The average selling price was calculated by combining survey results on the model, size and number of bands respondents purchased.
Extra weight was given to the responses of women, who are underrepresented in Wristly's panel, and the firm excluded responses from buyers of the watch in its first eight weeks on the market, finding they spent more than later shoppers.
The survey revealed men spend $30 more on the watch than women, who opt for the less expensive smaller size. Accessories can add considerably to the bill, with 40 percent of customers springing for a spare band as of August.
Wristly's research comes with a few caveats: The results only reflect buyers in North America, Europe and Oceania, and the panel skews to the wealthy.
But the company's findings track closely with figures Apple has disclosed about how much owners wear the watch. And Apple Chief Executive Officer Tim Cook has publicly cited the firm's findings about the Apple Watch's high rates of customer satisfaction.
Investors have grappled with a lack of information about the Apple Watch since its debut. Apple lumped sales of the watch in with figures for products such as the iPod and Beats headphones.