Weight Watchers International Inc. raised its 2015 earnings outlook as the company also posted better-than-expected second-quarter earnings, sending its shares higher.

Shares rose 16% to $5.16 in recent after-hours trading.

For the year, the company raised its per-share earnings estimate to 57 cents to 72 cents, from its previous estimate for per-share profit of 40 cents to 70 cents.

"In the second quarter, our member recruitment trends improved, particularly in North America where online sign-ups were positive year-over-year," and Chief Executive Jim Chambers said in prepared remarks Wednesday. "Late this year, we will be launching a significant and comprehensive program innovation in all of our major markets that we believe will return the company to recruitment growth."

In recent years, Weight Watchers has struggled to recruit and retain paying members, and it has been shedding members and losing ground to apps and other gadgets that track calories.

In the latest quarter, the company's total paid weeks fell 17.6% from a year earlier, including a decline in its online business of 18.4% and a drop of 16.5% in its meetings business. However, the company said the trend was an improvement from the first quarter, when total paid weeks fell 18.9%, including a drop of 21.4% online and nearly 15.7% in its meetings segment.

Overall, Weight Watchers reported a profit of $27.9 million, or 49 cents a share, down from $54 million, or 95 cents a share, a year earlier. Excluding early-debt extinguishment impacts and other items, per-share earnings fell to 42 cents from 98 cents. Revenue decreased 22% to $309.8 million. Excluding currency impacts, revenue fell nearly 17%.

Analysts polled by Thomson Reuters expected per-share profit of 40 cents and revenue of $312 million.

Write to Tess Stynes at tess.stynes@wsj.com

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