Find month when criteria has been met (sum of project cost)

chet645 · Oct 24, 2019

All, wondering if someone can help me with a formula. I need a formula that will calculate the month when total project cost has been spent (e.g. 500 in the table below). In the table below, the correct month is 5.

[TABLE="width: 500"]
<tbody>[TR]
[TD]Month[/TD]
[TD]

0

[/TD]
[TD]

1

[/TD]
[TD]

2

[/TD]
[TD]

3

[/TD]
[TD]

4

[/TD]
[TD]

5

[/TD]
[TD]

6

[/TD]
[TD]

7

[/TD]
[TD]

8

[/TD]
[TD]

9

[/TD]
[TD]

10

[/TD]
[TD]

11

[/TD]
[/TR]
[TR]
[TD]

Project Cost

[/TD]
[TD]

100

[/TD]
[TD]

100

[/TD]
[TD]

100

[/TD]
[TD]

100

[/TD]
[TD]

100

[/TD]
[TD]

[/TD]
[/TR]
[TR]
[TD]

[/TD]
[TD]

[/TD]
[/TR]
[TR]
[TD]

Total Project Cost

[/TD]
[TD]

500

[/TD]
[TD]

[/TD]
[/TR]
[TR]
[TD]

Month of Completion

[/TD]
[TD]

5

[/TD]
[TD]

[/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

Thank you in advance for your help.

Chet

Peter_SSs · Oct 24, 2019

See if this is what you want. I have added a few examples for checking.
Formula in B5 copied across.

Excel Workbook

A

B

C

D

E

F

G

H

I

J

K

L

M

1

Month

0

1

2

3

4

5

6

7

8

9

10

11

2

Project Cost

100

50

200

100

3

4

Total Project Cost

500

150

1000

780

5

Month of Completion

5

2

8

Cost Spent

Giordano Bruno · Oct 24, 2019

Hi Peter,

You beat me, but using your layout here's another approach "=MIN(IF(SUBTOTAL(9,(OFFSET($C2:L2,0,0,1,ROW(INDIRECT("1:100")))))>=C4,ROW(INDIRECT("1:100"))),100000)" Note that the formula does not use the month row. Also, I think your formula is more elegant and I'm adding mine only because it took me such a long time to get it to work.

Peter_SSs · Oct 24, 2019

Giordano Bruno said:
Note that the formula does not use the month row.

Mine doesn't either, but a fairly simple modification to either of our formulas could do that if required.

Giordano Bruno · Oct 24, 2019

Hi Peter. I must admit I hadn't noticed that. By the way, my formula could be slightly less inelegant as "=1+MAX(IF(SUBTOTAL(9,(OFFSET($C2:L2,0,0,1,ROW(INDIRECT("1:100")))))<C4,ROW(INDIRECT("1:100"))),0)

Peter_SSs · Oct 25, 2019

Giordano Bruno said:
By the way, my formula could be slightly less inelegant as ...

Some comments:
1. I fixed your latest formula as it was cut off at the < sign
2. You hadn't mentioned that your formulas require Ctrl+Shift+Enter confirmation.
3. Your formulas return incorrect values if the project cost has not yet been spent (eg cells D4:D5 of my sample data)

Giordano Bruno · Oct 25, 2019

Thanks for the comments Peter and the correction and for taking the trouble to work through it. The following fixes the problem when the value isn't achieved "=(1+MAX(IF(SUBTOTAL(9,(OFFSET($C2:L2,0,0,1,ROW(INDIRECT("1:100")))))<C4,ROW(INDIRECT("1:100"))),0))*(SUM(C2:J2)>=C4)". But it isn't an array formula. You just enter it normally.

Peter_SSs · Oct 25, 2019

Giordano Bruno said:
Thanks for the comments Peter and the correction and for taking the trouble to work through it. The following fixes the problem when the value isn't achieved "=(1+MAX(IF(SUBTOTAL(9,(OFFSET($C2:L2,0,0,1,ROW(INDIRECT("1:100")))))<C4,ROW(INDIRECT("1:100"))),0))*(SUM(C2:J2)>=C4)". But it isn't an array formula. You just enter it normally.

Again your formula is truncated. If you post a formula with a < followed immediately by a letter that happens. You can avoid it by entering a space character after the <
The formula you tried to post was
=(1+MAX(IF(SUBTOTAL(9,(OFFSET($C2:L2,0,0,1,ROW(INDIRECT("1:100")))))< C4,ROW(INDIRECT("1:100"))),0))*(SUM(C2:J2)>=C4)

However, I disagree that it can be entered normally. In my sheet below, I have entered your formula normally in C5 and with Ctrl+Shift+Enter in C6. C6 has the correct answer, not C5

