PUE Calculator (Data Centre Energy Efficiency)
Power usage effectiveness and DCiE of a data centre or server room, with how much power and energy go to cooling and losses instead of computing.
Results
PUE (power usage effectiveness)
1.500
DCiE (IT share of the energy)
66.7
%
Power for cooling, losses and the rest
500.0
kW
Overhead energy per year
4380.0
MWh
What this tool does
PUE divides everything the facility draws by what reaches the IT equipment, so 1.0 would mean every watt does computing. A PUE of 1.5 means half as much again goes to cooling, power conversion and lighting; large modern facilities report figures close to 1.1, while small server rooms are often 2 or worse. Compare like with like: PUE depends on the weather and on how loaded the servers are, so annual averages are more honest than a single reading.
Formula
PUE = total facility power ÷ IT power · DCiE = 1 ÷ PUE
Variables
| Symbol | Meaning | Unit |
|---|---|---|
pt | Total facility power | kW |
pi_ | IT equipment power | kW |
PUE | PUE (power usage effectiveness) | — |
DC | DCiE (IT share of the energy) | % |
OV | Power for cooling, losses and the rest | kW |
OE | Overhead energy per year | MWh |
Worked example
- Total facility power1500 kW
- IT equipment power1000 kW
- PUE (power usage effectiveness)1.500
- DCiE (IT share of the energy)66.7 %
- Power for cooling, losses and the rest500.0 kW
- Overhead energy per year4380.0 MWh
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- Prices and emission factors are yours to enter. The tool ships with no tariff table and assumes nothing about your country or supplier, so change the defaults to match your own bill.