An appliance energy cost calculator shows you exactly how much each device in your home costs to run. Whether it's your refrigerator humming 24/7 or a space heater on cold evenings, knowing the real electricity cost helps you identify energy hogs, compare upgrade options, and lower your monthly utility bill.
Select an Appliance
Enter Custom Wattage
Cost Breakdown
What If? Upgrade Comparison
Compare your current appliance against a newer, more efficient model.
Current Appliance
New Appliance
Top Energy Hogs
See which common appliances cost the most to run at your electricity rate.
Energy Saving Tips
- ✓ Unplug phantom loads — devices like TVs, game consoles, and chargers draw 5-10W even when off. Use a power strip to cut standby power.
- ✓ Upgrade to Energy Star — certified appliances use 10-50% less energy. Prioritize replacing your oldest refrigerator, washer, and dryer first.
- ✓ Use ceiling fans strategically — fans at 75W cost pennies per day and let you raise your AC thermostat by 4°F, saving up to 15% on cooling.
- ✓ Run full loads only — washers, dryers, and dishwashers use nearly the same energy whether half-full or full. Wait for a full load to maximize efficiency.
- ✓ Switch to LED lighting — LED bulbs use 75% less energy than incandescent and last 25 times longer. Replacing 20 bulbs can save $150+/year.
- ✓ Use time-of-use rates — if your utility offers TOU pricing, run dryers, dishwashers, and EV chargers during off-peak hours for lower rates.
How to Use the Appliance Energy Cost Calculator
Every appliance in your home draws electricity, but most people have no idea which ones are silently draining their budget. This appliance energy cost calculator helps you figure out the real cost of running any device — from your kitchen refrigerator to your garage space heater. All you need is the wattage rating, your daily usage estimate, and the electricity rate from your utility bill.
Step 1: Pick an Appliance or Enter Custom Wattage
Use the "Pick an Appliance" tab to choose from a database of over 40 common household appliances organized by category — kitchen, laundry, climate control, entertainment, personal care, and outdoor. The wattage auto-fills with a typical rated value for that device. If your appliance is not listed, switch to the "Custom Wattage" tab and enter the watts from the manufacturer label. You can usually find this on a sticker on the back or bottom of the device, or in the product manual.
Step 2: Set Your Usage and Rate
Enter how many hours per day you typically use the appliance. A refrigerator runs 24 hours, a hair dryer maybe 15 minutes (0.25 hours), and a TV might be on for 4 hours in the evening. Then enter your electricity rate in dollars per kilowatt-hour. The default is $0.16/kWh, close to the U.S. national average. Check your utility bill for your exact rate — it is usually labeled "energy charge" or "price per kWh."
Step 3: Review Your Cost Breakdown
Click Calculate Energy Cost to see instant results for daily, monthly, and yearly costs along with kWh consumption for each period. The formula is straightforward: kWh = Watts x Hours / 1000, then multiply by your rate. Monthly and yearly figures use 30.44 and 365.25 days respectively to account for varying month lengths.
Step 4: Compare Old vs New Appliances
Use the "What If?" comparison section to see how much you would save by upgrading to a more efficient model. Enter the wattage of your current appliance and the replacement, plus the purchase price of the new unit. The calculator shows annual savings and estimates how many months it takes for the energy savings to pay back the upgrade cost — helping you make an informed purchase decision.
Step 5: Identify Your Top Energy Hogs
The "Top Energy Hogs" section ranks all appliances in the database by monthly cost at your electricity rate. This gives you a quick visual of which appliances draw the most power and where you should focus your energy-saving efforts. Combine this with the energy saving tips section for practical strategies to lower your electricity bill.
FAQ
Is this appliance energy cost calculator free?
Yes, the appliance energy cost calculator is completely free with no account or signup required. All calculations run locally in your browser and no data is ever sent to a server.
Is my data private and safe?
Absolutely. Everything runs locally in your browser using JavaScript. No usage data, appliance selections, or electricity rates are transmitted anywhere. Close the tab and all data is gone.
How do I find the wattage of my appliance?
Check the label on the back or bottom of the appliance for rated wattage. You can also find it in the owner's manual or product listing online. If only amps and volts are listed, multiply them together to get watts (W = V x A). For U.S. appliances, multiply amps by 120.
Why is rated wattage different from actual usage?
Rated wattage is the maximum power draw. Most appliances cycle on and off — a refrigerator runs its compressor only part of the time, for example. Actual consumption is typically 30-60% of rated wattage. Use a plug-in energy monitor like a Kill-A-Watt for precise readings.
What is the average electricity rate in the US?
The average U.S. residential electricity rate is approximately $0.16 per kWh as of 2025-2026, though rates vary widely by state. Hawaii is the most expensive (over $0.35/kWh) while states like Idaho and Louisiana are below $0.10/kWh. Check your utility bill for your exact rate.
Which appliances cost the most to run?
The biggest energy hogs are typically central air conditioners, electric dryers, hot tubs, pool pumps, and electric water heaters. Space heaters and ovens also draw significant power. The key factor is both wattage and hours of use — a 75W ceiling fan running 24/7 can cost more than a 2500W oven used 30 minutes a day.
How does the 'What If' comparison work?
Enter the wattage of your current appliance and a replacement model to see side-by-side daily, monthly, and yearly costs. The tool calculates your annual savings and estimates a payback period based on the price difference and energy savings. It helps you decide if upgrading to a more efficient model is worth the investment.
How accurate is this calculator?
The estimates are mathematically precise given your inputs. However, real-world costs may differ because appliances cycle on/off, usage varies seasonally, and electricity rates can have time-of-use tiers. For the most accurate picture, use actual wattage readings from a plug-in energy monitor rather than rated wattage from the label.