.
TV, Cable and Backup Power Calculators for Home AV
Pick a calculator for your TV or projector, your cables, your UPS or your install quote. Each page names its formulas and sources and runs in your browser.
Start here: TV Size Calculator
Diagonal, width, height and the largest TV that fits an opening