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Nutrient Calculators

Tools for understanding specific nutrients in your pet’s food — starting with protein, using authoritative AAFCO reference standards rather than invented targets.

Dog Protein Calculator

Convert your dog food’s label protein percentage to a dry-matter basis and see it against AAFCO’s published minimum standards.

Dog Protein Requirements (guide)

Understand what crude protein means, how to convert it to a dry-matter basis, and how AAFCO’s published minimums compare for adult dogs and puppies.

Cat Protein Calculator

Convert your cat food’s label protein percentage to a dry-matter basis and compare it against AAFCO’s published minimum standards for cats.

Cat Protein Requirements (guide)

Understand what crude protein means, how to convert it to a dry-matter basis, and how AAFCO’s published minimums compare for adult cats and kittens.

Calcium:Phosphorus Ratio Calculator

Calculate the Ca:P ratio from your pet food’s calcium and phosphorus percentages, with AAFCO reference context for dogs and cats.

Calcium to Phosphorus Ratio Guide

Learn what the Ca:P ratio means, why both minerals must be compared on the same basis, and why the ratio alone cannot show a diet is complete or right for a growing puppy.

More nutrient-specific calculators and guides will be added to this hub over time.

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PawCalcHub

Pet nutrition calculators

About PawCalcHub

PawCalcHub is a free collection of feeding and nutrition calculators for dogs and cats. We help pet parents estimate daily calories, portion sizes, water needs and pet food label values in plain language.

Every tool shows the formula it uses and the veterinary references behind it, so you can check the numbers and discuss them with your vet.

Dog Nutrition

  • Dog Food Calculator
  • Dog Calorie Calculator
  • Dog Feeding Guide
  • Puppy Feeding Calculator
  • Dog Weight Loss Calculator
  • All dog tools →

Cat Nutrition

  • Cat Food Calculator
  • Cat Calorie Calculator
  • Kitten Feeding Calculator
  • Cat Water Intake Calculator
  • All cat tools →

Pet Food Analysis

  • Dry Matter Calculator
  • Pet Food Carb Calculator
  • Calorie Density Calculator
  • Calcium-to-Phosphorus Calculator

Results are educational estimates, not veterinary advice, diagnosis or treatment. Always consult your veterinarian before changing your pet’s diet.

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