PC Energy Waste Calculator

Find out what leaving office PCs on after hours is really costing you.

Your Office Setup

Office details
PCs

Total desktop or workstation computers in your office.

watts

Typical desktop: 60-150 W idle. Laptops: 15-45 W.

hrs/day

Hours outside working hours when PCs are left powered on.

days/wk

Number of days your office operates each week.

weeks

Typically 48 weeks, allowing for holidays.

Rates and factors
per kWh

Check your electricity bill for your tariff rate.

kg/kWh

UK average: 0.233. US average: 0.386. Find your local figure online.

Estimated Annual Waste

Cost wasted
--per year
per PC--
Energy wasted
--kWh / year
kWh per PC--
CO2 emitted
--kg CO2 / year
kg CO2 per PC--
Trees to offset
--trees / year
trees per PC--

Enter the number of PCs above to see your results.