UtiliNest.

Electrical Calculators

Energy Consumption Calculator

Estimate daily, monthly, and annual kWh from appliance watts and operating time.

Reviewed July 26, 2026 Runs locally No sign-up
Global formulaFormula-based estimate
=Your result will appear here

Enter values and calculate.

APPLICABILITY

Where this result fits

Region
Global formula
Result type
Formula-based estimate
Standards basis
NIST Guide to the SI
Edition / version
Named formula or standard edition; implementation reviewed July 26, 2026

Important: Confirm equipment ratings, installation conditions, protection requirements, and the electrical code adopted where the work will be performed. Electrical safety policy

STEP BY STEP

How to use the Energy Consumption Calculator

  1. Enter the known electrical values and choose the applicable phase where offered.
  2. Select Calculate to apply the formula shown on this page.
  3. Review units and assumptions before using the result in design work.
  4. Have safety-critical work checked against equipment instructions and local electrical code.

ACCURACY & LIMITS

What to know before using the result

HELP

Frequently asked questions

How accurate is the Energy Consumption Calculator?

The calculator uses the formula shown on this page and keeps full numeric precision internally before formatting the result. Nameplate wattage may differ from measured average power.

Does the Energy Consumption Calculator upload my input?

No. The calculation or processing runs locally in your browser. UtiliNest does not receive or store the values you enter.

Can I use the Energy Consumption Calculator on a phone?

Yes. The inputs, result controls, and explanatory content are designed for current mobile and desktop browsers.

Where does the Energy Consumption Calculator apply?

Applicability: Global formula. Result classification: Formula-based estimate. Confirm equipment ratings, installation conditions, protection requirements, and the electrical code adopted where the work will be performed.

SOURCES

Definitions and references

Reviewed against the references below on July 26, 2026. Links open the source publisher's website. Read the source policy

NIST Guide to the SI

KEEP GOING

Related tools

All tools
Ohm’s LawAmps to WattsWatts to AmpsAmps to kWkW to Amps