How to Use This Calculator
- 1
Enter Device Details
For each of the 5 devices, enter a name, its power rating in Watts, and the average daily run hours. Leave unused device slots at 0.
- 2
Set Electricity Rate
Enter your average cost per kilowatt-hour ($/kWh) from your utility bill. The US average is about $0.13/kWh.
- 3
Review Your Results
See the Daily Load, Monthly Load, Annual Cost, and Peak Device. The Insights panel shows your biggest energy consumer, monthly budget impact, and daily cost breakdown with a device-by-device energy bar. Scroll down for the full device table and monthly consumption chart.
Example Calculation
A homeowner wants to understand the energy consumption and cost of their main appliances to identify potential savings.
Device 1 (Air Conditioner)
1,500 W, 8 hrs/day
Device 2 (Refrigerator)
200 W, 24 hrs/day
Device 3 (Lighting)
100 W, 6 hrs/day
Device 4 (TV)
150 W, 4 hrs/day
Device 5 (Washing Machine)
500 W, 1 hr/day
Electricity Rate
$0.13/kWh
Results
Daily Load
18.50 kWh
Monthly Load
555.0 kWh
Annual Cost
$877.83
Peak Device
12.00 kWh/day
Tips
Identify Energy Hogs
The Peak Device result shows which appliance drives the most consumption. In the example, the Air Conditioner accounts for 65% of the daily load at 12 kWh/day — $569/year just from one device.
Consider Phantom Load
Many devices consume small amounts of power even when off (phantom load). Add 5-10W for frequently plugged-in devices like TVs, computers, or chargers that are not fully disconnected.
Adjust for Seasonal Usage
For AC or heaters, adjust Daily Run Hours seasonally. Running 8 hours in summer vs 2 hours in spring changes the AC's contribution from $569/year to $142/year. Recalculate for each season.
Use the Breakdown Bar
The insights panel shows a visual breakdown of energy usage by device. This makes it easy to spot which devices to target for efficiency upgrades or usage reduction.
Understanding where your electricity goes is the first step toward energy savings.
The Load Profile Calculator quantifies daily, monthly, and annual energy usage across up to five appliances.
With the default inputs, five common household devices consume 18.5 kWh/day, costing $877.83/year at $0.13/kWh — with the air conditioner driving 65% of the total load.
Calculating Your Appliance Energy Consumption
The Load Profile Calculator computes energy consumption for each device and aggregates them into a comprehensive profile.
The core formulas are:
Daily kWh per Device = (Power in Watts x Daily Run Hours) / 1,000
Total Daily Load = Sum of all device daily kWh
Monthly Load = Total Daily Load x 30
Annual Load = Total Daily Load x 365
Cost = Load (kWh) x Electricity Rate ($/kWh)
Worked Example: Five Household Appliances
A homeowner enters five devices at a $0.13/kWh electricity rate:
| Device | Watts | Hours/Day | Daily kWh |
|---|---|---|---|
| Air Conditioner | 1,500 | 8 | 12.00 |
| Refrigerator | 200 | 24 | 4.80 |
| Lighting | 100 | 6 | 0.60 |
| TV | 150 | 4 | 0.60 |
| Washing Machine | 500 | 1 | 0.50 |
| Total | 18.50 |
Results:
- Daily Load: 18.50 kWh
- Monthly Load: 18.50 x 30 = 555.0 kWh
- Annual Load: 18.50 x 365 = 6,752.5 kWh
- Daily Cost: 18.50 x $0.13 = $2.41
- Monthly Cost: 555.0 x $0.13 = $72.15
- Annual Cost: 6,752.5 x $0.13 = $877.83
- Peak Device: Air Conditioner at 12.00 kWh/day (65% of total)
The air conditioner alone costs $569/year — targeting its efficiency or reducing run hours offers the biggest savings potential.
Energy Efficiency and Demand-Side Management
Understanding your load profile enables informed decisions about energy efficiency.
The average US household consumes about 900 kWh per month in 2026.
With 555 kWh/month from just five devices, these appliances represent a significant portion of total consumption.
Key strategies for reducing your load profile:
- Upgrade high-consumption devices: An Energy Star AC can reduce consumption by 15-20%
- Adjust run times: Reducing AC from 8 to 6 hours saves $142/year
- Address phantom loads: Unplugging devices when not in use can save 5-10% on standby consumption
Beyond Simple Consumption: Advanced Load Analysis
For commercial and industrial settings, advanced load profile analysis examines hourly or minute-by-minute power fluctuations.
Peak demand charges can account for 30-50% of a commercial electricity bill.
Strategies like load shifting (moving energy-intensive operations to off-peak hours) and power factor correction can significantly reduce costs for facilities with demand charges exceeding $10,000 annually.
Frequently Asked Questions
What is an energy load profile?
An energy load profile is a detailed breakdown of how electricity is consumed by various devices over a period. It shows per-device kWh consumption, costs, and share of total usage. This helps identify peak consumers, inefficient appliances, and savings opportunities.
How is kWh calculated for a device?
Kilowatt-hours (kWh) are calculated by multiplying the device's power rating in watts by its daily run hours, then dividing by 1,000. For example, a 1,500W air conditioner running 8 hours/day consumes (1,500 x 8) / 1,000 = 12 kWh/day, costing $1.56/day at $0.13/kWh.
What is the average US electricity rate?
The average US residential electricity rate is approximately $0.13-$0.16 per kWh as of 2026, though it varies significantly by state. Hawaii averages over $0.30/kWh while states like Louisiana average around $0.10/kWh. Check your utility bill for your exact rate.
How does this calculator handle monthly variations?
The calculator uses 30 days for monthly estimates and 365 days for annual totals. The monthly consumption chart accounts for actual days per month (28-31), so you will see slight variations in the chart. February shows the lowest consumption due to having only 28 days.
Why is my air conditioner the biggest energy consumer?
Air conditioners combine high wattage (1,000-3,000W) with long run times (6-12 hours/day). At 1,500W for 8 hours, the AC consumes 12 kWh/day — more than a refrigerator running 24 hours at 200W (4.8 kWh). The AC alone accounts for 65% of the example load profile.