A Short History of the Pedometer

Counting steps feels like a distinctly modern habit — something invented alongside the smartphone, sold to us by an app. It's actually one of the older ideas in personal technology, with a design history that runs back further than the United States itself.

A Renaissance sketch, never built

The earliest known design for a step-counting device comes from Leonardo da Vinci, sometime in the late 1400s. Da Vinci's sketches show a gear-driven mechanism with a pendulum arm meant to swing with the motion of a walking leg, tripping a counter with each stride. He conceived it primarily as a military and mapmaking tool — a way to measure marching distances more precisely than pacing and guesswork allowed. There's no solid evidence the device was ever actually built in his lifetime; like a number of da Vinci's sketches, it stayed a design on paper.

Swiss watchmakers pick up the idea

The concept resurfaces properly in the 1770s, with Swiss horologist Abraham-Louis Perrelet, who built a mechanical pedometer using a weighted, oscillating mechanism similar to the self-winding watch technology he was independently developing. Around the same period, other continental watchmakers — including a Parisian craftsman whose work would later cross the Atlantic — began producing small pocket devices that used a lever arm, tied by a cord to the leg, to advance a set of dials with every step.

Thomas Jefferson's walking watch

One of the more delightful footnotes in early American history: Thomas Jefferson owned and used a pedometer, commissioned from a Paris watchmaker during his time as U.S. minister to France in the 1780s. Worn in a vest pocket with a string running down to a strap below the knee, it pulled a lever with every step and advanced a set of gears. Jefferson used it to measure the walking distance to landmarks around Paris, and reportedly continued using pedometers later at Monticello. He never patented the design or any modification to it, but for a period, some Americans reportedly nicknamed the devices "Tomish meters" in his honor.

From novelty to patent

Pedometers remained a niche, mostly mechanical curiosity through the 1800s and into the early 1900s — used by surveyors, military officers, and the occasional health-conscious eccentric, but not mass-marketed to the public. That changed gradually: a British inventor named John Harwood received the first formal pedometer patent in 1924, and by the 1930s, American radio was in on the trend — a promotional device called the "Hike-o-Meter" was distributed as a premium tied to the popular Jack Armstrong, the All-American Boy radio show, putting mechanical step-counting into ordinary households for the first time at real scale.

Japan, 1965, and the number that stuck

The modern era of step-counting starts with the Manpo-kei, the "10,000 steps meter" released by Japan's Yamasa Clock company in 1965, built around research by Dr. Yoshiro Hatano into rising obesity rates. It's the direct ancestor of every default step goal built into a fitness app today — the moment step-counting shifted from a military or novelty tool into a specifically health-branded consumer product, with a round number attached that would outlive the device itself by six decades.

The accelerometer era

Mechanical, lever-and-gear pedometers persisted right up until the 2000s, when cheap digital accelerometers — the same chips that let a phone know which way is up — made electronic step counting small and inexpensive enough to embed in ordinary consumer devices. Fitbit's launch in 2008 is generally credited as the moment step-counting went fully digital and fully mainstream, kicking off the wearables category that eventually put an accelerometer in the pocket, on the wrist, or on the finger of a meaningful share of the world's population — all of them, whether they know it or not, running on a five-hundred-year-old idea da Vinci never got around to building.

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