The device's enduring reliability equates to millions of sales each year for Japan's Casio, which is even eyeing expansion in certain regions.
Despite lightning-speed advances in artificial intelligence, chatbots still sometimes stumble on basic addition.
In contrast, "calculators always give the correct answer," Casio executive Tomoaki Sato told AFP.
But he conceded that calculators could one day go the way of the abacus.
"It's undeniable that the market for personal calculators used in business is on a downward trend," Sato said in Tokyo.
Smartphones and web browsers can handle everyday sums, while AI models achieved gold-level scores for the first time this year at a prestigious global maths contest.
But calculators are more affordable than phones, and run on batteries and solar power -- a plus for schools in developing countries, a potential growth area for Casio, Sato said.
And people who do buy calculators prefer the way they feel, he argued.
Thitinan Suntisubpool, co-owner of a shop selling red bags and beckoning cats in Bangkok's Chinatown, said she loves how durable her big calculator is, having dropped it several times.
"It's more convenient in many ways," the 58-year-old told AFP.
"We can use it to press the numbers and show the customer," avoiding language-barrier misunderstandings.
But at a nearby street stall selling clocks, torches and calculators, the vendor, who gave her name as Da, said calculator sales were "quiet".
- 'Optimised tools' -
At a Casio factory in Thailand, assembly line workers slotted green circuit boards into place and popped cuboid buttons labelled "DEL" from a plastic tub onto pastel-blue calculator frames.
"Calculators are still in demand," said Ryohei Saito, a general manager for Casio in Thailand.
"Not everywhere in the world has smartphone connectivity, and calculators are optimised tools focused on necessary functions," he said.
In the year to March 2025, Casio sold 39 million calculators, general and scientific, in around 100 countries.
That compares to 45 million in 2019-20, but is still up from the 31 million that sold the following year after the Covid-19 pandemic hit.
The company has come a long way from the 1957 invention of the desk-sized "14-A", which it says was the first compact all-electric calculator.
Calculator history even made headlines recently when Christie's suspended the Paris sale of an early calculating machine, "La Pascaline", after a court said it could not be taken abroad.
The auction house called the ebony-decorated 1642 device "the first attempt in history to substitute the human mind with a machine".
Those attempts have accelerated with AI.
- Scoring gold -
In July, AI models made by Google, OpenAI and DeepSeek reached gold-level scores at the annual International Mathematical Olympiad (IMO).
But neither attained full marks at the annual contest for under-20s, unlike five human participants who achieved perfect scores.
IMO president Gregor Dolinar called the progress of artificial intelligence in the field "fascinating".
"When we talk about scientific calculators, in the past you needed them, but nowadays it's easier to just ask AI," he told AFP.
"If you pose the question in the right way," artificial intelligence can crunch abstract, logical questions and show how it reached its conclusion, Dolinar said.
Dolinar, a professor in engineering at the University of Ljubljana, thinks physical calculators are likely to "slowly disappear".
Something that has already happened for his students.
"They can calculate everything on a phone," he said.
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