Calculate dog and cat food portions, calories, ideal weight, and hydration needs for free. No login required, get evidence-based results in 3 seconds.
PetHealthCalc brings together free evidence-based tools that all draw on the same veterinary formulas. The numbers stay consistent as you move from one calculator to the next.
Start with the Body Condition Score (BCS) tool to judge whether your dog or cat is at a healthy weight. Then feed that target into the daily food calculator to get your pet's daily portion in grams in just 3 seconds.
Our food-calorie tool estimates Metabolizable Energy, the hydration tool gives a daily water target, and the age converter translates calendar years into a realistic life stage. Use them all for free, with no login required.
Combine regular veterinary checkups with at-home monitoring of their weight, body condition score (BCS), and daily calorie intake using professional calculators.
For adult pets, once a month is usually sufficient. For puppies, kittens, or pets on a weight management plan, once a week helps track progress more accurately.
Yes, they use standard veterinary formulas (RER/MER), but some breeds have unique metabolic rates. Use these results as a starting point and consult your vet.
Begin with the Body Condition Score tool to set a realistic target weight, then feed that weight into the daily food and hydration calculators so every portion and water target is anchored to the same goal.