So if as of December 31st, 2024 AMD reported 100 million "game consoles" shipped, whereas they also count Steam Deck APUs into that segment ("as well as Valve Steam Deck PC"), you'd have to account an estimated 4m units of Steam Deck sold.

100 - 70 - 4 = 26m shipped Series APUs as of December 2024, which must have been higher than Xbox shipments by necessity, since AMD ships APU units for assembly.

As an addition;

My 8m (correction: it's actually an 11m gap) gap was calculated by the estimates ONLY of US and Europe sales by June 2024 - which amounted to 22.5m combined.

And as of June 2025, the sold-through estimates are at 33.3m globally, which is a gap of almost 11m units within 12 months.

How is that possible if it only sold 4.27m units globally since July 2024 to June 2025?

As I previously stated we have Xbox Series estimates at 29.04 million worldwide as of June 2024, while we now have it at 33.27 million worldwide as of June 2025. That is how I got 4.23 million.

Just using US and Europe for June 2024 is missing a big chunk of the market and is very misleading. If you want to use US and Europe for June 2024 then you need to use just US and Europe for June 2025 to get an apples to apples comparison.

This is the point that I am actually getting at [with the gaps] (and agree with Kepler2).

This figure, 29.04m, would mean that, as of June 2024, 50.82% of total global sales for the Series were made outside the US.

I find that to be highly unlikely, when Europe & Japan are basically dead for the Series for at least 22 months now.

On a sidenote:

Don't you consider AMDs first-hand Q4 2024 report of 100 million game consoles sold (to which business unit they do apply Steam Deck sales, too?)

And just for reference; do you calculate Series sell-through numbers by revenue?

Don't get me wrong: I certainly disagree with your estimates for reasons that were perfectly illustrated in the recent NeoGAF topic:

https://www.neogaf.com/threads/xbox-series-x-s-estimated-to-have-sold-37-million-units.1686826/

But I'll be the first to acknowledge your estimates (and eventually apologize) if your estimates turn out to be nearer at truth.

(But I won't take a plain statement from Microsoft "Yup, we sold 35m units!" as fact.)

51.28M

Here is the slide from AMD's earnings report. Their exact quote is "Strong current console generation with cumulative shipments surpassing 100 million in Q4'24."

The key takeaway I see is that it surpassed 100 million sometime DURING the quarter and not at the end of the quarter. The quarter ran from October 1 until December 31, 2024. 100 million is a nice milestone figure, so we are likely talking over 100 million, but under 110 million. At the end of 2024 PS5 was at 75m shipped, while we have XS at 31.99m sold. Lets say there is a 1m gap for a total of 33m shipped for XS. That would be a combined 108 million shipped. 

As far as Xbox Series having about half of sales outside the US that is pretty typical for Xbox consoles. As of the end of June 2025 the US accounts for 51% of worldwide sales for the Xbox Series. Our estimates show a similar ratio for other Xbox consoles. We have the US at 50% of worldwide Xbox 360 sales and for the Xbox One the US is at 52% of the total worldwide sales. That is why doubling NPD/Circana data for Xbox gets you a pretty good idea of worldwide sales.

This would all be much easier if we got numbers from Microsoft, but the only figure we got was from early/mid 2023 when it was revealed XS+X1 = 79m+ and XS= 21m+. That is how we got the 58 million for the Xbox One. That image I've posted below. It was revealed by Microsoft at Big Festival in Brazil, which took place in June 2023. What we don't know is when the data was pulled from. But since the event took place in June 2023 (before the end of that quarter) we are likely either talking May 2023 or possibly the end of the previous quarter, which would be March 2023.

I just want to add that yes we could be overtracked, but also could be undertracked like we were with the Xbox One. Either way sales are dropping following the price increase and it will be tough for it to top 40 million (unless we've unertracked it by several million) even if the next-gen Xbox doesn't come out until holiday 2027 or later.

AMD's Lisa Su herself lumped AMD's Steam Deck into the game consoles unit in 2022:

https://www.cnbc.com/2022/05/03/amd-earnings-q1-2022.html:

Su said that AMD's semi-custom business grew by "double-digits" on a year-over-year basis due to consumer demand for the Playstation 5, Xbox Series, and Valve's Steam Deck.

"Semi-Custom sales grew by a significant double-digit percentage year over year based on strong demand for Sony and Microsoft consoles, as well as Valve's new Steam deck."

"Sales for this game console generation continue to outpace all prior generations, and we expect 2022 to be a record year for our semi-custom business," Su said.

https://www.amd.com/en/newsroom/press-releases/2022-6-9-amd-details-strategy-to-drive-next-phase-of-growth.html

This is in alignment with their Q4 2024 report/chart of revenue that you've referenced above (563 Mio.) and the 100m shipments:

So this number has to include Steam Deck, not just PS5 and Series X|S. At least according to Su's own business statements.

(I claim the "surpassing 100 million shipments" passage indicates 104 million units at best. They would have said "surpassing 105" if it was the case.)

And as far as IDG numbers go, a third party market research firm, even take 2 themselves don't see IDG's numbers as totally reliable.

Strauss Zelnick:

"We are using IDG's projections, which are pretty substantial. So for Gen 9 alone, their view is that they're about 81 million consoles worldwide currently that was at the end of the last year, they project that will rise to 111 million by the end of this year and [175 million] (ph) by the end of 2027. Now we don't necessarily subscribe or not subscribe to those views, but that shows an awful lot of growth. And we do expect a very significant attach rate."

https://m.investing.com/news/stock-market-news/earnings-call-taketwo-anticipates-growth-with-gta-vi-on-horizon-93CH-3445805

As far as T2 goes, they'd presented another chart in 2024:

This doesn't align with known numbers we got from Sony and worldwide sell-through estimates "as of November 2024".

And frankly, this is no Xbox One situation anymore where 50:50 (US:rest of the world) being the case.

Personally, with data only from first party sources (AMD, Sony) alone, I don't see evidence the Series could sit at 33.27m units sold-through as of June 2025.

To be honest it's still surprising how much 3rd party support Xbox still gets despite the fact that it's clearly falling off hard at this point and is now selling Wii U numbers while the Switch/Switch 2 is likely going to sell 3-4 times more than it and still misses out on a few big titles.

I guess even with a 30M install base, the install base still heavily supports 3rd party games enough for a profit. Or it legit could just be the big brand name & mature image of "xbox" carrying the idea to 3rd party developers that its still a must to release their games on it, while Nintendo despite the install base still has that stigma of being too family friendly and different to be considered as a place for 3rd party game.

To be fair, it also might just be relatively easy and inexpensive to port from PS5 to Xbox to where developers wont feel much expense in doing it despite the lower install base

Moon Studios (Ori games) hit the news recently because their new game No rest for the Wicked Xbox version is not guaranteed to launch day one alongside the PS5 due to them being a small studio and having to be careful with their resources. So, we are slowly starting to see the results of years of bad sales. There's also a new game called Godbreakers that has no Xbox version announced. It's only a matter of time until the others follow really. 

I'm not sure what it would take to get the Xbox to 35 million at this point. That last million and a half is not gonna be easy.