In Stranger Things , at least 18 children are confirmed to have been experimented on in Hawkins Lab, but the exact total could be higher and is never stated with absolute certainty in the show.

Known number of kids

  • Eleven is test subject 011, which already implies at least 11 children passed through the program.
  • Season 4 flashbacks and the episode “The Massacre at Hawkins Lab” establish that 18 numbered child subjects were present in the lab at the time of the massacre.
  • Expanded materials and analyses note that this “18” reflects the confirmed on-screen count; there may have been unnumbered or unseen subjects, but those are speculative.

How many survived?

  • Henry Creel/One (001) and Eleven both survive the massacre, though One is transformed into Vecna.
  • Kali/Eight is alive but not present in the massacre sequence, so she is counted among the surviving Hawkins Lab kids.
  • One analysis breaks it down as: 18 total subjects identified, with One killing 16 kids in the lab, leaving Eleven and Kali as the surviving “siblings.”

Why the number feels fuzzy

  • The show itself never has a character say a definitive line like “There were exactly 18 children in Hawkins Lab,” so the number comes from counting the visible and credited children in season 4 plus the numbered subjects we know from earlier seasons.
  • Tie‑in comics and expanded universe stories add detail to specific numbers (like Six or the Nine/Nine‑and‑a‑half twins), but do not clearly raise the official on‑screen total beyond those 18.

Quick forum-style takeaway

If you’re answering “how many kids were in Hawkins Lab?” for a discussion or post, the safest canon‑based line is:
“At least 18 numbered child test subjects are confirmed at Hawkins Lab, with the possibility that more existed off‑screen or unconfirmed.”

Mini SEO bits (for your post)

  • Focus phrase: how many kids were in Hawkins Lab – answer: at least 18 confirmed child subjects, possibly more off‑screen.
  • You can mention “latest news” or “trending topic” by tying it to renewed interest around Stranger Things season 5 discussions and fan theories about the “missing numbers” from the lab.

Information gathered from public forums or data available on the internet and portrayed here.