Weight & body condition

The vet said lose weight. Now what?

KibbleLab turns "cut back a little" into an exact number: a daily calorie target from published veterinary guidelines, portioned to the food your cat actually eats, tracked week by week.

Get your cat's number How we know

The plan

Goal weight: 26 lb
Daily target: 340 kcal
Portion: 1¾ cups

Down 5% · first milestone hit Next: 10%

An example plan. Yours is calculated from your cat's own weight, body condition, and the exact food in the bowl, with the math shown.

How it works

A number, not a guess.

Step 1

Set a healthy target

Enter a goal weight, or let KibbleLab estimate a first target from your cat's body condition score.

Step 2

Get the number and the portions

A daily calorie target, converted into cups or cans of the exact food in the bowl. We show the math, not a black box.

Step 3

Track and hit milestones

Log weigh-ins, watch the trend line, celebrate 5% and 10%, and reassess automatically at goal.

The math, in the open

We show the math, not a black box.

Most calculators hand you a number and hope you trust it. KibbleLab shows the weight it used, the energy requirement it started from, and the factor it applied, so you can check every step and so can your vet.

RER = 70 × (weight in kg)^0.75

Daily target = RER × a weight-loss factor

Grounded in published veterinary guidance: the NRC (2006) energy equations, the 2021 AAHA weight-management guidelines, and the 9-point body condition score (Laflamme, 1997).

Want the full method? Read the science behind every number .

Species matters

What's different for cats

Cats must lose weight slowly. Dropping it too fast can trigger fatty liver disease, which is dangerous, so KibbleLab caps a cat's pace lower and leans on measured meals instead of free-feeding.

Honest portion guidance. No shame, just a plan.

Weight loss is capped to a steady pace, roughly 1 to 2% of body weight a week for dogs and a little slower for cats, and it never drops below a set floor. Plans pause for pregnant or nursing pets. Every change is one you can walk into the exam room and defend.

Then find a food that fits the plan.

Once you have a target, KibbleLab points you to foods that hit it comfortably: satisfying portions, the right calories, and balanced nutrition, ranked for your cat in particular.

Find cat food that fits

Common questions

Pet weight loss, answered.

How many calories should my cat eat to lose weight?

It depends on target weight, age, activity, and spay or neuter status. KibbleLab calculates a daily target from published veterinary guidelines and shows exactly how it got there. Enter your cat once to see the number.

How fast should a pet lose weight?

Slow and steady. KibbleLab sets a conservative first-step target rather than a crash goal, and reassesses at each milestone. Rapid loss can be dangerous, especially for cats.

What is a body condition score?

A 9-point scale vets use to judge whether a pet is under, over, or at a healthy weight. KibbleLab walks you through it with pictures and uses it to set a realistic target.

Read the full guide to body condition scoring

KibbleLab is informational, and is not a substitute for veterinary advice. Always work with your veterinarian on a weight plan for your pet, especially if it has a health condition or takes medication.

KibbleLab is not affiliated with, endorsed by, or certified by WSAVA or AAFCO. We reference these standards; we do not represent them.

Turn "lose weight" into a plan you can track.

Set your cat's target in a few minutes, and let KibbleLab do the math and keep the record.

Get your cat's number