The most expensive calculator in the world: Casio introduces a $624 model

Casio has unveiled the S100X—a calculator that costs more than many premium gadgets and looks like a miniature Japanese lacquer box. The model is released in a limited run of just 650 units, each of which was handcrafted over nearly a month. The price in Japan is 99,000 yen (about $624), making it the most expensive mass-produced calculator in history.

Why it costs so much
At first glance, the S100X is not just a calculator but a true art object. The body is fully milled from aluminum and coated with traditional Japanese urushi lacquer—the same technique used for high-end boxes, tableware, and decorative items. The deep glossy black finish with warm red accents is applied by hand by craftsman Ryuji Umeda from Yamakyu Shitsuki, a company that has practiced this craft since 1930. Each unit takes about a month to complete, with layers of lacquer applied, sanded, and polished one by one.

Inside is a classic 12-digit segmented blue LCD display, intentionally designed to resemble fountain pen ink. The functionality is simple but practical: standard calculations, a currency converter, and a tax calculator. It is powered by a built-in solar panel and a single button-cell battery, which can last up to seven years with about an hour of daily use.

Who this device is for
The S100X is not about computation. It is a collector’s item for those who appreciate Japanese craftsmanship, minimalism, and attention to detail. Casio deliberately made it limited—just 650 units worldwide, each with subtle variations from the hand-applied lacquer. It is currently available only in Japan, with no plans for international release, and will most likely sell out quickly among collectors and enthusiasts of rare electronics.

For comparison, the most expensive calculators before this typically cost around $300–400 and were simply gold-plated or decorated. The S100X represents a different level entirely—not just a gadget, but a work of art that happens to perform calculations.

In brief
The Casio S100X is the most expensive mass-produced calculator in the world (99,000 yen ≈ $624). Its aluminum body is coated with hand-applied Japanese urushi lacquer, with each unit taking about a month to complete. Only 650 units are being produced. Inside is a standard 12-digit display with currency and tax functions, powered by solar energy and a battery that lasts up to seven years. It is not about functionality, but about collectible value and traditional Japanese craftsmanship.