Dog calculators

Quick, free answers to the questions dog owners ask most, with the math shown so you can check it.

Most of these tools are built on one formula vets use every day: the resting energy requirement, 70 × (weight in kg)0.75. It estimates the calories your dog burns at rest. Multiply it by a factor for age, neuter status and activity and you get a daily calorie target. From there, it’s a short step to cups of food, a weight-loss plan or a puppy feeding schedule.

Other tools use different evidence. Puppy weight estimates come from published growth standards for dogs of different sizes. Dog age uses a size-based chart that many US vet clinics display. The pregnancy calculator follows veterinary gestation ranges. Every tool page explains its formula, walks through an example and lists its sources.

Two things to keep in mind. First, these are starting points for healthy dogs. Dogs vary, and your dog’s weight and body shape over a few weeks will tell you more than any formula. Second, if your dog is sick, pregnant, on a prescription diet or losing weight without trying, check with your vet before making changes.

Feeding

Start here if you’re unsure how much to put in the bowl. The food calculator turns calories into cups and grams for your own bag.

Dog Food CalculatorCups and grams per day for your dog and your food Dog Calorie CalculatorDaily calories (RER and MER) with the vet formula Puppy Food CalculatorHow much and how often to feed your puppy Dog Feeding ChartCalories and cups by weight, 5 to 150 lb

Growth and size

For puppies: estimate adult weight, compare with the growth chart, and buy a crate that will still fit in a year.

Puppy Weight CalculatorHow big your puppy will get, as a range Puppy Growth ChartExpected weight by age for each size class Dog Crate Size CalculatorThe right crate from two quick measurements

Age

Convert dog years to human years by size and see which life stage your dog is in.

Dog Age CalculatorDog years to human years, by size

Health and weight

Plan safe weight loss and check whether your dog is drinking a normal amount of water.

Dog Weight Loss CalculatorSafe daily calories and weeks to goal Dog Water Intake CalculatorHow much water your dog should drink a day

Breeding

Work out the due-date window and a week-by-week plan for a pregnant dog.

Dog Pregnancy CalculatorDue date window and week-by-week timeline

Which dog calculator should I use?

Want the background first? Our guides explain the reasoning in plain English.