Electricity Usage Calculator
Electricity usage measures energy consumed over time in kilowatt-hours (kWh). Formula: kWh = (Watts × Hours) / 1000. A 60W bulb used 5 hours daily consumes 0.3 kWh/day or 9 kWh/month. Annual cost = kWh × rate. Average US home uses 877 kWh/month. Major consumers: HVAC (40%), water heater (14%), appliances (13%), lighting (9%). Track usage to identify savings opportunities.
Track electricity usage at the appliance level. Add appliances with wattage, hours per day, and quantity to calculate daily, monthly, and annual kWh consumption. See a ranked breakdown of your biggest energy consumers and get tips for reducing usage.
Electricity Rate ($/kWh)
Quick Add Preset Appliance
Your Appliances
Appliance 1
Appliance 2
Appliance 3
Appliance 4
Total Household Electricity Usage
Daily
17.40 kWh
$2.09
Monthly
522.00 kWh
$62.64
Annual
6.35 MWh
$762.12
Per-Appliance Breakdown
| Appliance | Wattage | Hrs/Day | Qty | Daily kWh | Monthly kWh | Annual kWh | Monthly Cost |
|---|---|---|---|---|---|---|---|
| Refrigerator | 150W | 24h | 1 | 3.6 | 108 | 1314 | $12.96 |
| Air Conditioner | 1500W | 8h | 1 | 12 | 360 | 4380 | $43.20 |
| TV | 100W | 5h | 2 | 1 | 30 | 365 | $3.60 |
| LED Bulb | 10W | 8h | 10 | 0.8 | 24 | 292 | $2.88 |
| Total | 17.40 | 522.00 | 6351.00 | $62.64 | |||
Biggest Energy Consumers
Tips for Reducing Usage
💡 Upgrade to Energy Star Appliances
Energy Star certified appliances use 10-50% less energy than standard models. Prioritize replacing your biggest energy consumers first.
💡 Use Smart Power Strips
Phantom loads from electronics on standby can add 5-10% to your electricity bill. Smart power strips cut power when devices are off.
💡 Optimize AC Usage
Set your thermostat to 78°F in summer. Each degree lower can increase energy use by 3-5%. Use ceiling fans to feel cooler without lowering the thermostat.
💡 Run Appliances During Off-Peak Hours
If your utility offers time-of-use rates, run dishwashers, washers, and dryers during off-peak hours (typically evenings and weekends) to save money.
💡 Air-Dry Clothes When Possible
Clothes dryers are one of the biggest energy consumers at 3,000W. Air-drying even half your loads can save $100+ per year.
💡 Replace Incandescent Bulbs with LEDs
LED bulbs use 75% less energy and last 25 times longer than incandescent bulbs. A home with 30 bulbs can save $200+ per year by switching.
💡 Maintain Your Refrigerator
Clean refrigerator coils annually, ensure door seals are tight, and keep it set to 37°F. A well-maintained fridge uses less energy to keep food cold.
💡 Reduce Hot Water Usage
Water heaters account for about 18% of home energy use. Lower the thermostat to 120°F, fix leaks, and use low-flow fixtures to cut consumption.
How Usage Is Calculated
- Daily kWh = (Wattage × Hours per day × Quantity) ÷ 1,000
- Monthly kWh = Daily kWh × 30 days
- Annual kWh = Daily kWh × 365 days
- Cost = kWh × Electricity rate ($/kWh)
- Average US household uses about 886 kWh per month (~$142 at $0.16/kWh)
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How does the electricity usage calculator work?
- Add each appliance in your home with its wattage, daily hours of use, and quantity. The calculator computes daily, monthly, and annual kWh consumption for each appliance and your entire household. It also ranks appliances by energy use so you can see which ones consume the most.
- What is the difference between this and the electricity cost calculator?
- The electricity cost calculator focuses on computing costs for individual appliances. The electricity usage calculator is designed for whole-household tracking — add all your appliances, see total consumption, and get a ranked breakdown of your biggest energy consumers with percentage shares.
- How do I find the wattage of my appliances?
- Check the label on the appliance (usually on the back or bottom), look in the owner's manual, or search the model number online. Wattage may also be listed as amps × volts. Common examples: LED bulb (10W), TV (100W), refrigerator (150W), air conditioner (1,500W), clothes dryer (3,000W).
- What does quantity mean in the calculator?
- Quantity lets you account for multiple identical appliances. For example, if you have 10 LED bulbs running 8 hours a day, set quantity to 10 instead of adding 10 separate entries. The calculator multiplies the energy use by the quantity automatically.
- How much electricity does an average household use?
- The average US household uses about 886 kWh per month (about 29.5 kWh per day). This varies significantly by region, climate, home size, and number of occupants. Homes in warmer climates with heavy AC use tend to consume more.
- How can I reduce my household electricity usage?
- Focus on your biggest consumers first — typically AC, water heater, and dryer. Switch to Energy Star appliances, use LED bulbs, eliminate phantom loads with smart power strips, optimize thermostat settings, and run appliances during off-peak hours if your utility offers time-of-use rates.