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Efficiency

Data Center PUE Calculator

Divide total facility energy by IT equipment energy. This is not an efficiency grade.

01 / Inputs

Same measurement interval

Enter two energies from the same interval. The unit cancels, so kWh and kW are both acceptable when they match. This is not an efficiency grade.

02 / Result

PUE and DCiE

Ready to calculate

PUE = E_facility / E_IT · DCiE = E_IT / E_facility

PUE will appear here.

Method, example and boundaries

PUE is total facility energy divided by IT equipment energy. DCiE is the inverse, IT equipment energy divided by total facility energy. The Green Grid partial-PUE example adds 300 + 200 + 200 + 1500 + 500 in the numerator and 1500 + 500 in the denominator: 2700 / 2000 = 1.35, shown as 1.35. DCiE is 2000 / 2700 = 0.7407…, shown as 0.74. Equal energies are allowed and give 1.00. A facility value below the IT value is rejected because facility energy includes the IT load.

Both numbers must cover the same interval. The label says kWh, but any matching energy unit cancels. This page does not apply cooling partial-PUE, mixed-use allocation rules, or an efficiency grade. It does not approve a design.

Source: The Green Grid White Paper #49, PUE: A Comprehensive Examination of the Metric (SRC-066). Section II defines PUE as total facility energy divided by IT equipment energy. The overview states that DCiE is the inverse. Equation 1 and the Figure 18 arithmetic were checked in the PDF on 2026-10-20. Clause numbers inside other standards, including GB 40879 grade thresholds, are UNVERIFIED and are not used.

FAQ

What does this calculator compute?

PUE is total facility energy divided by IT equipment energy. DCiE is the inverse, IT equipment energy divided by total facility energy.

Which values are rejected?

Facility energy and IT energy must be greater than zero, and facility energy cannot be below IT energy because the facility total includes the IT load. Equal energies are allowed and give a PUE of 1.

Do both numbers have to use the same interval?

Yes. Both energies must cover the same interval. The ratio does not depend on the energy unit as long as both entries use that unit. GB 40879 clause numbers and grade thresholds are UNVERIFIED and are not used as a pass/fail limit.

Source records