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Electricity Cost Calculator

Calculate how much it costs to run any appliance. Add multiple devices, set your electricity rate, and see daily, monthly, and yearly costs instantly.

per kWh
Currency: $

Add Appliances

Click a preset to add it, or add a custom appliance below.

Click a preset above or add a custom appliance to get started.

About This Tool

Ever wonder how much your air conditioner, space heater, or gaming PC actually costs to run? This calculator turns watts and hours into dollars (or any currency) — so you can see exactly where your electricity bill goes. Add as many appliances as you want. Each one shows its individual cost, and the total updates in real time. Whether you're trying to cut your energy bill, comparing LED vs. incandescent bulbs, or deciding if that old fridge is worth replacing — this is the tool that answers the question. The formula is simple: Watts × Hours per day ÷ 1,000 × Rate per kWh = Daily cost. Multiply by 30 for monthly, 365 for yearly. This calculator does it all for you and breaks down the numbers so you can make informed decisions.

How to Use

1. Set your electricity rate (cost per kWh) — check your utility bill or use a regional preset 2. Click a preset appliance or add a custom device with its wattage 3. Set how many hours per day each appliance runs 4. View the cost breakdown: per appliance and total, daily/monthly/yearly 5. Add or remove appliances to compare scenarios 6. Click "Copy Link" to save or share your calculation

Formula

Daily kWh = Watts × Hours per day ÷ 1,000 Daily cost = Daily kWh × Rate per kWh Monthly cost = Daily cost × 30 Yearly cost = Daily cost × 365

Frequently Asked Questions

How much does it cost to run an air conditioner?
A typical window AC (1,500W) running 8 hours a day at $0.16/kWh costs about $1.92/day, $57.60/month, or $700.80/year. A central AC (3,500W) at the same rate costs $4.48/day or $134.40/month. Your actual cost depends on wattage, usage hours, and your local electricity rate.
How do I calculate my electricity cost?
Multiply the appliance wattage by hours of use per day, divide by 1,000 to get kWh, then multiply by your rate per kWh. For example: a 100W bulb running 10 hours = 1 kWh. At $0.16/kWh, that's $0.16/day or about $4.80/month.
What is a kWh?
A kilowatt-hour (kWh) is the standard unit of electrical energy. It means using 1,000 watts for 1 hour. Your electricity bill is measured in kWh. A 100W bulb running for 10 hours uses 1 kWh. A 2,000W heater running for 1 hour also uses 2 kWh.
How much electricity does a refrigerator use?
A modern refrigerator uses 100–400W but cycles on and off, averaging about 150W of continuous use (roughly 3.6 kWh/day). At $0.16/kWh, that's about $0.58/day or $17.28/month. Older models can use 2–3× more.
How much does it cost to charge a phone?
A phone charger uses about 5W. Charging for 2 hours a day uses 0.01 kWh. At $0.16/kWh, that's $0.0016/day — less than $0.60 per year. Phone charging is one of the cheapest things on your electricity bill.
What uses the most electricity in a home?
The biggest electricity consumers are typically: air conditioning/heating (30-50% of the bill), water heater (14-18%), washer/dryer (13%), refrigerator (4-8%), and lighting (9-12%). Use this calculator to compare your specific appliances.
How much does electricity cost per kWh?
Average electricity rates vary by region: USA $0.16/kWh, UK £0.28/kWh, EU €0.25/kWh, Australia A$0.30/kWh, India ₹8/kWh, Japan ¥31/kWh. Rates vary significantly by state/region, time of day, and provider. Check your utility bill for your exact rate.

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