Unfortunately, it is nearly impossible to find out for certain which gender your ball python is without popping or probing your pet.
Although there is a way of predicting whether an adult ball python is a male or a female by its size, this form of prediction is nowhere near perfectly accurate, as every ball python is different, and in combination with environmental factors, will grow to a unique size regardless of its gender. That being said, if you don’t feel comfortable popping your ball python yourself, if you don’t want to bother going to someone who knows how to do it, and if you just want to estimate, say because you don’t really care either way which gender your ball python is because you won’t be breeding your pet, predicting a ball python’s gender based on size might be a good option for you.
Since male ball pythons typically get to be between 3-4 feet long (91-122 cm), and female ball pythons normally grow to be between 4-5 feet (122-152 cm), if you have an adult ball python and it’s between 3-4 feet, you’re more likely to have a male than a female, and if your ball python is between 4-5 feet, your python is more likely to be female than male. Of course this method of prediction is not anywhere near accurate because many variables apply to the length of a ball python: how well it’s been fed in the past, how its genetics play out, how big its meals are, etc., but if you only want an estimate, measuring its size is a decent way to guess.