Calculating total units where rates vary

VBremner

New Member
Joined
Nov 21, 2023
Messages
3
Office Version
  1. 365
Platform
  1. Windows
I am trying to find a formula that will calculate the total value of a number of units, where there are different band rates that all need to be applied.

For example, I need to find the total of 385002 units.
50000 of the units are charged at £1 per unit, The next 49999 are charged at £0.9 per unit and so on. That would leave 10002 units to be charged in the lowest band.
Everything in black below is what I need on the spreadsheet, the red is just me showing the example of how it needs to calculate. I would like the outcome in cell G under total.

I have tried playing with varied iterations of "IF" and "Sumproduct" but I can't get anything to work when it gets over 1000001 units.

Any advice is appreciated, thanks

1700575420993.png
 

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I have not worked out the solution but, should the result not be closer to £285,001?

It looks like you have priced the 10002 as 124999.
 
Upvote 0
The number of units does not seem to add up, see how i have worked it out below with two helper columns:
Book1
ABCDEFG
1QuantityRate per unitNumber of unitsTotal
250000£1.0050000£50,000.00385002£285,001.00
3100000£0.9050000£45,000.00
4150000£0.8050000£40,000.00
5250000£0.70100000£70,000.00
6375000£0.60125000£75,000.00
7500000£0.5010002£5,001.00
81000000£0.400£0.00
92000000£0.300£0.00
10385002£285,001.00
Sheet1
Cell Formulas
RangeFormula
D2:D9D2=C2:C9*B2:B9
G2G2=SUM(D2:D9)
C2:C9C2=LET(n,IF(A2<$F$2,A2-IF(ISTEXT(A1),0,A1),$F$2-IF(ISTEXT(A1),0,A1)),IF(n<0,0,n))
C10:D10C10=SUM(C2:C9)
Dynamic array formulas.
 
Last edited:
Upvote 0
The number of units does not seem to add up, see how i have worked it out below with two helper columns:
Book1
ABCDEFG
1QuantityRate per unitNumber of unitsTotal
250000£1.0050000£50,000.00385002£285,001.00
3100000£0.9050000£45,000.00
4150000£0.8050000£40,000.00
5250000£0.70100000£70,000.00
6375000£0.60125000£75,000.00
7500000£0.5010002£5,001.00
81000000£0.400£0.00
92000000£0.300£0.00
10385002£285,001.00
Sheet1
Cell Formulas
RangeFormula
D2:D9D2=C2:C9*B2:B9
G2G2=SUM(D2:D9)
C2:C9C2=LET(n,IF(A2<$F$2,A2-IF(ISTEXT(A1),0,A1),$F$2-IF(ISTEXT(A1),0,A1)),IF(n<0,0,n))
C10:D10C10=SUM(C2:C9)
Dynamic array formulas.
Thank you!!!

We had the number of units calculated from 50001 - 100000, so not quite the 50000. I can edit this on our main spreadsheet, but I will definitely give this a go.
 
Upvote 0

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