About

PawMathCalc is a small collection of free calculators for pet owners: age, food, growth, pregnancy, safety and habitat size. We built it because most pet calculators online are slow, cluttered, or hide the math. Ours load instantly, work on any phone, and always show the formula.

How the calculators work

Every result is calculated in your browser from published veterinary formulas and reference values (for example the resting energy requirement used by vets to plan feeding, or the toxic doses listed in the Merck Veterinary Manual). Each page shows the formula and its sources. Nothing you type is sent to a server.

Accuracy

Results are estimates. Every animal is different: breed, health, age and activity change the right answer. Our calculators do not replace your veterinarian. If your pet may have eaten something toxic, call your vet, the ASPCA Animal Poison Control Center at (888) 426-4435 or the Pet Poison Helpline at (855) 764-7661 right away.

Who is behind it

PawMathCalc is a small independent project that builds simple, useful web tools.

Questions or suggestions for a new calculator? Visit the contact page.