Ultimate pet health toolkit. Calculate dog and cat calories, body condition scores (BCS), and hydration needs. Professional tools for responsible pet owners and vets.
PetHealthCalc brings together five evidence-based tools that all draw on the same veterinary formulas, so 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 sits at, above, or below a healthy weight on the standard 1-to-9 scale, then feed that target into the daily food calculator, which converts it into grams of kibble using the Resting Energy Requirement formula RER = 70 x (body weight in kg) raised to the 0.75 power. The food-calorie tool reads the Guaranteed Analysis panel on any label and estimates Metabolizable Energy with the Modified Atwater factors (3.5 kcal/g for protein and carbohydrate, 8.5 kcal/g for fat); the hydration tool turns body weight into a daily water target of roughly 50-60 mL per kg; and the age converter translates calendar years into a realistic life stage. Used together over time, these tools let you replace guesswork with measurable trends: weigh your pet on a fixed day, log the result, and adjust portions in small steps rather than large ones. Every figure here is a planning estimate, not a diagnosis, and individual metabolism, illness, medication, and pregnancy can all shift true requirements, so treat each result as a starting point for a conversation with your veterinarian.
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.