Why does the Ads dashboard show a fractional conversion count like 0.29?

First look at which level you are viewing. Seeing a fractional value in a campaign, keyword or device breakdown is normal: DDA distributes credit across several clicks and that row shows only its own share. The fraction stays no matter how far you widen the window. When you sum all parts of the same order the result should equal one. If it is still fractional after summing at order level, the report date range is excluding some of the contributing clicks; widen the window to cover the full conversion window and the value resolves to one. In neither case is the tag the first place to look.

If I never see a fractional value, is DDA not working?

No, it means your paths are single-touch. Seeing a fractional value requires more than one Google Ads interaction on the path, and only Google interactions enter that pool; direct, email and organic are not part of the distribution. On a single-interaction path there is nothing to divide, so credit lands whole. In that case every primary conversion action fired in the same visit writes a full credit and the Conversions column exceeds one on a single order.

Does changing the lookback window change the conversion count?

It does not change the stored data, but it does change what the report shows, and those are not the same thing. A concrete example: in one of the accounts I examined, widening the lookback window from thirty to ninety days for the same week (the dashboard offers 30, 60 and 90) raised the reported conversion total by roughly four and a half percent and the value by roughly two. The reason: the report only shows last click conversions falling inside the selected window, so at a narrow setting the conversions whose eligible interaction sits further back drop out entirely. The same window also affects the model's campaign breakdown; the brand campaign's loss under DDA went from fifteen percent at thirty days to twenty-two percent at ninety. Both sides of a comparison must be read at the same window.

Does switching attribution model change the account total?

In the account I measured it did not. I pulled the model comparison report between last click and DDA at three separate lookback windows and at account level the two models totalled exactly the same in all three, in conversion count and in value. But Google does not document this equality as a guarantee; what the documentation says is only that the two models can produce the same results in certain situations. You would expect a redistributing model to preserve the total, but you still need to verify it in your own account with a two-minute pull. What does change is the campaign distribution: while the account total stays fixed, campaign rows can move by tens of percent.

If the Ads value to GA4 revenue ratio is 1.00 on matched orders, is the setup correct?

No, that inference only runs one way. If the ratio deviates from 1.00, one of four things is broken: dynamic value sending, currency, whether tax, shipping and discounts are treated the same way, or one send per order. But not deviating guarantees nothing. If the same duplicate firing exists in both systems the ratio still comes out at 1.00, a static value can happen to equal the order amount, and two opposing errors in currency and tax can cancel each other out.

Fractional Conversions in the Ads Dashboard: The Model or the Date Range?

What does a fractional value like 0.29 against a single order in Google Ads actually mean? DDA's credit distribution and the report date range side effect get conflated. The test that separates them, a measured total preservation at account level, and how the lookback window changes things.

TL;DR

A fractional conversion value in the Ads dashboard has two distinct causes and they must not be conflated. A fraction in a campaign or keyword breakdown is the model itself: DDA distributes credit across several clicks, and it stays however far you widen the window. A value still fractional after the whole order is summed points at something else entirely. The question that separates them is simple: at what level are you seeing the fraction.

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