How to use the newborn puppy and kitten weight gain target calculator
Puppies are reported to gain 5 to 10 percent of body weight per day through the first two weeks, and to reach double their birth weight within 10 to 14 days (at 5 percent a day, compounding, doubling takes about 14 days). The calculator uses those figures for the daily gain target and tomorrow target weight, and shows your average daily gain so far.
The daily target is current weight multiplied by the low and high gain rates. The check uses the average daily growth rate rather than average grams: weight compounds on the previous day, so the tool takes (current weight divided by birth weight) to the power of one over the age in days, minus one, and compares that with the low rate. Average gain per day is shown alongside for reference. Weights can be entered in ounces or grams. The gain rates are open input fields with the puppy figures of 5 and 10 as defaults. No verified gain rate exists for kittens, so enter the rate agreed with your veterinarian.
If weight has dropped, or the average daily growth rate sits under the low rate, the result says so, because stalled weight in the newborn period is a sign that can worsen fast. This calculator does not work out milk volume or supplemental feeding amounts. Figures reflect October 2026.
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
The 5 to 10 percent daily gain and doubling by day 10 to 14 are puppy guidance. For kittens, enter a rate agreed with your veterinarian.
Stalled or falling weight in the newborn period is reported as a sign that can worsen quickly. Do not wait - contact your veterinarian right away.
No. Supplemental feeding amounts depend on weight, age and condition, so they have to be set with your veterinarian.