Energy & operations

Equipment Electricity Cost Calculator

Estimate electricity use from input power, equipment count and operating time. Apply your energy rate and a separately entered monthly charge.

10 / ESTIMATE RUNNING COST

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INPUT GROUP 01

Electrical input and operating load

Enter electrical input watts per device, rather than mechanical output power.

Input power per deviceRated electrical input or measured average draw.Number of devicesWhole devices with the same power and schedule.Average fraction of input powerUse 100% for measured average watts or actual on-time; avoid counting cycling twice.

INPUT GROUP 02

Monthly schedule and tariff

Use a flat energy rate. The annual estimate repeats this same month twelve times.

Scheduled hours per dayOperating window to which the average power fraction applies.Operating days per monthA representative month, up to 31 days.Energy rate per kWhFlat volumetric energy charge, in the selected currency.Additional monthly chargeInclude only charges attributable to this comparison; charged even at zero use.

Check the assumptions before acting on a result.

Read the method and example

YOUR CALCULATION

Electricity cost reflects the entered average load and usage schedule.

Average combined draw (kW)

2.25

Monthly energy use (kWh)

396 kWh

Monthly energy charge

$71.28

Monthly cost including fixed charge

$71.28

Cost for 12 identical months

$855.36

Usage and monthly cost at selected daily hours

Usage and monthly cost at selected daily hours
Hours per day	Monthly energy (kWh)	Monthly cost
4 hr	198 kWh	$35.64
8 hr	396 kWh	$71.28
12 hr	594 kWh	$106.92

Keep the calculation

Saving is optional and stays on this device. Unsaved edits are not kept when you leave. CSV includes every input and the current results.

Illustrative inputs loaded. Replace them with your own assumptions.

How the equipment electricity cost calculator works

Average input kW = watts per device × number of devices × average power fraction ÷ 1,000. Monthly energy in kWh = average input kW × scheduled hours per day × operating days per month.

Monthly energy charge = kWh × energy rate, rounded half-up to cents. Monthly modeled cost adds the separately rounded additional monthly charge. The annual estimate is twelve identical modeled monthly costs; it does not forecast a calendar year or account for seasonal operation.

A load fraction can represent reduced average power, cycling within an operating window, or a combined estimate of those effects. If measured watts already average the operating cycle, or the entered hours represent actual on-time at the stated input power, use 100% unless a distinct adjustment is justified. Applying the same reduction twice understates energy use.

Kilowatts measure power; kilowatt-hours measure energy over time. Nameplate draw may differ from actual use. This model does not infer motor efficiency or electrical capacity. Demand charges, power-factor charges, time-of-use tariffs, tiers, standby consumption outside the schedule, taxes and seasonal differences are excluded unless separately allowed for in your own entered costs. A whole-site utility standing charge should not be attributed entirely to a device unless that allocation fits your question.

Worked example

Two devices at 1,500 input watts each, averaging 75% of that draw over 8 scheduled hours a day and 22 days a month, use 2.25 kW × 176 hours = 396 kWh. At an illustrative $0.18 per kWh and no additional monthly charge, that is $71.28 for the modeled month, or $855.36 for twelve identical months. The rate and load fraction are examples, not current local tariffs or measured consumption.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

EIA: measuring electricity

Calculation methods, testing and sources · Practical calculation guides