Start with your numbers.
Useful estimates for everyday decisions and bigger upgrades. Choose a tool, open its guide and replace the example values with your own.
Looking for a guide? Browse them all →Bill detective
Compare two bills to explore changes in billing days, use per day and effective price.
Open calculator →Time-of-use comparison
Compare a flat rate with peak and off-peak pricing using your own usage.
Open calculator →Compare your state
Put your electricity use and bill alongside official state averages.
Open calculator →Thermostat savings
Explore a range of possible savings and payback for a thermostat upgrade.
Open calculator →Heat pump running costs
Compare estimated heating costs using fuel prices and system efficiency.
Open calculator →Heat pump quote comparison
Compare written quotes, capacity and scope before choosing an installer.
Open calculator →Water heater payback
Estimate the payback of a heat pump water heater against a standard electric tank.
Open calculator →Emergency Heat costs
Estimate the electricity cost of electric backup heat at your settings.
Open calculator →Solar payback
Explore payback with your quote, electricity rate and export credits.
Open calculator →Solar panel sizing
Estimate panel count from your annual use, sunlight and panel size.
Open calculator →Texas solar estimate
Compare production and estimated value under your buyback assumptions.
Open calculator →Solar cleaning value
Compare a cleaning quote with the share of soiling losses you expect to recover.
Open calculator →Home battery runtime
Estimate backup runtime and check running loads and motor surge.
Open calculator →Portable backup runtime
Add up your devices and estimate how long a power station could run them.
Open calculator →EV charging costs
Compare home charging and gasoline costs using your own driving numbers.
Open calculator →LED bulb savings
Compare lighting costs based on bulb count, hours and your electricity rate.
Open calculator →Standby power costs
Estimate the cost of always-on devices and the power you could switch off.
Open calculator →Appliance payback
Use two EnergyGuide labels to compare the extra purchase price with energy savings.
Open calculator →Energy monitor payback
Estimate what a home energy monitor could save, starting at $0 if nothing changes.
Open calculator →Always-on devices
Add up the standby power of devices that never switch off and see the yearly cost.
Open calculator →Renter savings planner
See which renter-friendly changes lower your bill, counting only what you pay for.
Open calculator →Apartment thermostat check
Check which kind of smart thermostat can work in your apartment.
Open calculator →Apartment AC size and cost
Find the cooling capacity your room needs and what it costs to run.
Open calculator →Door and window sealing
Compare the cost of weatherstripping and window kits with the heating and cooling you may save.
Open calculator →Smart blinds window check
See which windows benefit from smart blinds in summer and in winter.
Open calculator →Smart bulb or switch
Compare the cost of smart bulbs and a smart switch for one light fixture.
Open calculator →Forgotten lights
Estimate what lights left on cost and what a motion or vacancy sensor saves.
Open calculator →Solar light fit check
Find the type of solar light that suits your spot and how much sun it gets.
Open calculator →Solar output estimate
A simplified estimate of what a solar system could produce where you live.
Open calculator →Solar credit rough guide
Check whether the federal residential solar credit could still apply. Not tax advice.
Open calculator →Community solar savings
Estimate what a community solar subscription would really save on your bill.
Open calculator →Balcony solar kit
Estimate what a plug-in balcony kit could produce and save.
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