Cost Spent (2) <table border="1" cellspacing="0" cellpadding="0" style="font-family:Arial,Arial; font-size:8pt; background-color:#ffffff; padding-left:2pt; padding-right:2pt; "> <colgroup><col style="font-weight:bold; width:30px; " /><col style="width:140px;" /><col style="width:40px;" /><col style="width:40px;" /><col style="width:61px;" /><col style="width:40px;" /><col style="width:40px;" /><col style="width:40px;" /><col style="width:33px;" /><col style="width:40px;" /><col style="width:40px;" /><col style="width:26px;" /><col style="width:33px;" /><col style="width:33px;" /></colgroup><tr style="background-color:#cacaca; text-align:center; font-weight:bold; font-size:8pt; "><td > </td><td >A</td><td >B</td><td >C</td><td >D</td><td >E</td><td >F</td><td >G</td><td >H</td><td >I</td><td >J</td><td >K</td><td >L</td><td >M</td></tr><tr style="height:21px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >1</td><td style="font-size:10pt; ">Month</td><td style="font-size:10pt; text-align:right; ">0</td><td style="font-size:10pt; text-align:right; ">1</td><td style="font-size:10pt; text-align:right; ">2</td><td style="font-size:10pt; text-align:right; ">3</td><td style="font-size:10pt; text-align:right; ">4</td><td style="font-size:10pt; text-align:right; ">5</td><td style="font-size:10pt; text-align:right; ">6</td><td style="font-size:10pt; text-align:right; ">7</td><td style="font-size:10pt; text-align:right; ">8</td><td style="font-size:10pt; text-align:right; ">9</td><td style="font-size:10pt; text-align:right; ">10</td><td style="font-size:10pt; text-align:right; ">11</td></tr><tr style="height:21px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >2</td><td style="font-size:10pt; ">Project Cost</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; text-align:right; ">100</td><td style="font-size:10pt; text-align:right; ">100</td><td style="font-size:10pt; text-align:right; ">100</td><td style="font-size:10pt; text-align:right; ">100</td><td style="font-size:10pt; text-align:right; ">100</td><td style="font-size:10pt; text-align:right; ">50</td><td style="font-size:10pt; text-align:right; ">200</td><td style="font-size:10pt; text-align:right; ">100</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td></tr><tr style="height:21px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >3</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td></tr><tr style="height:21px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >4</td><td style="font-size:10pt; ">Total Project Cost</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; text-align:right; ">500</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td></tr><tr style="height:21px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >5</td><td style="font-size:10pt; ">Month of Completion</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; text-align:right; ">2</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td></tr><tr style="height:21px ;" ><td style="font-size:8pt; background-color:#cacaca; text-align:center; " >6</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; text-align:right; ">5</td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td><td style="font-size:10pt; "> </td></tr></table> <table style="font-family:Arial; font-size:10pt; border-style: groove ;border-color:#00ff00;background-color:#fffcf9; color:#000000; "><tr><td >Spreadsheet Formulas</td></tr><tr><td ><table border = "1" cellspacing="0" cellpadding="2" style="font-family:Arial; font-size:9pt;"><tr style="background-color:#cacaca; font-size:10pt;"><td >Cell</td><td >Formula</td></tr><tr><td >C5</td><td >=(1+MAX(IF(SUBTOTAL(9,(OFFSET($C2:L2,0,0,1,ROW(INDIRECT("1:100")))))< C4,ROW(INDIRECT("1:100"))),0))*(SUM(C2:J2)>=C4)</td></tr><tr><td >C6</td><td >{=(1+MAX(IF(SUBTOTAL(9,(OFFSET($C2:L2,0,0,1,ROW(INDIRECT("1:100")))))< C4,ROW(INDIRECT("1:100"))),0))*(SUM(C2:J2)>=C4)}</td></tr></table></td></tr><tr><td >Formula Array: Produce enclosing { } by entering formula with CTRL+SHIFT+ENTER!</td></tr></table> Excel tables to the web - Excel Jeanie Html 4

Giordano Bruno · Oct 25, 2019

Hi Peter. I hope you don't get annoyed with my dogged perseverance, and thanks for the tip about the space after ">", but I copied your corrected formula into my sheet and I get a 5. I'm using the same numbers as you, but the result is different. I get a 5 whether I enter the formula as an array or if I enter it normally. Can you think of any explanation why I get the same results, but you get different results? I have tried it with 150 (2) 1000 (0) and 780 (8). In each case, there is no difference between my formula entered as an array and the formula entered normally.

Peter_SSs · Oct 25, 2019

Giordano Bruno said:
Hi Peter. I hope you don't get annoyed with my dogged perseverance,

No, I don't get annoyed - you can only report what is happening for you.

Giordano Bruno said:
Can you think of any explanation why I get the same results, but you get different results?

No, I don't know why that might happen. For me, without the array entry ROW(INDIRECT("1:100")) in the formula returns just 1. With the array entry it returns the expected 1,2,3,...,100 (checked by selecting the formula cell and stepping through the formula evaluation process with the 'Evaluate Formula' facility in the Formula Auditing section of the Formulas ribbon tab)

Find month when criteria has been met (sum of project cost)

chet645

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Peter_SSs

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Giordano Bruno

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Giordano Bruno

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Find month when criteria has been met (sum of project cost)

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