Multiplication of a Rollup gives the wrong number [solved]

[Patrick_Flanaga]

I use this base for creating invoices, and my formulas are not calculating the right numbers, giving me incorrect sums.

GW correctly rolls up (using SUM(values)) hours from a separate table, and the field is formatted as a numeric with two decimal places. But when those sums are multiplied by the Rate (a Currency field with two decimal places), it gives the wrong number.

When I copy and paste the rollup values into a new column (GW2) that is just numbers rather than rollups, and then multiply by the rate, it gives the correct number.

Example: In the below screenshot, the total number of GW hours (“GW”) is 27.87, and the rate (“Rate”) is $35/hr. In reality, 27.87 * $35 = $975.45 (“Reality”), but the product given in “GW Subtotal” is $975.33.

Formulas used:
“GW” : SUM(values)
“GW Subtotal” : GWRate
“Reality” : {GW2}{Rate}

This seems to be some bizarre rounding error, because some products are high and some are low.

Can you help?

Thanks,
Patrick

[Tyler_Kurlas]

This is how calculations work in Excel too, you have trailing figures which are not being displayed. Try using ROUND(GW,2) to trim the excess penny fractions.

[Patrick_Flanaga]

This fixed it. Thank you Tyler!