Load Factor Calculator
Calculate electricity load factor from a utility bill or EMS: LF = kWh ÷ (peak kW × hours). Also supports average kW ÷ peak kW. Not a factory equipment roll-up—use Factory Load for that.
Calculator
Quick: kWh + peak kW + hours. Advanced: enter average kW directly.
About this calculator
This load factor calculator measures how flat your load profile is—average vs peak—for tariff and utilisation reviews. Roll up equipment kW with Factory Load. Definitions: Load Factor Guide. Browse the Power Calculator hub.
Calculation Results
≈ 65.1% (LF 0.651)
47,500 kWh ÷ (100 kW × 730 h)
Formula: LF = kWh ÷ (Peak kW × hours)
Estimate only—align kWh, peak, and hours to the same billing window. Not for branch-circuit or motor-start design.
Load factor quick reference
LF = kWh ÷ (peak × hours). Click a row to load the calculator.
| kWh | Peak kW | Hours | LF |
|---|---|---|---|
| 100 | 730 | ≈65% | |
| 100 | 730 | ≈49% | |
| 491 | — | ≈65% | |
| 100 | 730 | ≈96% |
Load factor formula
LF = Average kW ÷ Peak kW
From a utility bill: LF = kWh ÷ (Peak kW × hours) (same period).
- kWh — energy in the billing window.
- Peak kW — maximum demand in that window.
- hours — length of the window (month ≈ 730 h, year = 8760 h).
Example: 47,500 kWh, 100 kW peak, 730 h → average ≈ 65.1 kW → LF ≈ 65%.
Definitions & plant example: Load Factor Guide. Equipment roll-up: Factory Load Calculator.
When to use which load tool
| Goal | Tool |
|---|---|
| Bill / EMS peak vs average → LF % | This page — Load Factor |
| Roll up devices → facility kW | Factory Load Calculator |
| Energy cost screening | Energy Estimator |
| Peak kW → transformer kVA | kW to kVA → Transformer Size |
Frequently Asked Questions
How do you calculate a load factor?
LF = average kW ÷ peak kW for the same period. From a bill: LF = kWh ÷ (peak kW × hours). Example: 47,500 kWh, 100 kW, 730 h → ≈ 65%.
What is the formula for load factor?
LF = Average load ÷ Peak load, or kWh ÷ (Peak kW × hours). Result is a decimal or percent.
What does 50% load factor mean?
Average power is half of peak in that window—common for batch plants. Size transformers on peak, not average.
What's a good load factor value?
Higher means flatter utilisation; many industrial sites run ~50–75%. Pair LF with peak kW for sizing. See the Load Factor Guide.
Is load factor the same as diversity factor?
No. Diversity compares connected equipment to coincident demand. Load factor compares average to peak over time. See Diversity Factor Guide.