Appliance Cost Calculator (Ontario)
Estimate the monthly electricity cost of any appliance using wattage, daily usage, and your electricity price.
Updated 2026‑04‑22
Useful for estimating the cost of heaters, kettles, dryers, air conditioners, computers, and other household devices.
This estimates only the usage portion of the bill. Delivery, GA, regulatory charges, and HST are additional.
How appliance electricity cost is calculated
This calculator estimates the monthly electricity cost of running a single appliance based on three inputs: wattage, hours used per day, and electricity price per kilowatt‑hour (kWh). The formula is:
(Watts ÷ 1000) × Hours per day × 30 days × Price per kWh
For example, a 1,500‑watt appliance used for 2 hours per day consumes about 3.0 kWh per day. Over 30 days, that becomes 90 kWh. At $0.12/kWh, the estimated monthly cost is about $10.80.
Why appliance wattage matters
Heating appliances consume far more electricity than electronics. Examples of high‑wattage devices include:
- portable electric heaters
- electric baseboards
- clothes dryers
- ovens and stovetops
- air conditioners
- electric water heating systems
By contrast, laptops, routers, LED bulbs, and small electronics use very little electricity even when used for many hours.
Why real costs can vary
This tool estimates the energy portion only. Actual Ontario electricity bills also include:
- Delivery charges
- Regulatory charges
- Global Adjustment
- HST
Some appliances also cycle on and off (e.g., fridges, freezers, AC units), so their real‑world usage may differ from the nameplate wattage.
Which appliances usually cost the most?
In most homes, the most expensive appliances to run are those that produce heat or move large amounts of air. Electronics are rarely the main driver of high bills.