Power BI got a very serious issue in computation column total??

[BobWong1]

I created a simple table visual, and I noticed the sum add-up does not tally. I used a calculator to calculate the result is $8.15. The table total value $8.13 is incorrect. It's a 2₵ difference that created serious confusion?

Each row of value checked on the data view is correct.

Is it a Power BI issue? Or I'm over-looked something?

[rsbin · Accepted solution]

@BobWong1 ,

Yes, you are overlooking a rounding issue.  I surmise you are dividing Fare by 20 to get Levy Cost.  If you expand your display to 3 decimal places then the total is correct.

16.9	20	0.845
11.7	20	0.585
25.2	20	1.26
18.6	20	0.93
12	20	0.6
17.7	20	0.885
33.6	20	1.68
26.9	20	1.345
		8.13

Trust this helps!

Regards,

[halfglassdarkly]

Technically the PowerBI total is more accurate than the excel total for the reason Rsbin outlined, however if it's important to you that they match you can use the ROUND() function to round your Levy Cost to two decimal places. That way the actual stored value, not just the display format will be rounded and your figures should match with excel.

[halfglassdarkly]

Remember the total isn't actually the sum of what is displayed above, it is the sum of [Levy Cost] when the context from [Date], [#Job], [TimeStart], [Fare] is removed. I.e the total will be subject to its own rounding, rather than summing the rounded values for each row above.

[rsbin · Accepted solution]

@BobWong1 ,

Yes, you are overlooking a rounding issue.  I surmise you are dividing Fare by 20 to get Levy Cost.  If you expand your display to 3 decimal places then the total is correct.

16.9	20	0.845
11.7	20	0.585
25.2	20	1.26
18.6	20	0.93
12	20	0.6
17.7	20	0.885
33.6	20	1.68
26.9	20	1.345
		8.13

Trust this helps!

Regards,

[BobWong1 · Accepted solution]

Result from Excel Sheet:

How to resolve this issue?

[BobWong1]

Dear rsbin,

Guess you misunderstood my question.

If you put the red-box values into Excel worksheet, then the sum is $8.15

So there is a different of 2₵. Can you explain what is causing the issue (rounding-up/down)?