The ball python feeding calculator determines the correct prey weight range and feeding frequency for your ball python. The standard rule is 10–15% of the snake's body weight per feeding, with frequency adjusted for age and metabolic rate.
Ball Python Feeding Calculator
Rodent Size Guide
Feeding Tips
How to Use the Ball Python Feeding Calculator
Ball pythons are one of the most popular pet snakes but are prone to obesity in captivity due to their docile, sedentary nature and owners feeding too large or too frequently. Precise portion sizing prevents the metabolic issues that shorten lifespan.
Step 1: Weigh Your Snake
Use a digital kitchen scale for accurate weight measurement. Weigh before feeding for consistency. Track weight monthly — healthy adults should maintain stable weight with slight fluctuation. Consistent weight gain above 5% monthly in adults indicates overfeeding.
Step 2: Calculate Prey Weight
Prey should be 10–15% of the snake's body weight. A 500g snake needs prey weighing 50–75g (roughly a medium mouse or rat pup). The 10% end is appropriate for already-overweight snakes; 15% for growing juveniles or snakes at ideal weight. Never exceed 20% as this dramatically increases regurgitation risk.
Step 3: Set the Right Frequency
Ball pythons have slow metabolisms. Hatchlings are fed every 5 days while their growth rate is fastest. Juveniles every 7 days. Adults every 2–3 weeks. Many experienced keepers put adults on a monthly schedule with slightly larger prey — this mimics natural wild feeding patterns and reduces obesity risk. Monitor body condition: you should be able to feel (but not prominently see) the spine with slight pressure.
FAQ
How big should the prey item be for a ball python?
Prey items should be approximately 10–15% of the snake's body weight. The visible lump after feeding should not cause significant distortion along the snake's sides. As a visual check, the prey should be roughly the same width as or slightly wider than the snake at its widest point.
How often should I feed my ball python?
Hatchlings and juveniles (under 1 year) are fed every 5–7 days. Young adults (1–3 years) are fed every 7–10 days. Adults over 3 years are typically fed every 14–21 days. Ball pythons have notoriously slow metabolisms and overfeeding leads to obesity, which shortens lifespan.
Should I feed my ball python live or frozen/thawed prey?
Frozen/thawed (F/T) rodents are strongly recommended. Live prey can injure or kill a snake — even a mouse can bite and cause serious injury to a docile ball python. F/T is also more convenient and lower risk. Most hatchlings can be converted to F/T prey early with persistence.
My ball python hasn't eaten in weeks — is that normal?
Ball pythons are notorious for feeding strikes lasting weeks to months. Breeding season (October–March) commonly triggers refusal in adults. Shedding typically causes 1–2 week refusal. As long as weight is stable and the snake shows no symptoms of illness, short-term refusal is usually not an emergency. Juveniles should not skip more than 2–3 meals without investigation.
What size mouse or rat should I buy?
For hatchlings, use pinky mice or fuzzy mice. For juveniles, small mice or rat pups. Adults typically eat adult mice or small to medium rats. Calculate the prey weight as 10–15% of snake body weight, then match to the appropriate rodent size category at your pet store.
Can I feed my ball python large prey to reduce feeding frequency?
No — increasing prey size beyond 15% body weight to extend intervals is not recommended. Oversized prey increases regurgitation risk, stresses the digestive system, and may cause obesity over time. Stick to the 10–15% rule and adjust frequency instead.