Remove the water difference
Dry matter is 100 minus moisture. A nutrient’s dry-matter percentage is its as-fed percentage divided by dry matter, multiplied by 100.
Dog + cat food nutrition normaliser
Dry matter basis calculator for pet food.
Enter only values printed on the packs. The tool converts as-fed percentages to dry matter and grams per 1,000 kcal. US AAFCO sources provide label-field context; the 2025 FEDIAF guideline documents the comparison bases. The calculator does not apply nutrient targets, diagnose a condition or choose a food.
Your two-label workspace
Missing values stay missing
All calculations happen in your browser. Inputs are not saved or sent to HungryPets.
Food A
Add moisture to calculate dry matter.
ConstituentAs fed %Dry matter %g / 1,000 kcal
Crude protein———
Crude oils & fats———
Crude fibre———
Crude ash———
Food B
Add moisture to calculate dry matter.
ConstituentAs fed %Dry matter %g / 1,000 kcal
Crude protein———
Crude oils & fats———
Crude fibre———
Crude ash———
These are unit conversions, not nutrient targets or a suitability score. Missing label values stay missing.
Account for calorie density
Grams per 1,000 kcal equals grams per 100g divided by kcal per 100g, multiplied by 1,000.
Compare; do not prescribe
A normalised difference can help frame a question. It does not establish digestibility, bioavailability, adequacy or suitability for an individual animal.
Method sources
The maths is visible; recommendations are not imported
AAFCO Reading Labels
Explains guaranteed analysis, nutritional adequacy, calorie statements and other US label fields. It is context for the entered values, not a suitability verdict.
AAFCO label guide ↗FEDIAF Nutritional Guidelines
The guideline presents nutrient information per 100g dry matter and per 1,000 kcal. Publisher rights apply; checked 8 August 2026 and referenced without reproducing recommendation tables.
2025 guideline page ↗Food Standards Agency pet-food guidance
OGL 3 unless otherwise stated. Explains UK pet-food labelling and ingredient categories; kept separate from US field rules.
GOV.UK ↗Limits
Use values on the same unit basis. Manufacturer energy values may use different methods. Therapeutic diets, disease, growth, pregnancy, symptoms or persistent feeding problems need a veterinarian or qualified veterinary nutrition professional.