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## Calculate Toner Usage - Total row doesn't sum up.

Dear Members,

I got stucked with what seems to be an easy ride, but apparently is above my skillset and somehow wasn't able to find out correct answer.

What I'm trying to calculate is how many toner units I will need based on the number of pages I'm printing per month.

- MIF = Machine in field.

- AMPV = Average Monthly print volume

- Black Yield = Number of pages a toner can Print.

The formulas and model it is simple...

Tables:

• Print Volumes: it tells me, for each country, month and model, how many pages are printed.
• Machine table: It tells me, how many machines of each model has each customer.

Formula:

Potential Units = ( Number of pages printed per month / Toner Yield) * Number of machines

Potential Units = CALCULATE(SUM((PrintVolumes[AMPV_Black]/PrintVolumes[Black_Yield]))*[# of MIF_Gap])

If you see below table, the calculation is working well in the level of model (lowest one) but when I go one level up, the sum up values doesn't work. You could see the Potential Toner Units BK and the Pages columns.

After thinking for a bit, I noticed is a BODMAS issue and I need to evaluate the expression for each row using SUMX but I'm not able to get the right DAX expression.

Incorrect Formula (actual) --> Potential = SUM(AMPV)/AVG(Yield) * Sum(MIF)

Correct Formula (future) -->Potential = sum(AMPV * MIF)/AVG(Yield)

Any help will be more than welcomed.

4 REPLIES 4
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I tried to post the example several times but I alwas get an error...

Super User
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Super User

Please provide sample data that covers your issue or question completely, in a usable format (not as a screenshot).

Do not include sensitive information or anything not related to the issue or question.

If you are unsure how to upload data please refer to https://community.fabric.microsoft.com/t5/Community-Blog/How-to-provide-sample-data-in-the-Power-BI-...

Please show the expected outcome based on the sample data you provided.