Electricity Cost
Electricity costs sneak up on households because individual appliances seem cheap to run — until you add them all up. Our calculator lets you see the cost of any appliance over hours, days, months, or years, compare multiple appliances, and identify which devices are driving your electric bill.
Annual Cost
$
About the Electricity Cost Calculator
Electricity costs sneak up on households because individual appliances seem cheap to run — until you add them all up. Our calculator lets you see the cost of any appliance over hours, days, months, or years, compare multiple appliances, and identify which devices are driving your electric bill.
How to use it
- Enter the appliance wattage (found on the device label or manual).
- Enter hours per day and your electricity rate ($/kWh — check your bill).
- See cost per hour, day, month, and year.
- Add multiple appliances to calculate total household electricity cost.
Formula & methodology
kWh per day = watts × hours per day / 1,000. Monthly kWh = kWh/day × 30.44. Monthly cost = monthly kWh × rate ($/kWh). US average: $0.16/kWh (2024). Annual cost = kWh/day × 365 × rate. Standby power ("vampire power"): average US home wastes 5–10% of energy on idle electronics.
Common use cases
- Identifying energy hogs: electric heaters (1,500W) vs LED bulbs (10W)
- Deciding whether an energy-efficient appliance pays for itself
- Budgeting for a new appliance: "how much will this AC add to my bill?"
- EV charging cost: battery kWh × rate = cost per full charge
- Solar panel sizing: knowing total household kWh consumption
Frequently asked questions
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