
Intrigued individuals predict huge spike in Japanese toilet paper consumption.
Since there’s really no point in beating around the bush after a headline like that, let’s dive right into it. Earlier this week, Japanese Twitter account @urasahou sent out a method for evaluating the size of one’s manhood, both in length and girth, without having to use a ruler, tape measure, optical scanning, or any other customary measuring apparatuses.
Instead, all you need is a roll of toilet paper, specifically the paper core at the center.
男性器のサイズに関し、非常にわかりやすい資料を見つけたので共有させて頂きます。
— 裏垢のお作法 (@urasahou) January 27, 2018
自称巨根の方もこちらの基準を元に、今一度ご自身の息子さんを見直して頂くと「あいつ言うほどデカくもなかったわ」と言われにくくなるかもしれません。いかがでしたか? pic.twitter.com/8Jae07DQYc
“We found a chart with an extremely simple way to determine whether you have a big penis or not,” tweeted @urasahou, accompanied by the above photos of a penis-substitute sponge being inserted into the toilet paper core.
According to the criteria for length:
● Glans does not protrude from far end of core: Small size
● Two centimeters (0.8 inches) or less of glans protrudes from core: Average size
● Glans protrudes from core: Huge cock
● Entire glans protrudes from core: Irregularly large
And for girth:
● Plenty of room to spare inside the core: Small size
● Snug fit: Average size
● Cannot insert without tearing the core: Giant cock
@urasahou went on to clarify that the test criteria are for use with a standard consumer-sized roll of Japanese toilet paper, and that using a roll meant for commercial use or sale in overseas markets, which could have a different length or diameter, will skew the results. No specific mention of whether the penis is supposed to be erect or not is mentioned, but most such self-evaluations are designed for the member to be at attention.
As to why @urasahou is sharing this information, which has been retweeted tens of thousands of times, the initial charts were accompanied by the suggestion that “If you use this and reevaluate the size of your penis, it’s less likely that someone who sleeps with you will then tell other people ‘He didn’t turn out to be as big as he says he was.’” However, as some online commenters have pointed out, the test is ostensibly meant to be performed after using up all the paper on the roll, so maybe we shouldn’t entirely rule out the possibility that this is a secret marketing campaign by Japanese toilet paper manufacturers to boost consumption as men furiously spool off the paper remaining on the roll when they go home tonight in order to satisfy their curiosity.
Source: Twitter/@urasahou via Otakomu
Featured image: @Twitter/@urasahou
Top image: Pakutaso

Japanese Twitter user spends eight years stacking toilet paper cores, completes entire wall
Japanese arcade restroom asks customers to declare loyalty for dogs or cats in toilet paper poll
Old dog shows new trick with very Japanese solution to toilet paper wall challenge【Video】
Japanese Twitter laments phenomena of “middle-aged man indirect dick kissing” in public toilets
Studio Ghibli unveils new Rollbahn notebook in honour of Howl’s Moving Castle
Stunning central Japan wisteria festival is like a purple fantasy straight out of a Ghibli movie
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
Awesome Ghibli Howl’s Moving Castle figure is also a puzzle and an organizer[Photos]
Nine amazing off-the-beaten-path cherry blossom spots in Japan for yaezakura and shidarezakura
Studio Ghibli adds new anime tumblers to its cool streetwear brand in Japan
Studio Ghibli unveils new goods that tip the hat to The Cat Returns
Super-detailed cherry blossom forecast maps for 2025 show warm winter doesn’t mean early sakura
Foreign tourists outnumber Japanese ones at Kyoto hotels for first time ever
Tokyo government organizes food truck event to clear out delinquent/homeless teen gathering area
Train station platform ramen store closes its doors on half a century of history in Tokyo
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Cherry blossoms begin blooming in Japan with record-early starts for sakura season
Studio Ghibli adds new Mother’s Day gift sets to its anime collection in Japan
The next time you’re feeling stressed out, you could relax on a Pokémon Psyduck chair from Japan
When will the cherry blossoms reach full bloom in Japan this year?[Forecast]
7-Eleven Japan’s giant fried chicken skewer would be too big to eat, so it’s really for cuddling
Starbucks Japan unveils new sakura cherry blossom collection for hanami season 2026
Studio Ghibli releases Catbus pullback keychain that runs like the anime character
Nine great places to see spring flowers in Japan, as chosen by travelers (with almost no sakura)
Starbucks Japan releases first-ever Hinamatsuri Girls’ Day Frappuccino
Japan’s cherry blossom season predicted to start earlier than we’d thought, especially in Tokyo
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Japanese squat toilet plastic model kit: Weird, gross, or both?【Photos】