11 free tools
Home calculators
Plan paint, energy, water, appliance, and home improvement needs. Every tool includes its formula, an example, and instant private results.
Electricity Cost Calculator
Estimate an appliance’s electricity use and cost from wattage, run time, and utility rate.
Open calculatorPaint Calculator
Estimate wall area and gallons of paint needed from room dimensions, coats, and coverage.
Open calculatorWallpaper Calculator
Estimate wallpaper rolls from wall area, roll size, and pattern repeat.
Open calculatorAC BTU Calculator
Size air conditioning BTU needs from room size and sun exposure.
Open calculatorAppliance Energy Calculator
Estimate monthly electricity cost for any appliance usage pattern.
Open calculatorWater Usage Calculator
Estimate household water use from fixtures, people, and habits.
Open calculatorPool Volume Calculator
Estimate pool gallons from shape, length, width, and depth.
Open calculatorHot Tub Volume Calculator
Estimate hot tub water volume for chemical dosing and heating.
Open calculatorPressure Washer Calculator
Estimate cleaning time and water use for surface area jobs.
Open calculatorRefrigerator Size Calculator
Find recommended fridge capacity from household size and habits.
Open calculatorTV Size Calculator
Choose TV screen size from viewing distance and room layout.
Open calculatorAbout our home calculators
CalculatorDepot tools are designed for quick estimates and learning. Inputs stay in your browser, and each page describes the equation behind its result. Check important decisions with a qualified professional when individual circumstances, regulations, or fees matter.