Electricity Usage and Measurement
Generator Load Percentage Calculator
Use Generator Load Percentage when generator loading is the quantity you need. Enter connected apparent load and generator rating, then compare the answer with the equipment or operating limits that apply to your case.
Calculate Generator loading
Do not mix values recorded under different conditions.
Compare two operating cases
Change Connected apparent load from 72 kVA to 86.39999999999999 kVA as the sole changed variable. The two results are 72.00% to 86.40%.
Keep both cases when the changed input represents genuine uncertainty.
How the result is calculated
The displayed result follows loading = load ÷ rating × 100. The entered quantities are Connected apparent load and Generator rating.
With the current entries, the primary answer is 72.00%. Preserve the raw inputs when replacing this example.
Calculate generator loading from connected apparent load and generator rating. If you also need coincidence factor, continue with Electrical Coincidence Factor Calculator.
Values this page needs
Record meter scaling, time period, load profile, and applicable tariff. Do not combine a worst-case value with unrelated nominal data.
At least one field has a positive lower bound because it appears in a denominator. Use the displayed unit for every field and document conversions separately. For dimmer loading, use Dimmer Load Calculator.
- Connected apparent load
- Default example: 72 kVA. Enter connected apparent load in kVA.
- Generator rating
- Default example: 100 kVA. Enter generator rating in kVA.
Reading Generator loading
Interpret Generator loading on the same basis used for the source values. Compare it with billing rules, meter data, demand intervals, and operating schedules.
Keep the input set beside the output so another reader can reproduce it. Autotransformer Rating Calculator covers the related autotransformer winding rating step.
Using the answer downstream
Record connected apparent load and generator rating with generator loading. Include the operating state and data source.
Carry generator loading before applying any display rounding. Round at the final reporting step.
Practical limits
Motor starting and phase balance require separate checks.
Outside the entered variables, consider fixed charges, demand ratchets, seasonal rates, uncertainty, and future load change. Do not hide omitted behavior inside an unexplained correction factor.
Separate real power, apparent power, energy, and demand before entering values. For the companion unused breaker capacity calculation, open Breaker Load Margin Calculator.
Common questions before using the result
Why does Generator loading show several decimals?
Do not round between dependent calculations. Match the final display to the precision of the source data.
Why does the page show an input warning?
Use a measured positive value for Generator rating; zero cannot stand in for missing data.
Which source values should I use for Generator loading?
Use connected apparent load and generator rating from one operating condition. Use tariff periods, demand intervals, meter ratios, and operating hours from the same billing case.
What is not captured by this equation?
Motor starting and phase balance require separate checks. A broader review should include meter accuracy, sampling interval, waveform bandwidth, and conversion loss.
What can cause a different generator loading reading?
Recheck units and operating state before investigating idle consumption, load variability, tariff changes, and maintenance downtime.
How do I run a useful sensitivity check?
Change one uncertain entry at a time and preserve the baseline. Separate real power, apparent power, energy, and demand before entering values.