Smart Calculators for TVs, Screens, Gadgets, and Home Devices

TV Size Calculator

Estimate the best TV size for your room and seating distance.

TV Viewing Distance Calculator

Find a comfortable TV viewing distance based on screen size, aspect ratio, and field of view.

Projector Throw Distance Calculator

Calculate projector lens distance from screen size, aspect ratio, and throw ratio range.

Monitor PPI Calculator

Calculate monitor pixel density, pixel pitch, and perceived sharpness from screen size and resolution.

AC BTU Calculator

Estimate air conditioner cooling capacity from room size, ceiling height, sun, insulation, climate, people, and heat load.

Refrigerator Size Calculator

Estimate refrigerator capacity from household size, grocery habits, freezer needs, and kitchen width.

Washing Machine Capacity Calculator

Estimate washer capacity in kg, cu ft, and pounds from household size, laundry habits, bulky items, and laundry space.

Air Purifier CADR Calculator

Estimate the smoke CADR an air purifier needs from room dimensions, ceiling height, and target air changes per hour.

Dehumidifier Size Calculator

Estimate dehumidifier capacity in pints per day or liters per day from room size, dampness level, ceiling height, and space type.

Security Camera Storage Calculator

Estimate NVR, DVR, or microSD storage from camera count, bitrate, recording hours, retention days, installed capacity, and headroom.

Power Bank Flight Limit Calculator

Convert power bank mAh and voltage to watt-hours, then check common carry-on, airline-approval, and over-limit flight ranges.

CPAP Battery Runtime Calculator

Estimate how long a battery, UPS, or portable power station can run a CPAP machine from watt-hours, CPAP watts, sleep time, efficiency, and target nights.

AI Glasses Battery Life Calculator

Estimate AI smart glasses battery life from audio, video, photos, AI requests, live assist time, standby drain, and charging-case capacity.