How much should I feed?
Daily calories and cups for dogs and cats.
Free · No sign-up · Runs in your browser
Pet calculators that answer one question well.
Food, water, age, crate size, pregnancy and costs. Each tool shows the formula behind the number and the range where real life usually lands.
- Sources cited
- Private by default
- Works on mobile
Example · Dog foodFree
590 kcal
per day for a 20 lb neutered adult
1.7 cups570–690 kcal rangeFormula shown
Every result includes the reasoning.
Start here
Start with your question
Did they eat something toxic?
Estimate chocolate risk and see when it is urgent.
How old is my pet in human years?
Convert age and see when life-stage screening starts.
Published formulas
Every calculator names the method behind the number.
Private by default
The maths runs in your browser. No pet profile is stored.
Clear limits
Results include ranges and the point where a vet should take over.
Browse the library
All calculators
14 calculators
No calculators match that search.
Dog
Dog Food Calculator
Daily calories and cups, based on weight, life stage and your food’s kcal/cup.
Open calculator DogDog Age Calculator
Convert dog years to human years with the size-adjusted 15/24 method.
Open calculator DogDog Water Intake Calculator
A daily water target adjusted for activity, heat and wet food.
Open calculator DogDog Crate Size Calculator
Measure once, then match body length, shoulder height and weight to a crate.
Open calculator DogChocolate Toxicity Calculator for Dogs
Estimate theobromine dose and see whether the amount is low risk or an emergency.
Open calculator DogDog Pregnancy Calculator
Due date and whelping window from the breeding date, plus warning signs.
Open calculator DogPuppy Weight Calculator
Project adult weight from current weight, age and expected breed size.
Open calculator DogDog Ideal Weight Calculator
Calculate target healthy weight from current weight and 9-point Body Condition Score.
Open calculator DogDog Weight Loss Calculator
Safe weekly timeline and target daily calories to help your dog reach their goal weight.
Open calculator CatCat Food Calculator
Calories and portions for dry or wet food, with a safe weight-loss note.
Open calculator CatCat Age Calculator
Convert cat years to human years and see when senior screening starts.
Open calculator CatCat Water Intake Calculator
Daily hydration target for dry, mixed or wet diets, plus urinary warning signs.
Open calculator CatCat Pregnancy Calculator
Queening date and window from the breeding date, with a care timeline.
Open calculator Dogs & catsPet Cost Calculator
First-year and ongoing costs for a cat or dog, with the hidden expenses listed.
Open calculatorTransparent by design
How the numbers are made
Feeding calculators use resting energy requirement, the energy a pet uses at rest, adjusted for life stage and activity. That is the same starting point many veterinary nutrition guidelines use. Water estimates scale with body weight and then adjust for diet, heat and exercise. Age conversions follow the widely used 15/24 rule, with size-based ageing after the second year.
None of these tools can examine your pet. They are built to give you a sensible starting point and better questions for your veterinarian, not to replace one. If a result looks far from what your pet’s body condition suggests, trust the body condition and call your vet.