World’s First Calculator Watch, the HP-01 (Sep, 1977)

Besides being first, this is one of the coolest calculator watches I’ve ever heard of. You could actually use the time and date as variables in your calculations and it would continuously update the values based on the stopwatch or timer.

Hewlett-Packard advances in measurement and computation

The HP-01: a new kind of “time machine” you wear on your wrist.

New tools sometimes demonstrate their full significance only after people have invented a new range of uses for them. Their existence precedes their “reason” for existence. The HP-01 may be such a tool. It results from a timely fusion of two Hewlett-Packard technologies—precision time measurement1 and computation—and interrelates timekeeping with a computing element for the first time in a wrist-sized instrument.

Any resemblance between the HP-01 and a watch/ calculator stops inside the case. What makes the HP-01 a new kind of “time machine” is that it can compute time data to produce numerical perspectives in time. For example:

It displays hours, minutes, and seconds in 12- or 24-hour formats. Adds and subtracts time intervals from present time, and lets you use time intervals or segments in arithmetic manipulations.

It times by increments of .01 seconds from 00:00.00 to 99:59:59. You can take cumulative splits (freeze an exact time in the display as the stopwatch continues to run) as often as desired. It starts backwards from any nonzero time up to 99:59:59, counts down to zero, sounds an alarm, and counts forward as described above. (A second, separate alarm can be set to sound anytime during a 24-hour day). You can make continuously updated arithmetical calculations using the stopwatch or timer.

It displays the current day, month, year (or month, day, year). Preprogrammed 200-year calendar allows the HP-01 to find the number of days between dates, or any date given any other date and number of days, or the day of the week or year.

It computes. Whether interactively or not, it adds, subtracts, multiplies, divides; performs chain, mixed chain, serial, and mixed serial calculations; finds percentages, changes signs. Computes to 11-digit accuracy and rounds the display to seven digits. Automatically switches to scientific notation when the answer is equal to or greater than 10^7 or less than 10^-4, with a range of 1×10^-99 to 9.999×10^99. Lets you store data and recall it for further computation in memory. You can, for instance, keep a numeric quantity in continuous memory.

Admittedly not everyone’s cup of tea, the HP-01 offers fascinating ways to compute and keep track of numbers in the time domain. For example, you can compute and then count down the time it takes for a command to reach a spacecraft several hundred million miles away. The HP-01 can alternately show you the time remaining until the message is received, displayed to seconds or hundredths of seconds, and the distance the radio waves have yet to travel, updated each second. When the message arrives (T zero) the HP-01’s alarm sounds automatically.

Because only a relatively small number of these instruments will be made, we suggest you start your own discovery process by mailing the coupon now. Call 800-648-4711 in the U.S.A. (in Nevada, call 323-2704 collect) for the name of the HP-01 retailer nearest you.

The HP-01 with accessories costs $650* in stainless steel, or $750* with gold-filled case and gold-plated band. With its 200-year calendar, it not only bridges the generation gap, but represents a legacy of sorts.

*HP cesium beam frequency and time standards keep time with an accuracy equivalent to a 1-second error in 4500 years. They are used for calibration at observatories and at national centers for measurement standards throughout the world. The HP-01 is calibrated against this standard, though obviously it does not possess the same degree of accuracy.

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  2. MrG says: September 14, 20084:27 pm

    I used to work at the Corvallis HP plant, where the HP-01 was built. It was long out of
    production when I was there, but those who had one regarded it as a prestige item.
    There was sort of a standing joke that when people took it off their wrist, they walked
    leaning to the other side — it was kind of a hefty item.

  3. erwin says: November 11, 200811:15 pm

    do you guys where i can find this watch… thx

  4. oze says: March 4, 20093:43 pm

    i want to sell it
    email me : [email protected]

  5. uli says: October 17, 20096:46 am

    visit for the whole story about the hp-01. More than 100 pages of information and high quality pictures of hp-01 watches. All models including the rare prototypes and even the HP-02 LED watch is there!

  6. Jim Saenz says: April 16, 20114:50 am

    As a teenager I would visit my father. He had a Silver HP-01 and he would let me wear it. I loved that watch and as we got older I would say ” remember the HP, loved wearing that watch. About 4 years ago I met him for lunch on my birthday. He handed me a brown paper bag and in it was a HP-01 complete with the box, guide book and born date May 1977. It is my most treasured watch in my watch collection.

  7. […] the very first digital watch, which in turn evolved into the very snazzy and of course desirable calculator wristwatch ! However these were little more than a novelty really. However, new applications of wearable […]

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