Food Finder

Cat food phosphorus, made comparable.

Every food converted to mg of phosphorus per 100 kcal and dry matter basis, so wet and dry foods can be compared fairly. Each entry shows where its numbers came from and when we last checked.

Showing 21 of 21 foods · sorted by mg phosphorus per 100 kcal

Cat foods with phosphorus per 100 kcal and dry matter basis
	Format
Renal Support D Thin Slices in Gravy Wet Cat FoodRoyal Canin Veterinary Diet · Rx	Wet · chunks / shreds	80	0.36%	30.5%
Renal Support E Loaf in Sauce Wet Cat FoodRoyal Canin Veterinary Diet · Rx	Wet · pâté	90	0.37%	29.1%
Renal Support S Dry Cat FoodRoyal Canin Veterinary Diet · Rx	Dry kibble	100	0.43%	25.0%
Renal Support T Thin Slices in Gravy Wet Cat FoodRoyal Canin Veterinary Diet · Rx	Wet · chunks / shreds	100	0.41%	27.4%
K+M Kidney + Mobility Support Canned Cat FoodBlue Buffalo Natural Veterinary Diet · Rx	Wet · pâté	110	0.47%	25.6%
Renal Support A Dry Cat FoodRoyal Canin Veterinary Diet · Rx	Dry kibble	110	0.44%	23.4%
Renal Support F Dry Cat FoodRoyal Canin Veterinary Diet · Rx	Dry kibble	110	0.45%	26.4%
Renal Support + Hydrolyzed Protein Dry Cat FoodRoyal Canin Veterinary Diet · Rx	Dry kibble	110	0.46%	26.5%
NF Kidney Function Advanced Care Feline Formula Wet Pate Cat FoodPurina Pro Plan Veterinary Diets · Rx	Wet · pâté	114	0.52%	26.1%
k/d Pâté with Chicken Cat FoodHill's Prescription Diet · Rx	Wet · pâté	116	0.50%	29.0%
NF Kidney Function Advanced Care Feline Formula Dry Cat FoodPurina Pro Plan Veterinary Diets · Rx	Dry kibble	116	0.50%	30.1%
k/d with Ocean Fish Cat FoodHill's Prescription Diet · Rx	Dry kibble	118	0.51%	29.3%
k/d Chicken & Vegetable Stew Cat FoodHill's Prescription Diet · Rx	Wet · chunks / shreds	118	0.52%	29.8%
k/d Vegetable & Tuna Stew Cat FoodHill's Prescription Diet · Rx	Wet · chunks / shreds	118	0.52%	29.4%
k/d Pâté with Tuna Cat FoodHill's Prescription Diet · Rx	Wet · pâté	119	0.52%	29.0%
Renal Support Early Consult Loaf in Sauce Wet Cat FoodRoyal Canin Veterinary Diet · Rx	Wet · pâté	120	0.44%	31.0%
k/d + j/d Chicken Flavor Cat FoodHill's Prescription Diet · Rx	Dry kibble	124	0.54%	29.0%
k/d with Chicken Cat FoodHill's Prescription Diet · Rx	Dry kibble	125	0.54%	28.6%
K+M Kidney + Mobility Support Dry Cat FoodBlue Buffalo Natural Veterinary Diet · Rx	Dry kibble	130	0.55%	29.1%
Renal Support Early Consult Dry Cat FoodRoyal Canin Veterinary Diet · Rx	Dry kibble	130	0.50%	28.2%
NF Kidney Function Early Care Feline Formula Wet Pate Cat FoodPurina Pro Plan Veterinary Diets · Rx	Wet · pâté	206	0.91%	28.3%

Nutrition figures are for information only and come from the source shown. Formulas change, so check the current label. Many cats refuse renal diets; some vets suggest lower-phosphorus regular foods as an alternative. Always discuss diet changes with your vet, and never stop a prescription diet without their guidance.

Read our full medical disclaimer.

DMB vs. mg per 100 kcal: which number matters?

A can of pâté is about three-quarters water. A bag of kibble is about one-tenth water. So when a wet-food label says 0.25% phosphorus and a kibble label says 1.0%, the numbers can’t be compared directly.

Dry matter basis takes the water out of the picture. It answers: “if this food were completely dry, how much of it would be phosphorus?” It’s the number most vets and labels talk about.

mg per 100 kcal goes one step further. Cats eat until they’ve had enough calories, not enough grams. A rich, high-fat food means your cat eats less of it, and so takes in less phosphorus. Many people in the feline CKD community find this the fairest way to compare foods, which is why we lead with it.

Neither number tells you what your cat should eat. That depends on their lab results, their appetite and your vet’s plan. Lower-phosphorus foods are often recommended for cats with CKD, and your vet can tell you what level suits your cat.

See foods ranked from lowest phosphorus →

How we calculate

US labels list nutrients as fed, including all the water. To compare foods fairly we convert them two ways:

Dry matter basis (DMB) = as-fed % ÷ (100 − moisture %) × 100. This removes water, so a pâté and a kibble can be compared.
mg per 100 kcal = as-fed % × 1,000,000 ÷ kcal per kg. Cats eat to meet their calorie needs, so this shows how much phosphorus comes with the energy they eat. We highlight this number.

Try it yourself with the dry matter calculator, or read how to read a cat food label. Spotted an error? Email 781960591@qq.com.

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Food Finder FAQ

What is a low phosphorus cat food?

There is no single accepted veterinary cut-off for calling a food “low phosphorus” for an individual cat with CKD, so KidneyPaw doesn’t label foods that way. We show each food’s phosphorus per 100 kcal, with its source, so you can compare. Many cats with CKD benefit from a vet-recommended renal diet; your vet can tell you what fits your cat.

Can I switch my cat from a prescription renal diet to a regular food?

Please talk with your vet first. Prescription renal diets are adjusted in several ways besides phosphorus. Many cats refuse renal diets, and some vets suggest lower-phosphorus regular foods as an alternative, but that is a decision to make together with your vet.

Why does a food say “phosphorus unknown”?

Many US labels don’t list phosphorus, or don’t list calories. Without both, we can’t calculate mg per 100 kcal. You can ask the manufacturer for the “typical analysis” of phosphorus and calories, which most will share by email.

Do affiliate links affect the rankings?

Never. The order and the phosphorus figures come only from the nutrition data. If we ever include retailer links, they are disclosed on the page and they never change the order.

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