Reptile Feeder Size Calculator
Correct feeder insect or rodent size for your reptile — under-sized wastes energy, over-sized risks impaction.
Reptile Feeder Sizing & Nutritional Guide
Determine the safe prey size to avoid lethal impaction or regurgitation, plus nutritional profiles.
Recommended Feeder Size
1/2" to 3/4" Crickets, Medium Dubias (1/2"), Medium BSFL, Small Hornworms
Maximum Safe Limit: 0.75" (19 mm)
Dubia Roaches
1:3 (Good) Ca:P
Crude Protein
21.4%
Crude Fat
6.1%
Best Suited For
Bearded dragons, Geckos, Skinks, Chameleons
Dusting Rule
Calcium 4x/wk
Top staple insect! High meat-to-shell ratio, easy to digest, cannot climb smooth plastic.
Not medical advice. This tool provides general guidance based on common veterinary formulas. Always consult your veterinarian for medical decisions about your pet.
How it works
We use the anatomical golden rule: for insectivores, the feeder length should never exceed the width between the reptile's eyes; for carnivorous snakes, prey girth should equal 1.0× to 1.25× the widest part of the snake's body (or 10-15% of body weight for juveniles).
Examples
- 6-month bearded dragonMedium crickets or small dubias
- Adult ball pythonSmall–medium rat