# PUE Calculator

> PUE: PUE = total facility energy ÷ IT equipment energy. Methodology stated, your own inputs only.

Page: https://freecalculator.tech/tools/pue-calculator
Last reviewed: 2026-10-20

## Formula

PUE = total facility energy ÷ IT equipment energy.

- Methodology: Power Usage Effectiveness as defined by The Green Grid (also ISO/IEC 30134-2), using energy over a period rather than a single power reading.
- State where IT energy is measured (UPS output, PDU or server).
- Annual figures smooth out seasonal cooling.
- PUE = total facility energy ÷ IT equipment energy.
- Inputs used: Total facility energy in the period, IT equipment energy in the same period.

## Inputs

- Total facility energy in the period
- IT equipment energy in the same period

## Worked example: A year

1,500,000 kWh facility, 1,000,000 kWh IT.
1. 1,500,000 ÷ 1,000,000 = 1.500.

## Common questions

### Is there a target or industry average built in?

No. Results depend on climate, design, load and measurement point, so none is shown. Compare against your own history.

### Power or energy?

The Green Grid recommends energy over a full year; an instant power ratio can mislead. Check the formula, example, and limitations on this page before using the result for a real data centers decision.

### What is DCiE?

The reciprocal of PUE as a percentage — the share of energy reaching IT equipment. Check the formula, example, and limitations on this page before using the result for a real data centers decision.

### How do I use the PUE Calculator?

Enter the required values for Total facility energy in the period, IT equipment energy in the same period. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.

### What formula does the PUE Calculator use?

PUE = total facility energy ÷ IT equipment energy. The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.

### Can the PUE Calculator be used for exact decisions?

Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.

## Limitations and assumptions

- Says nothing about IT efficiency itself.
- Depends on measurement point.
- Results are estimates built only from the figures you enter. No electricity, fuel or gas price, equipment efficiency or benchmark is built in — tariffs vary by supplier, region and time, and equipment data must come from the manufacturer. Designs and installations must be checked by a qualified professional.
- The result depends on the values you enter for this pue calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.

## Sources

- The Green Grid — https://www.thegreengrid.org/en/resources/library-and-tools/20-PUE%3A-A-Comprehensive-Examination-of-the-Metric

## Cite this page

- APA: Free Calculator. (2026, October 20). PUE Calculator. https://freecalculator.tech/tools/pue-calculator
- MLA: "PUE Calculator." Free Calculator, 20 Oct. 2026, https://freecalculator.tech/tools/pue-calculator.
- Link: PUE Calculator — Free Calculator, https://freecalculator.tech/tools/pue-calculator