Intake is calculated, the limit comes from your vet
Enter the sodium and phosphorus percentages printed on the bag and the ounces fed each day and the tool returns milligrams per day. Ounces convert to grams at 28.3495, then the percentage is divided by 100, multiplied by the grams fed and by 1,000, and the applied formula is printed with the result. Add the daily ceiling your veterinarian set and you also see how much room is left or by how much it is exceeded.
Why no limit is suggested here
Sodium and phosphorus restriction in kidney and heart disease depends on the condition, its stage and bloodwork, so it is a prescription decision. There is no single authoritative ceiling table, so this tool does not offer a number. The guaranteed analysis format follows the labeling framework used by AAFCO, and the ceiling used is only the one your veterinarian supplied. Information here is current as of October 2026.
Label values are often guarantees rather than exact amounts, and treats, supplements and drinking water are not included in the total. This tool is for reference only and does not replace veterinary care. Contact your veterinarian right away if you notice symptoms or suspect a problem.
Frequently asked questions
Leave that field blank and the tool shows intake only. Bring the number to your veterinarian and enter the ceiling they give you.
Yes. Enter the printed percentages and the ounces actually fed. Keep in mind that moisture differences change intake a lot per ounce.
No. If a treat lists its own percentages, run the tool again with the treat ounces and add the two results yourself.