MrBeast lit up X on the Fourth of July with a deceptively simple offer: reply with the exact number of pennies filling a glass-walled room and win $10,000.
The post exploded past 6.8 million views and 121,000 replies within hours, with fans flooding the thread with guesses. Here’s the problem: nearly all of those replies are worthless.
Buried in the official rules — hosted as a PDF on MrBeast’s promo site, which approximately nobody in the reply thread bothered to read — is a requirement that instantly disqualifies the overwhelming majority of entries: your reply must include the hashtag #Promotion to count.
Scroll the thread. Almost no one used it.
The Rules Everyone Skipped
The fine print changes the entire game, and not just because of the hashtag. The key details from the official rules:
- #Promotion is mandatory. No hashtag, no entry. The 121K replies without it are noise.
- One entry per person, period. Multiple guesses across replies or alt accounts don’t help you — only your first entry counts, and the rest are thrown out. The spray-and-pray crowd guessing fifty numbers in a row eliminated themselves after guess one.
- It’s not exact-or-nothing. If nobody nails the precise count by the end of the promotion period, the $10,000 goes to the closest guess, with the earlier timestamp winning ties.
- The contest runs a full year — from July 4, 2026 through July 4, 2027. This isn’t a reply-in-the-first-hour sprint; it’s a marathon that rewards whoever does the math.
- Winners are contacted by DM and have three days to respond, so anyone entering with a locked-down or abandoned account is throwing the prize away.
The rules also confirm where the penny room comes from: it was featured during MrBeast’s appearance on ABC’s Disney Celebrates America: Countdown to Nashville’s Star-Spangled Bash July 4th special.
That matters for anyone serious about winning, because broadcast footage means multiple camera angles of the room, far better source material for estimating the count than a single promo photo.
So How Many Pennies Are Actually in There?
The photo gives us enough to run the numbers.
Using the couch and bed for scale, the glass enclosure works out to roughly 400 square feet, with about 330–350 square feet of exposed penny surface once you subtract the furniture. The coins piled against the glass suggest a depth somewhere between four and eight inches.
A penny is 19.05mm across and 1.52mm thick. Loosely poured coins settle at roughly 55–60% packing density, which works out to somewhere in the neighborhood of 37,000–39,000 pennies per cubic foot.
Run the multiplication and the room holds somewhere between 4.5 million and 8.5 million pennies, call it $45,000 to $85,000 in one-cent pieces, with the midpoint landing around 6.5 million.
For context, MrBeast has done this before at smaller scale: his 2018 video “I Put Millions Of Pennies In My Friends Backyard” used $20,000 worth, exactly two million pennies.
Banks ship pennies in $25 bags of 2,500 coins, and MrBeast’s team orders in clean dollar amounts. The real count is almost certainly a multiple of 2,500, and very possibly a round figure like $50,000 (5 million), $75,000 (7.5 million), or $100,000 (10 million) built for a video title. It’s also possible they could add a penny or two to the total so the exact number isn’t as clean.
The Winning Strategy
Given the rules, the smart play is obvious.
Every round number — 5 million, 10 million — has already been guessed hundreds of times, and among the eligible hashtagged entries, the early timestamps on those numbers are long gone.
Your one entry should be an oddly specific multiple of 2,500 inside the 5–8 million band, because if the true count is something like 6,562,500 — an exact delivered figure rather than a marketing number — the field is wide open.
And since closest-guess wins if nobody hits it exactly, a defensible physical estimate beats a meme number every time.
One number. One hashtag. A year to wait. And 121,000 people who already blew it.
