Reptile Feeding & Care Calculators

This free reptile feeding calculator site turns your pet’s weight and age into clear numbers: prey size, insect counts, supplement days and growth ranges, all traced to veterinary sources.

Popular tools

Snake Feeding Calculator

Prey size and feeding schedule from your snake’s weight.

  • Ball Python
  • Corn Snake
  • Hognose Snake

Lizard Insect Feeding Calculator

How many insects per feeding, how often, and what to buy each week.

  • Bearded Dragon
  • Leopard Gecko
  • Blue Tongue Skink

Calcium & Vitamin Schedule Generator

A printable 7-day calcium, D3 and multivitamin dusting schedule.

  • Bearded Dragon
  • Leopard Gecko
  • Crested Gecko

Browse by species

A bearded dragon standing on sand with its head raised

Bearded Dragon

Care calculators & charts

A wild-type leopard gecko walking on sand

Leopard Gecko

Care calculators & charts

A normal-colored ball python coiled on aspen bedding

Ball Python

Care calculators & charts

An orange corn snake resting its head on a branch among leaves

Corn Snake

Care calculators & charts

A western hognose snake crawling across pale sand

Hognose Snake

Care calculators & charts

A crested gecko with a cream crest and dark sides resting on a keeper's open hand

Crested Gecko

Care calculators & charts

A northern blue-tongued skink on a sofa next to its food bowl

Blue Tongue Skink

Care calculators & charts

Why you can trust these numbers

  • Vet and academic sources. Every value comes from veterinary organizations, veterinary hospitals or published research. See our sources.
  • Free, no sign-up. Every reptile care calculator runs in your browser. Nothing to install and no account needed.
  • Regularly reviewed. We re-check the data every quarter and show the last update date on every page.

How to use HerpMath

Start with a scale. A digital kitchen scale that reads in grams is the most useful tool a reptile keeper can own, because nearly every feeding decision depends on weight. Weigh your pet, then pick a calculator: the snake feeding calculator for ball pythons, corn snakes and hognose snakes, or the insect feeding calculator for bearded dragons, leopard geckos and blue tongue skinks.

Each result comes with a short explanation, the rule behind it and a reference table, so you can see exactly where the number comes from. Results are estimates for healthy animals. If your reptile is not eating, is losing weight or looks unwell, a reptile veterinarian is the right next step.

Recently updated

EN