It can get up to 6 ft. wide. i found that out on animal planet (river monsters). On river mosters he cuaght i sting ray that's was 6 ft. wide, 400 pounds, and when he had it in the net she had three baby sting rays. I hope this was the answer you were looking for.
3 feet
Stingray - 1964 The Big Gun 1-17 is rated/received certificates of: Australia:G
The largest stingray, the short-tail stingray, can grow upwards of 2.1 m (6.9 ft) across. The pelagic stingray, which is one of the more common stingrays, can reach widths of 56 cm (23 in) in length when fully grown.
One of the advantages of stingray development is their nocturnal behavior. Stingrays forage for food at night and avoid predators by burying themselves in substrates.
Depending on the breed of a stingray, adults can vary from the size of a palm to having a body of six feet in diameter, with a tail length of fourteen feet. Adolescent stingrays will change in size as they grow older starting from hatching as an embryo of the size of your thumbnail. They are held in their mother's womb until they are mature enough to survive on their own.
The Amazonian Alpha sting ray, is the largest sting ray in the world. It averages at 75 feet and 2,554 pounds
6 feet across 14 feet long including its tail
A stingray is born alive, a fully developed but much smaller version of an adult. The mother holds the eggs inside of her while the babies develop and hatch, but is not connected to them through a placenta, as mammals are.
Well petco said 180 gallon but I don't really think it needs to be that big
A Stingray.
Stingray - 1964 Stingray 1-1 is rated/received certificates of: Australia:G
The wingspan of a stingray can vary depending on the species, but it typically ranges from 1-6 feet. The largest stingrays, such as the Manta ray, can have wingspans of up to 23 feet.