JSutils for Computer Energy Saving and Energy Use Calculation
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Updated: 18-Jan-2010
JSutils Compact Disk

EnCalcEU Formulae

Version: 4.3
Size: 491KB
Released
18-January-2010
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EnCalcEU uses the following formulae to calculate the results:

Actual Results

Days

=

Date 2 - Date 1

Number Quarters (1)

=

Int ( ( ( Number Days Between Date 1 And Date 2 ) - 10 ) / ( 365 / 4 ) ) + 1

Normal Rate Units

=

Normal Rate Reading 2 - Normal Rate Reading 1

Cheap Rate Units

=

Cheap Rate Reading 2 - Cheap Rate Reading 1

Normal Rate 1 Units (2, 3)

=

Fixed Break Point: The lower value of: Normal Rate Units and
( Normal Rate 1/2 Break Point * Number Quarters in Date 1 To Date 2 )

Fixed Break Point per Day: The lower value of: Normal Rate Units and
( Rate/Day * Days )

Normal Rate 2 Units

=

Normal Rate Units - Normal Rate 1 Units

Normal Rate 1 Cost

=

Normal Rate 1 Units * Normal Rate 1 Unit Cost

Normal Rate 2 Cost

=

Normal Rate 2 Units * Normal Rate 2 Unit Cost

Cheap Rate Cost

=

Cheap Rate Units * Cheap Rate Unit Cost

Total Fixed Charge

=

Fixed Charge * Number Quarters

Total Cost

=

Normal Rate 1 Cost + Normal Rate 2 Cost + Cheap Rate Cost
+ Total Fixed Charge - ( Discount 1 * Number Quarters )

Total Cost (inc VAT) (4)

=

( Total Cost * ( 1 + VAT% ) / 100 ) - ( Discount 2 * Number Quarters )

Cost per Day (5)

=

Total Cost (inc VAT) / Days

CO2 Generated (Kg)

=

(Total Number Of Normal Rate and Cheap Rate Units Used) * CO2 Conversion Factor

1. See Using EnCalcEU for an explanation of this formula.
2. The calculation method for Normal Rate 1 Units depends on the type of Rate 2 calculation chosen.

3. The Break Point per Day is rounded down to the nearest integer.
4. If the currency selected is not UK Pounds (£) or Euros ( €) then VAT is changed to Tax.
5 . See Using EnCalcEU for an explanation of why this figure could be different to the Predicted Cost per Day .

Predicted Results

Predicted Days

=

Date 1 + No Quarters To Predict Forward (This can be less than Actual Days)

Normal Rate Units

=

( ( Normal Rate Reading 2 - Normal Rate Reading 1 ) * Predicted Days ) / Actual Days

Cheap Rate Units

=

( ( Cheap Rate Reading 2 - Cheap Rate Reading 1 ) * Predicted Days ) / Actual Days

Normal Rate 1 Units

=

Fixed Break Point: The lower value of Normal Rate Units and
( Normal Rate 1/2 Break Point * Number Predicted Quarters )

Fixed Break Point per Day: The lower value of Normal Rate Units and
( Rate/Day * Number Predicted Days )

Normal Rate 2 Units

=

Normal Rate Units - Normal Rate 1 Units

Normal Rate 1 Cost

=

Normal Rate 1 Units * Normal Rate 1 Unit Cost

Normal Rate 2 Cost

=

Normal Rate 2 Units * Normal Rate 2 Unit Cost

Cheap Rate Cost

=

Cheap Rate Units * Cheap Rate Unit Cost

Total Fixed Charge

=

( Fixed Charge ) * Number Predicted Quarters

Total Cost

=

Normal Rate 1 Cost + Normal Rate 2 Cost + Cheap Rate Cost
+ Total Fixed Charge - ( Discount 1 * Number Predicted Quarters )

Total Cost (inc VAT)

=

( Total Cost * ( 1 + VAT% ) / 100 ) - ( Discount 2 * Number Predicted Quarters )

Cost per Day

=

Total Predicted Cost (inc VAT) / Predicted Days

CO2 Generated (Kg)

=

(Predicted Number Of Normal Rate and Cheap Rate Units Used) * CO2 Conversion Factor