Free dog and cat calculators, built on real data

Predict a puppy’s adult weight from growth data on 60,000+ dogs, find a due date, or work out how much to feed. Every number has a source.

Puppy weight calculator Dog years calculator Dog pregnancy calculator

A Bengal cat and a Yorkshire terrier sitting together by a bright window

Photo: Helena Jankovičová Kováčová / Pexels

Dog tools

Black Labrador puppy lying on a light wooden floor

Puppy weight calculator

Predict adult weight from your puppy’s age and weight.

A mother dog nursing her puppies outdoors in daylight

Dog pregnancy calculator

Due date and a week-by-week timeline from the breeding date.

Close-up portrait of a senior dog with a grey muzzle

Dog years calculator

Your dog’s age in human years, by size.

A full bowl of dog food on a wooden floor

Dog food calculator

Daily calories and cups from weight and life stage.

An Australian shepherd puppy eating from a metal bowl

Raw dog food calculator

Grams of raw food per day from calorie needs.

A Weimaraner dog lying on a sunny green grass field

Dog heat cycle calculator

Next heat and fertile window from the last heat date.

Cat tools

Cat years calculator

Your cat’s age in human years.

Close-up of a young tabby kitten against a light backdrop

Kitten age chart

Estimate a kitten’s age from weight, teeth, eyes and ears.

A grey cat eating from a green bowl on a tiled floor

Cat food calculator

Daily calories and cans or cups, split wet and dry.

Size charts

A beagle looking out from inside a wire crate

Dog crate size chart

Find the right crate length from your dog’s measurements.

Dog collar size chart

Neck measurement to collar size, with a breed chart.

A small terrier wearing a black harness, sitting outdoors

Dog harness size chart

Compare harness sizes across brands from chest girth.

Popular answers

Dogs are pregnant about 63 days.

A small-breed puppy is about half its adult weight by 16 weeks.

A cat’s first year is about 15 human years.

For a crate, measure nose to tail base and add 2–4 inches.

Who’s behind PawScales

PawScales is built by Sikander Malik from published veterinary research and open data. Each tool shows its formula and sources, and he reviews every page before it goes live.