The starting number is small and fairly steady. The final number is not. This page is part of our explainer on how Google decides which People Also Ask questions to show, and it covers what you see before you click, how fast the box grows, whether it ever stops, and how PAA Box counts depth.
What you see before you click
Most of the time, four questions. That’s what we saw on 27 September 2026: our harvest for “people also ask” (US, English, desktop) started with 4 visible questions. All four were on topic, and the first off-topic question arrived right after them, at position 5. Earlier studies agree on the count. Semrush’s 2020 study of one million US desktop keywords says: “Usually, the initial PAA feature box will contain 4 questions, but sometimes there are only 3 at a time.” (Semrush) STAT’s 2016 study described boxes with “anywhere from one to four related questions.” (STAT, 2016)
Whether you get a box at all depends on the search, but it’s common. STAT’s 2023 study of 10,000 head terms in the US and UK found PAA on over 80% of the results pages it tracked. (STAT, 2023)
What happens when you open one
Google adds more questions to the bottom of the box. Moz’s Britney Muller described expanding a question “to see 2 or 3 other related questions appear at the bottom.” (Moz, 2017) Advanced Web Ranking’s guide says the same: four questions to start, then “two or three additional questions” with each click. (AWR) Search Engine Roundtable’s report on the 2017 launch was more careful: Google “may dynamically load one or two or more options in that box.” (Search Engine Roundtable)
Our harvest came out a little lower. To grow the “people also ask” box from 4 questions to 50 unique ones, the harvester opened about 25 questions (52 confirmed expansions). That’s a little under two new questions for each question opened. Repeats are part of the gap. Muller and STAT both saw Google offer questions again that were already in the box, so not every open adds something new. Our other two harvests that day, for “people also ask tool” and “people also ask seo”, ended at 49 and 50 questions.
Is there a maximum?
Google has never published one, and we found no reliable source for a hard cap. What exists are observations, mostly from 2016 and 2017:
- Muller reported boxes that “can continue into the hundreds.” At an exhaustive point, “typically ~300+”, Google started offering the first two questions again.
- Her timeline also notes one box that “maxed out at 9.”
- STAT looked at one of Muller’s boxes: 204 questions, 26 of which had already appeared. STAT read the repeats as a sign that a limit exists.
So the honest answer is that it depends on the topic, and counts from 2017 may not hold today. In practice, the limit you hit first is relevance, not the box. In our harvest, only 6 of the 50 questions for “people also ask” were about PAA. We break that down in why People Also Ask drifts off topic.
Why your count won’t match someone else’s
- The box changes between searches. When STAT ran the same keywords twice in 2016, 12% of the second searches returned all-new questions.
- Device matters. STAT’s 2023 study found that about 6,500 of roughly 23,000 unique questions (28%) only ever appeared on one device type.
- Your path matters. New questions follow whichever question you open, so two people clicking different questions grow two different boxes.
- Method matters. Clicking questions open in place follows one path through a single box. Searching each question separately, as our Serper depth pass did, gives every question a fresh box of its own.
Depth levels D0 to D3
PAA Box counts depth the way the box grows. D0 is what Google shows before any clicks. Each level after that opens the questions from the level above and collects what they reveal. The times below are the ones the extension shows before you start.
| Level | Name | What you get | Questions only | With answers (Pro) |
|---|---|---|---|---|
| D0 | Lid off | The questions Google already shows | ~5 sec | ~30 sec |
| D1 | One layer | Plus the questions revealed by opening D0 | ~10 sec | ~1 min |
| D2 | Two layers | Plus the layer below that | ~30 sec | ~4 min |
| D3 | All the way | Plus one more layer | ~1-2 min | ~12 min |
With answers on (a PAA Box Pro feature, coming soon), PAA Box also saves Google’s answer and source for each question, which is why those runs take longer. Either way, the CSV export keeps depth, question and parent question on every row, so you can see exactly which question each one came from.
Our Serper depth pass shows how layers stack up, using the search-each-question method rather than clicking. Starting from 18 seed searches and following each one down three levels, it kept 17 questions at D1, 30 at D2 and 43 at D3, and dropped 49 as off topic along the way. Each layer added more questions, and more to check.
How deep should you go?
- D0 for a quick read of a search: the questions Google treats as its closest match.
- D1 for a content brief: the follow-ups people ask next. Expect some drift already.
- D2 or D3 for mapping a whole topic, as long as you filter. That’s where most of the noise piles up.
If you want to try it on your own searches, PAA Box is in the Chrome Web Store, listed for now as “BlogStorm: People Also Ask Tool”.