RediCalc.com
Last updated: June 1, 2026

Pet Food Calculator

Calculate your pet's daily food and calorie needs based on their weight and activity level.

Advertisement

Understanding the Pet Food Calculator

A pet food calculator estimates how much to feed your dog or cat each day based on their weight, age, activity level and the calorie content of their food. Overfeeding is one of the most common pet health problems, contributing to obesity and shortened lifespans. A calculator translates feeding guidelines into a concrete daily portion so your pet gets the right amount, not just a guessed scoop.

Calories, not just cups

Feeding charts on packaging are generic, and foods vary widely in calorie density, so a "cup" of one food may have far more energy than another. Calculating your pet’s daily calorie needs from their weight and activity, then dividing by the food’s calories per cup, gives an accurate portion. This prevents the slow weight gain that vague scooping often causes.

Adjusting for life stage and activity

Puppies and kittens need more calories per pound for growth, while seniors and less active pets need fewer. Spaying or neutering also lowers calorie needs. Treats count too — they should stay under about 10% of daily calories. Reassessing portions as your pet ages, changes activity, or gains weight keeps them in healthy condition over their lifetime.

Tips & things to know

  • Feed by calories, not cups — foods vary widely in calorie density.
  • Keep treats under about 10% of daily calories.
  • Reassess portions after spaying/neutering and as your pet ages or changes activity.

How It Works

Uses the Resting Energy Requirement (RER) formula with activity multipliers.

RER = 70 × (weight in kg)^0.75

Daily Calories = RER × Activity Multiplier

How to Use the Pet Food Calculator

1

Open the Pet Food Calculator

Navigate to the Pet Food Calculator page on Redicalc. The calculator loads instantly with no sign-up required.

2

Enter your values

Fill in your values into the input fields. Toggle between metric and imperial units if available.

3

Review your results

Your pet food results appear instantly as you type. Review the breakdown, charts, or detailed analysis provided.

4

Adjust and compare

Try different input values to compare scenarios. This helps you understand how changes affect the outcome.

5

Share or save your results

Use the copy or share buttons to save your results. You can also bookmark the page for quick access later.

Advertisement

Related Calculators

Frequently Asked Questions

How much should I feed my dog?

It depends on weight, age, and activity. This calculator gives a starting point — consult your vet for personalized advice.

Are the cup measurements exact?

They are approximations based on average dry food density (~400 cal/cup). Check your specific brand for exact calorie content.