Google Ads shows fractional conversions like 12.4: why does the calculator ask for whole numbers?
Because the calculator treats a conversion as a whole event: an order or a sign-up. Google Ads may split the credit for one sale across several clicks or ads depending on the attribution model, so the report shows a fraction. Enter the nearest whole number, or the whole-number total from a column that counts each conversion once, and know that rounding moves CPA a little.
Where the fractions come from
When a customer passes through more than one ad before buying, say a search for your product name one day and a click on a different ad two days later, Google has to decide which ad earned the sale. Some attribution models give the whole sale to a single click; others share it, so one ad gets 0.6 of the order and another 0.4. Add those shares up for a campaign or keyword and you get a figure like 12.4. It is not an error, but it is not a count of orders you could find in your store either.
What happens if you type 12.4
The calculator shows 'Enter a whole number.' under the conversions field, and no results appear until the field is fixed. Impressions and clicks work the same way. The spend field, naturally, accepts decimals.
How much does rounding change the result?
A search campaign was shown 4,200 times and got 210 clicks for a spend of 630 AED, and the report shows 12.4 conversions. Try the two whole numbers on either side:
12 conversions: CPA 52.5, conversion rate 5.71%.
13 conversions: CPA 48.4615, conversion rate 6.19%.
The true credited value sits between the two, while CTR of 5% and CPC of 3 do not move.
The two bounds are about four apart on CPA, which is sizeable because the count is small. On a campaign with 400 conversions, a fraction of one would barely register. So the smaller the count, the more you should note in your report that conversions are rounded, and the less you should read into a small gap between two campaigns.
A suggested approach
- If your account offers a column that counts conversions as whole events, or you have the actual order count for this campaign from your store, use that.
- If not, round to the nearest whole number, and run it once at the lower and once at the upper bound if you want to see the range.
- Enter the figures in the Campaign performance calculator and note beside the result that conversions were rounded from a fractional figure.
- Use the same approach every month so comparisons stay fair.
The calculator does not connect to Google Ads or pull figures from it; it works only with what you type. To match conversions with your real store orders, tag campaign links with the UTM campaign link builder, then work out return on sales value in the ROAS calculator, which does not need a conversion count at all.
Common questions
Should 12.4 become 12 or 13?
The usual rule is the nearest whole number, so 12. What matters is applying the same rule every time rather than picking whichever looks better.
Why not simply accept fractions?
The calculator is built around real orders and sign-ups, which are whole events. Accepting fractions would blur the line between actual orders and credit shared between ads.