ENERGY STAR Computer Energy Use Calculator

Basic Settings

Adjust - Sleep Settings

Adjust - Energy Use

Adjust - Usage Patterns

Results

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ENERGY STAR Computer Power Management Savings Calculator
  Quick Calculator - First Step in Taking the Pledge  
  Instructions: Use this simple calculator to estimate typical savings from ENERGY STAR qualified computers and/or power management features. Your estimated savings from this calculator will transfer directly over to your pledge form on the blue "Pledge" tab below.  
  ENERGY STAR Qualifed Computers and Monitors  
  Enter the number of ENERGY STAR qualified: Desktop Notebook  
  a) Computers used and/or to be used in place of standard computers  
  b) LCD monitors used and/or to be used in place of CRT monitors    
  Power Management Features  
  Enter the number of desktops* and notebooks* that are configured and/or will be configured to automatically enter: Desktop Notebook  
  c) "Standby" or "hibernate" mode when inactive (i.e.,  CPU, hard drive, etc. go to sleep)  
  d)  "Monitor shut down" mode when inactive (i.e., monitor/display goes to sleep)  
  Assumptions  
  e) Enter cost of electricity OR select the state in which the computers are operated, and choose commercial or residential service
 		  
  f) Roughly what percentage of your computers are currently turned off each night and during weekends, holidays and vacations by users?**  
    Use Other Turn Off Rate?  
         
    Other Turn Off %  
         
  After completing this page, click the green "Results" tab below to view your estimated savings OR click the red "Adjust" tabs below to perform customized calculations of energy savings specific to your environment.  
         
*Includes both ENERGY STAR and non-ENERGY STAR      
  **Default of 36% as the percentage of computers turned off each night is based upon 2004 Lawrence Berkeley National Lab Report entitled "After-hours Power Status of Office Equipment and Inventory of Miscellaneous Plug-Load Equipment"      
***If your organization always shuts off their monitors at night the turn off rate should be set to 100%,       
****If your organization never shuts off their monitors at night, the turn off rate should be set to 0%.      
Notes about defaults and assumptions in the Quick Calculator:      
1) Assumes standard monitor is a CRT monitor and an ENERGY STAR qualified monitor is an LCD monitor.      
2) All other assumptions can be seen by clicking the red "Adjust" tabs below.      


Adjust Sleep Settings Sheet

ENERGY STAR Computer Power Management Savings Calculator
What power management settings?
Instructions: Enter the settings you intend to use on monitors and computers.  EPA recommends setting computers to enter system standby or hibernate after 15 to 60 minutes of inactivity and setting monitors to enter sleep mode after 5 to 20 minutes of inactivity.  The lower the setting, the more energy you save.    
  DESKTOPS        
Monitors: a) Monitors enter low-power sleep mode after how many minutes of inactivity? minutes  
Computers: b) Computers enter system standby or hibernate mode after how many minutes of inactivity?   minutes  
     
  NOTEBOOKS        
Displays/Screens: a) Displays enter low-power sleep mode after how many minutes of inactivity? minutes  
Computers: b) Computers enter system standby or hibernate mode after how many minutes of inactivity?   minutes  
     
           
  After completing this page, click the green "Results" tab below to view your estimated savings OR use the other red "Adjust" tabs below to perform customized calculations specific to your environment.  
           
         
Notes about defaults and assumptions:        
The number of minutes of inactivity prior to standby or hiberate modes is used to estimate the total time a machine spends in low power modes.    
(Based on surveys performed by The Cadmus Group, an ENERGY STAR technical support contractor.)        


Adjust Energy Use Sheet

ENERGY STAR Computer Power Management Savings Calculator
How much energy do they consume?
Instructions: Enter the amount of power your monitors and desktops typically consume under a normal workload.  For most estimates, the default values shown to the right are adequate.   ENERGY STAR-qualified standard machines  
Monitors: a) Enter the power consumed by a representative monitor in active mode (in Watts)    
b) Enter the power consumed by a representative monitors in sleep mode (in Watts)    
           
Computers: c) Enter the power consumed by a representative desktop computers in active mode (in Watts)    
d) Enter the power consumed by a representative desktop computers in sleep mode (in Watts)    
e) Enter the power consumed by a representative notebook (both display and computer) in active mode (in Watts)*    
       
  f) Enter the power consumed by a representative notebook (both display and computer) in sleep mode (in Watts)*    
         
           
  After completing this page, click the green "Results" tab below to view your estimated savings OR use the other red "Adjust" tabs below to perform customized calculations specific to your environment.  
           
         
Notes about defaults and assumptions:        
All figures are based on CCAP.        
*Notebook power consumption assumes 50% of power gets used to power the computer and 50% to power the display        


Adjust Usage Patterns Sheet

ENERGY STAR Computer Power Management Savings Calculator
How are your PCs used?
Instructions: Enter information about your organization.      
a) How many hours in a typical workday in your organization?    
b) How many days in a typical work week in your organization?    
c) How many non-working days per year are typical for your organization?  E.g., vacation days, sick days, holidays, etc.?    
   
d) What (real) discount rate do you want to use in calculating 3-years savings?    
       
After completing this page, click the green "Results" tab below to view your estimated savings OR use the other red "Adjust" tabs below to perform customized calculations specific to your environment.      
       
     
Notes about defaults and assumptions:      
A real discount rate of 4 percent is assumed, which is roughly equivalent to the nominal discount rate of 7 percent (4 percent real discount rate + 3 percent inflation rate).


Result Sheet
ENERGY STAR Computer Power Management Savings Calculator
             
Savings Estimate
             
  Energy
Saved
Annually
(kWh)		 Dollars
Saved
Annually		 3-Year Totals
  $ Savings Pollution Prevented: CO2 (in tons) Equivalent to:
  Acres of trees planted  Number of cars removed 

Savings from monitors:
Savings from notebooks:
Savings from desktops:
Total savings from ENERGY STAR
qualified monitors & computers:
             
Savings from monitors going into sleep mode:
Savings from notebook displays going into sleep mode:
Total savings from monitor sleep mode:
             
Savings from desktops in standby or hibernate mode:
Savings from notebooks in standby or hibernate mode:
Total savings from system standby and hibernate mode:
             
Total savings from monitor and computer sleep settings:
             
Total Savings:
           
To use this savings estimate in your pledge form for the "Low Carbon IT Campaign" click the blue "Pledge" tab below.  

Testimonial

“Madera Unified School District wants to do its part to conserve energy.  We took a look at our equipment and found a great way to both conserve energy and save the school district thousands of dollars per year in energy costs.”

Steve Imrie 
Director of Information Services 
Madera Unified School District 

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