
Japan is well known for both its love and skill of robots. Free of the terminator-induced prejudices of western cultures, they have blazed the way for robotic tour guides, waitresses, fish, singers, hairdressers, waste baskets, cyclists, rock-paper-scissors players, cockroaches, butts…
With so many robots, it’s hard to come up with an original one. But they are still out there. Tokyo University’s Center for the Study of Robotics came up with Denta-kun, the calculator using robot. Just to make it clear, the robot does not calculate. It just uses a calculator.
The name is derived from the Japanese word dentaku (calculator) and uses the suffix kun, which is kind of like Mr. but much less formal and often used with children. Kind of like if you say, “hey mister turtle!”
A video demonstration was made and uploaded to video sharing site NicoNico, but it can be a little confusing so a brief explanation is needed.
The video opens with someone coming across Sorobon, which is an abacus using robot. Ignoring the ironic subtext of Sorobon, they are inspired to take it to the next level by making a calculator-using robot.
First they craft the parts needed and assemble the robot. Next they design and build its circuitry, and when it’s all together they dub it Denta-kun.
Initial testing was rough, with Denta-kun flailing about wildly and producing wrong answers. However the bugs were soon smoothed out and Denta-kun was punching buttons like a pro.
The next step was to convert it from a completely pointless robot to a mildly useful one by replacing the keyboard input with a voice command system. With improved speed as well, Denta-kun could finally take verbal calculations and quickly provide answers.
Now enjoy the show.
I had a lot of fun questioning the purpose of Denta-kun, but in reality this cute little robot could potentially improve my quality of life greatly.
You see, I suffer from a condition called left-handedness. It’s a disease which afflicts nearly ten percent of the population, including Barack Obama and Luke Skywalker. As a result, I cannot use the number pad on the right side of my keyboard. Check it out. Cobwebs are forming on it.
If Denta-kun could be modified to fit onto a keyboard, then I wouldn’t be mocked for my disability anymore. No sir, no more mocking for me with my yellow rubber glove robot hand punching number keys.
Source: NicoNico (Japanese)


Rakuten’s Tokyo robot delivery service both is and isn’t what it promised, but is cute either way
Studio Ghibli adds new Jiji’s baby plush toy to its anime merchandise range in Japan
Beautiful off-the-beaten-path spot near samurai castle in rural Japan looks like a Monet painting
Tokyo sweets store has a “350% Pudding Soft Serve”, and people are going wild for it
Japanese figure skating star Yuzuru Hanyu and Winne-the-Pooh announce crossover merch line [Pics]
Wagyu ramen for foreign tourists appears in Kabukicho, with a very high price tag
Shinto shrine in downtown Tokyo announces cosplay ban
This awesome Japanese arcade chain has crane game coaches to help you win prizes
Studio Ghibli releases new Kiki’s Delivery Service Jiji music box for anime fans
McDonald’s Japan’s new Chiikawa Happy Meal figures are here![Photos]
Stray cats almost became classified as an invasive species in Japan but the change was overturned
Japanese toilet aims to attract foreign tourists but not everybody is happy about it
New Japanese vending machine at Shinkansen station sells cups of ice on platform
Anime fan in Japan arrested for ordering and cancelling over 4.3 billion yen in anime merch
Starbucks Japan teams up with Traveler’s Company for new stationery and goods collection
Pokémon Center Online designates first Pokémon items that will require Japanese ID card to buy
Beautiful Totoro bonsai figure needs no watering, makes soothing rain showers whenever you want
Japan’s new beer glass is designed to force you to drink…water [Video]
End of a manga era as Weekly Shonen Jump’s circulation drops under one million
Kochia calling: Right now is a great off-season season to visit this beautiful Japanese park
This beautiful rural Japan river is a great alternative to touristy summer retreats [Photos]
Tokyo subway installing new ticket gates that don’t accept payment through Suica or other IC cards
Japan now has human refrigerators inspired by Japanese vending machines
Hatsune Miku collaborates with Hokusai’s art in new Vocaloid ukiyo-e illustration series [Pics]
New Shinkansen luggage drop-off system begins in Japan, making train travel even easier
Studio Ghibli releases anime T-shirts that pay homage to one of Hayao Miyazaki’s most personal films
Air-conditioned dress shirts arrive in Japan to save working professionals from sweltering heat
Japanese Shinkansen becomes an overnight hotel for three nights this summer
Cup Noodle unveils first-ever cold-water instant ramen in Japan
99-year-old woman rescued while attempting to climb Mt. Fuji
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】