Calculators that show their work
Every tool uses documented formulas, clear units and stated assumptions. Bring the numbers from your own bill.
Ready to use
Electricity Cost Calculator
Estimate a monthly electric bill from your usage, rate and fixed charges, or price out a single appliance.
Open the calculatorAppliance Electricity Cost
What one appliance costs to run per day, month and year.
Open the calculator Compare two electricity plansYour usage, two offers: monthly and yearly cost plus the break-even point.Compare plans →Coming next
Every new calculator gets the same treatment: documented formulas, clear units and no made-up rates.
Electricity
Air Conditioner Operating Cost
Estimate cooling costs from size, efficiency and hours of use.
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EV Charging Cost
Home charging cost per mile and per month.
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Solar Payback Estimator
Simple payback from system cost, production and your rate.
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Heating & Cooling
Heating Cost Comparison
Oil vs. gas vs. heat pump vs. propane on the same unit of heat.
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Heat Pump Operating Cost
Seasonal heating cost from efficiency and your electric rate.
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Water
Water Usage Calculator
Gallons used by showers, laundry, dishes and more.
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Water Bill Estimator
Estimate water and sewer charges from your local rate structure.
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Leak Cost Calculator
What a dripping faucet or running toilet adds to your bill.
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Housing
Mortgage Calculator
Principal, interest, taxes and insurance in one monthly number.
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Property Tax Estimator
Turn an assessed value and local rate into an annual bill.
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Rent vs. Buy
Compare the full monthly and long-term costs of each.
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Everyday
Internet Plan Comparison
Compare plans on true monthly cost after promos and fees.
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Subscription Cost Tracker
Add up what your subscriptions cost per month and per year.
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Car Loan Calculator
Monthly payment and total interest for an auto loan.
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Credit Card Interest Calculator
How long a balance takes to pay off and what it costs.
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Household Expense Planner
Lay out every recurring bill and see your monthly total.
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