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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.
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.
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.