Electricity Load Factor Calculator

Calculate electricity load factor from a utility bill or EMS: LF = kWh ÷ (peak kW × hours). Pick billing days (28/30/31) to set hours, or enter average kW ÷ peak kW. Not a factory equipment roll-up—use Factory Load for that.

Calculator

Quick: kWh + peak kW + hours → LF %. Also: average kW ÷ peak, with optional hours to estimate period energy (usage companion—not a full bill cost tool).

Input mode

Energy (kWh) Billing-period energy from the utility bill or meter.

Period hours Required for bill mode. In average mode, used to estimate period kWh = avg kW × hours (usage screen).

Peak demand (kW) Utility demand (often 15- or 30-min) for the same period.

About this calculator

This load factor calculator measures how flat your load profile is—average vs peak—for tariff and utilisation reviews. For kWh × $/kWh bill cost, use the Energy Estimator. Roll up equipment kW with Factory Load. 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.

Continue Your Calculation

Use average kW from this result in the Energy Estimator, or roll up peak kW in the Factory Load Calculator (links update from your inputs).

Energy Estimator →

Load factor quick reference

LF = kWh ÷ (peak × hours). Click a row to load the calculator.

Peak kW	Hours	LF
100	730	≈65%
100	730	≈49%
100	730	≈55%
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 — total energy on the bill for the window (often labeled “Usage” or “kWh”).
Peak kW — maximum demand (15- or 30-min) for the same window.
hours — length of the window (use 28/30/31-day chips above, or 8760 for a year).

Where to find values on a bill: copy period kWh, metered peak demand (kW), and billing days → hours. Misaligned windows (energy from one month, peak from another) inflate or deflate LF.

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.

Load factor vs electricity usage

Use this page for utilisation shape (average vs peak). Use the Energy Estimator for kWh × $/kWh bill cost. Do not treat LF % as a dollar bill by itself.

Goal	Tool
Bill / EMS peak vs average → LF %	This page — Load Factor
Estimate monthly kWh / electricity cost	Energy Estimator (kW×hours or kWh×rate)
Roll up devices → facility kW	Factory Load Calculator
Peak kW → transformer kVA	kW to kVA → Transformer Size

What LF % implies for usage (same peak)

LF	At 100 kW peak · 730 h	Usage meaning
≈49%	≈36,000 kWh · avg 49 kW	Spiky / batch — demand charges may dominate
≈55%	≈40,150 kWh · avg 55 kW	Typical mid industrial utilisation
≈65%	≈47,500 kWh · avg 65 kW	Flatter profile — more energy for same peak
≈96%	≈70,000 kWh · avg 96 kW	Near-continuous — energy cost rises with LF

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 difference between load factor and electricity usage?

Usage / consumption is energy (kWh) or bill cost (kWh × $/kWh). Load factor is a ratio of average to peak demand—how flat the profile is. Same peak can have very different kWh depending on LF. For dollars, use the Energy Estimator.

How do I estimate electricity consumption from peak and load factor?

Average kW = peak kW × LF, then kWh = average kW × hours. Example: 100 kW peak × 0.55 LF × 730 h ≈ 40,150 kWh. Then price with $/kWh on the Energy Estimator.

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 does 55% load factor energy consumption mean?

Average demand is 55% of peak. At 100 kW peak and 730 h, average ≈ 55 kW and energy ≈ 40,150 kWh. Use LF for utilisation / demand-charge context; size gear on peak.

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.