Free home calculators
Quick answers that depend on your house and where it is: your climate zone, your attic, your electricity rate. No sign-up, and every number shows where it came from.
Energy and heating
Attic insulation calculator
Your climate zone's ENERGY STAR level, the inches to add, how many bags to buy and what a pro would charge.
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Space heater cost calculator
Cost per hour, day and month for a space heater or any plug-in appliance, at your state's electricity rate.
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Solar payback calculator
Payback years and 25-year savings, with your state's electricity rate and sunshine.
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Buying and owning
Mortgage payment calculator
Monthly payment with taxes, insurance and PMI, and your state's property tax rate filled in.
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Refinance break-even calculator
How many months until a lower rate pays back the closing costs.
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Home insurance cost calculator
Your state's average premium, scaled by coverage, deductible, roof age and bundling.
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Repairs
More ways to plan the year
The seasonal checklists by state list the jobs that matter where you live, on one printable page, and Know Your Home explains the systems behind them. To get reminded when each job is due, build your free seasonal plan in about a minute.