Appliance Running Cost Calculator
Calculate electricity running costs for space heaters, air fryers, AC units, and home appliances per hour, day, month.
Power Rating & Usage Frequency
Energy Consumption & Cost Breakdown
Typical Household Appliance Running Costs Benchmark
| Appliance Category | Typical Wattage | Avg Daily Use | Monthly Cost ($0.18/kWh) |
|---|---|---|---|
| Space Heater | 1,500 W | 4 hours | $32.87 |
| Central Air Conditioning | 3,500 W | 6 hours | $115.05 |
| Refrigerator (Auto-Cycle) | 150 W | 24 hours (Duty cycle) | $19.72 |
| Air Fryer / Toaster Oven | 1,700 W | 30 mins | $4.65 |
| Gaming PC Setup | 450 W | 4 hours | $9.86 |
| LED Lighting (10 Bulbs) | 90 W | 5 hours | $2.47 |
About this tool
How to use it
- Select an appliance preset (e.g. Space Heater, Air Conditioner, Air Fryer) or type a custom wattage rating.
- Enter your typical operating time in hours per day and active usage days per week.
- Verify your electric utility tariff price per kilowatt-hour ($/kWh or £/kWh from your power bill).
- Inspect the real-time cost breakdown per hour, day, month, and year, along with equivalent carbon emissions.
Why it matters
Heating, cooling, and cooking appliances account for over 60% of average residential utility bills. Because electric bills only show a monthly aggregate figure, homeowners often don't realize that running a single 1,500W portable space heater for 8 hours daily can add over $70 per month to their energy bill.
When to use it
Use this calculator when budgeting winter heating or summer cooling expenses, deciding whether to replace an older inefficient appliance, comparing air fryers vs. conventional ovens, or auditing home electricity spikes.
Good to know
Cost is calculated as: (Watts / 1,000) × Hours Used × Electricity Rate ($/kWh). Duty cycles for thermostatically controlled appliances (like refrigerators and central air conditioners) represent the percentage of time the compressor actually draws power.
Common questions
How much does it cost to run a 1,500 Watt space heater?
At an average US electricity rate of $0.18 per kWh, a 1,500W space heater costs approximately $0.27 per hour to run. Running it for 8 hours every day costs roughly $2.16 per day, or about $65.70 per month.
Where can I find my appliance's wattage rating?
Check the manufacturer's data plate or sticker located on the back, bottom, or door frame of the appliance. If only volts (V) and amps (A) are listed, multiply Volts × Amps to calculate Watts (for example: 120V × 12.5A = 1,500 Watts).
Is an air fryer cheaper to run than an oven?
Yes, significantly. While both draw similar wattage (~1,700W vs 2,500W), an air fryer heats up instantaneously and cooks food in roughly half the time. Baking chicken breasts takes ~15 minutes in an air fryer (~$0.07) compared to 45 minutes including preheating in a standard electric oven (~$0.34).
What household appliances use the most electricity?
Central air conditioning and heat pumps, electric water heaters, electric clothes dryers, and electric space heaters consume the highest wattage in the home. Appliances with heating elements draw significantly more power than electronics or LED lighting.
What is a duty cycle in refrigeration and AC?
A refrigerator is plugged in 24 hours a day, but its cooling compressor only runs when interior temperatures rise. A typical refrigerator runs roughly 30% to 50% of the time (a 35% duty cycle), consuming far less electricity than continuous operation.