Understanding Load Factor
How we calculate. Load factor % = average demand ÷ peak demand × 100. See our methodology and accuracy policy .
Real-world scenario: A typical Load Factor case uses average load 6.5 and peak load 10. Enter the same figures below to reproduce the worked path.
What is Load Factor?
A demand-shape KPI for buildings, campuses, and utilities. Distinct from logistics fleet load factor (payload/cube fill).
- Same UOM for average and peak
- Higher usually means flatter load
- Period must match the peak definition
The Formula
Worked Example
Common Use Cases
- Demand charges: peak vs average
- Facility energy: load shape
- Utility planning: system load factor
Pro Tips
- Align average with the same interval as peak
- Watch weather-driven peaks
- Pair with peak-to-average ratio
| Scenario | When to use |
|---|---|
| Percent of a number | Finding a part of a whole (tax, tip, score) |
| Percent change | Comparing old vs new values |
Limitations: Load Factor results are educational energy and utilities planning aids—not engineering, grid-operations, or investment advice. Confirm definitions with your ISO/RTO, plant, and regulatory reporting standards.
Common mistakes
- Swapping part and whole: The denominator must be the full total, not a subset.
- Rounding too early: Carry extra decimal places through multi-step work before rounding the final percent.
- Mixing percent and decimal forms: Enter rates in the format the calculator labels expect.
The worked example for load factor was verified with the calculator form on this page—enter the same values to confirm the result.
When to use this calculator
- Use this page when your wording matches load factor and the form labels on screen.
- Use percent of a number for “what is X% of Y?” problems.
- Use number is what percent when you know part and whole and need the percent.
Still unsure about load factor? Start with the quick answer above, then open the linked calculator that matches your wording.
❓ Frequently Asked Questions
How do I use this load factor calculator?
For load factor, enter the values labeled on the form, then press Calculate. Compare the result to the worked example on this page.
What formula does this page use?
See the quick answer and formula box above for load factor—the same percentage calculator expression is applied to your inputs.
What if my result looks wrong?
When checking load factor, re-check part vs whole (or rate vs base), rounding, and whether percents were entered as 25 rather than 0.25 when the form expects percents.
Authoritative References
For power system and plant performance concepts, consult: