Electricity Usage and Measurement
Electrical Coincidence Factor Calculator
Use Electrical Coincidence Factor when coincidence factor is the quantity you need. Enter coincident demand and sum of individual peaks, then compare the answer with the equipment or operating limits that apply to your case.
Set up the Electrical Coincidence Factor case
Check the source and units before calculating.
Before entering values
Use tariff periods, demand intervals, meter ratios, and operating hours from the same billing case. Nameplate and meter values are not interchangeable unless they describe the same condition.
At least one field has a positive lower bound because it appears in a denominator. Confirm decimal placement whenever a source uses a different unit scale. For round-trip efficiency, use Battery Round-Trip Efficiency Calculator.
- Coincident demand
- Default example: 180 kW. Enter coincident demand in kW.
- Sum of individual peaks
- Default example: 250 kW. Enter sum of individual peaks in kW.
Coincidence factor: calculation method
Here, Coincidence factor is obtained from coincidence = coincident ÷ individual peaks × 100. The formula draws on Coincident demand and Sum of individual peaks.
For the example shown, coincidence factor equals 72.00%. Treat that value as a demonstration, not a recommendation.
Calculate coincidence factor from coincident demand and sum of individual peaks. If you also need diversity factor, continue with Electrical Diversity Factor Calculator.
Transferring the result
Archive coincident demand and sum of individual peaks with coincidence factor. Identify the instrument, rating, or assumption behind each entry.
Transfer coincidence factor with all available digits during downstream arithmetic. Keep a separate displayed value if reporting precision differs.
How to use the result
Use Coincidence factor as one quantified check within the larger decision. Compare it with billing rules, meter data, demand intervals, and operating schedules.
Save the raw entries before testing another scenario.
Common entry mistakes
Unit-prefix mistakes often dominate the arithmetic error.
Recheck decimal placement and unit conversion when the answer looks unusual.
What the formula leaves out
Loads must belong to the same aggregation.
Additional checks may be needed for idle consumption, load variability, tariff changes, and maintenance downtime. Use measurements, manufacturer data, or another calculation for effects that can change the decision.
Separate real power, apparent power, energy, and demand before entering values.
Questions about Electrical Coincidence Factor
Which assumptions matter most here?
Loads must belong to the same aggregation. Also consider idle consumption, load variability, tariff changes, and maintenance downtime.
Why might a second instrument give another answer?
First confirm that the measurements match the equation. Then review idle consumption, load variability, tariff changes, and maintenance downtime.
How should I compare two Electrical Coincidence Factor cases?
Keep unaffected entries fixed so the cause of the difference remains visible. Record meter scaling, time period, load profile, and applicable tariff.
Can I select equipment from this number alone?
The calculator does not approve equipment or supply an unexplained margin. Compare against billing rules, meter data, demand intervals, and operating schedules.
When should I round coincidence factor?
Do not round between dependent calculations. Match the final display to the precision of the source data.