A free pet weight tracker is a simple tool that lets you log your pet's weight over time and see the trend on a chart. Add as many pets as you like - everything is saved in your browser, no account needed.
Add a pet profile with their name, species, and (optionally) a target weight. Each time you weigh your pet, click "Add weight" and enter the date and value. The chart updates instantly and the insights panel shows whether your pet is trending toward or away from their target weight.
Weight changes are one of the earliest signs of trouble in pets. Sudden gain often means too many treats, hidden illness, or reduced activity. Sudden loss can signal dental disease, parasites, diabetes, kidney issues, or cancer. A simple monthly log helps you and your vet catch problems early.
Weigh healthy adult dogs and cats once a month. Weigh puppies and kittens weekly while they grow. Weigh weekly if your pet is on a weight-loss or weight-gain plan, or recovering from illness. Use the same scale and weigh at the same time of day for the most consistent readings.
Healthy weight depends on breed, age, and build. As a rough guide: most domestic cats land between 8-12 lbs, small dogs 3-25 lbs, medium dogs 25-50 lbs, large dogs 50-100 lbs, and giant breeds 100 lbs and up. Use a body condition score with your vet to confirm your pet's ideal weight.
Yes. The Pet Weight Tracker is 100% free and requires no signup, email, or account. You can use it as long as you like with no ads or paywalls.
All data is saved locally in your browser using localStorage. Nothing is sent to a server, and we cannot see your pet's information. Your data stays on your device.
For healthy adult pets, weighing once a month is usually sufficient. Weigh puppies and kittens weekly until they are full grown. If your vet has recommended a weight management plan, weigh weekly so you can spot trends quickly.
Set a target weight in the tracker to see how far above or below the goal your pet is. For overweight pets, your vet may recommend reducing daily calories by 10-20% and increasing exercise. For underweight pets, rule out parasites or dental issues first, then adjust calorie intake. Always confirm with your veterinarian.
Yes. You can add as many pets as you like, each with their own weight history, target weight, breed, and notes. Switch between pets at any time.
Estimate your puppy's adult weight from breed and current weight.
Daily calorie needs based on weight, age, and activity level.
RER/MER-based calorie needs for cats by life stage.
How much to feed your dog in cups, grams, and calories per day.
Run a pet care business? PetRoute gives pet sitters and dog walkers complete client management, invoicing, and route planning - all in one place.