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Home energy calculators
Each calculator uses current Ontario prices and shows every assumption, so you can replace our defaults with numbers from your own bills.
Last reviewed November 2, 2026
How we review content
Electricity price plan comparisonCompare Ontario's Time-of-Use, Ultra-Low Overnight and Tiered electricity price plans using your own monthly usage and daily routine.Open calculatorHydro bill estimatorEstimate a complete Ontario electricity bill — commodity, delivery, regulatory charges, HST and the Ontario Electricity Rebate — for any monthly usage.Open calculatorHome energy checkupAnswer 12 quick questions about your home and habits to get a home energy score and a prioritized list of the upgrades and habits that will save you the most.Open calculatorHeat pump sizing estimateEstimate your home's design heating load and the cold-climate heat pump capacity you'd need in your part of Ontario, before you talk to contractors.Open calculatorWater heater comparisonCompare annual running costs and 15-year total cost for gas tank, electric tank, heat pump, tankless and rented water heaters in Ontario.Open calculatorLED lighting savingsCalculate annual savings and payback from replacing incandescent, halogen and CFL bulbs with LEDs at Ontario electricity prices.Open calculatorBackup power sizingPick the circuits you'd want running during a power outage and see how much battery storage or generator capacity it would take, and for how long.Open calculatorHeat pump vs. furnace costEstimate annual heating costs and emissions for a heat pump, hybrid system, gas furnace, oil, propane or electric baseboard in Ontario.Open calculatorRebate finderAnswer a few questions about your home to see which Ontario and federal energy rebates and programs you may qualify for.Open calculatorAttic insulation savingsEstimate heating savings and payback from adding attic insulation in Ontario, based on your current R-value, region and fuel.Open calculatorAppliance energy costCalculate what your household appliances and electronics cost to run each year at Ontario electricity prices.Open calculatorEV charging costEstimate the cost of charging an electric vehicle at home in Ontario on each price plan and compare it with gasoline.Open calculatorThermostat setback savingsEstimate how much you could save on heating by lowering your thermostat overnight and while you're away.Open calculatorSolar savings estimatorEstimate solar production, bill savings and payback for an Ontario home, and compare net metering against the solar rebate route.Open calculator
Calculators provide estimates for general information only. Results depend on the accuracy of the inputs and on assumptions described in each tool. They are not a quote, an energy audit or financial advice. For a precise picture of your home, consider a professional home energy assessment.