Winter bills feel unpredictable, but most of the jump comes from a few appliances running for more hours. You can estimate each one with three numbers.
1. The formula
Cost = watts ÷ 1,000 × hours used × price per kWh.
The wattage is on the label or in the manual. The price per kWh is on your bill (use the unit rate, not the total divided by days, if you also pay a fixed daily charge).
2. A worked example
A 1,500 W space heater running 5 hours a day uses 7.5 kWh a day, about 225 kWh a month. At $0.18 per kWh that's roughly $40 a month for one room. A 60 W electric blanket for 8 hours a night uses about 14 kWh a month, around $2.60 at the same price.
3. Rank your appliances
Do this for heaters, the dryer, the oven, a hot tub or a second fridge. Usually one or two items explain most of the increase, and those are the only ones worth changing.
4. Turn the winter peak into a monthly number
Add up the extra winter cost, divide by 12 and set that amount aside every month. Then a January bill is already paid for when it arrives, instead of landing on a card.
5. Check your tariff once a year
Time-of-use plans, fixed versus variable rates and standing charges differ a lot between providers. Compare using your own yearly kWh, which is on your bill.
Free tools
- Electricity cost calculator: https://smartbudgetsheets.surge.sh/calculators/electricity-cost-calculator/?utm_source=mataroa
- Sinking funds calculator (spread yearly costs into monthly amounts): https://smartbudgetsheets.surge.sh/calculators/sinking-funds-calculator/?utm_source=mataroa
- Savings Goals & Sinking Funds Tracker (Payhip): https://payhip.com/b/ZbfXe?utm_source=mataroa
- 42 free budget templates, pay what you want ($0 is fine): https://smartbudgetsheet.gumroad.com/l/ngpkrb?utm_source=mataroa
General information. The price per kWh is an example; use the rate on your own bill.