How to use the pet prescription food mixing amount calculator
When a veterinarian asks you to mix a prescription or therapeutic diet with your usual food, the share is clear but the amount to put in each bowl is not. Enter the total daily amount, the share of prescription food you were directed to use and how many meals a day you feed. The calculator splits both foods per day and per meal in ounces. It does not propose a share of its own and does not help choose which prescription diet is appropriate.
The math multiplies the total by the share to get the prescription amount, assigns the remainder to the regular food and divides each by the number of meals. The mixing share is a prescribing decision that depends on the condition, lab results and the product itself, and no recognized ratio table exists, so the tool takes the share you were given rather than inventing one. A gradual transition that shifts the share over several days is widely used when changing foods, but that day by day table belongs to a food transition calculator. Figures are current as of October 2026.
The same weight can carry different calories from product to product, so this tool does not compute calories, and changing the prescribed share on your own can undo the purpose of the diet. Per meal amounts are shown to two decimals, which a kitchen scale handles better than a measuring cup. 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
This calculator does not decide it. The share is a prescribing decision that depends on the condition and lab results, so enter the figure your veterinarian gave you.
Yes. Enter 100 as the share and the regular food shows as 0 oz, leaving only the prescription amount per meal. Entering 0 calculates the regular food alone.
No. Equal weights of different products carry different calories, so check the stated energy content on each package. This tool only splits the weight.