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Appliance Wattage Calculator
Household
Estimate daily and yearly electricity use and operating cost for a household appliance from wattage, or from amps and volts when wattage is not listed.
Carpet Calculator
Household
Calculate carpet coverage for rooms or straight stairs, with optional fixed-width broadloom planning, padding coverage, and material cost.
Paint Calculator
Household
Estimate the paint volume for one interior room's walls, a ceiling, a whole exterior, or a primer coat, then see a rounded container-size planning example. Confirm which sizes the coating you choose is actually sold in.
Solar Panel Calculator
Household
Estimate a home solar system size, panel count, roof area, annual generation, annual savings, installed cost, and simple payback period — or forecast yearly output from an existing array.
Wallpaper Calculator
Household
Estimate whole wallpaper rolls from wall size, physical roll dimensions, match type, pattern repeat, and trim allowance.
Water Hardness Calculator
Household
Enter any two of calcium, magnesium, and total hardness to solve the third. A total-hardness value by itself can also be converted and classified.