Pet Food Calculator

Calculate daily food portions for dogs and cats using the veterinary RER formula. Based on weight, age, and activity level with monthly cost estimates.

Pet Type

Weight (lbs)

Life Stage

Activity Level

Body Condition

Spayed/Neutered (needs ~10% fewer calories)

Daily Calories

655 kcal

RER: 727 kcal

Meals Per Day

0.9 cups/meal (dry)

Monthly (Dry)

$38.77

12.9 lbs/month

Dry Food Only

1.7 cups/day

12.9 lbs/month

$38.77/month

$465.21/year

Wet Food Only

1.6 cans/day

13 oz cans

$122.76/month

$1,473.16/year

Mixed (50/50)

0.9 + 0.8

cups + cans per day

$80.77/month

$969.18/year

Dog Size Reference

Size / Breed	Weight Range	Daily Cal (est)	Cups/Day (est)
Toy (Chihuahua, Yorkie)	2-10 lbs	148 kcal	0.4
Small (Beagle, Corgi)	10-25 lbs	338 kcal	0.9
Medium (Border Collie, Bulldog)	25-50 lbs	592 kcal	1.6
Large (Lab, Golden Retriever)	50-80 lbs	886 kcal	2.3
Giant (Great Dane, Mastiff)	80-150 lbs	1,314 kcal	3.5

Feeding Guidelines

Measure Portions

Use a cup

Eyeballing leads to overfeeding

Consistent Schedule

2x daily

Feed at the same times each day

Fresh Water

Always available

1 oz water per lb body weight/day

Weight Checks

Monthly

Adjust food if weight changes

Treats

< 10% calories

Treats should not exceed 10% of daily intake

Transition Food

7-10 days

Mix old and new food gradually

How to Use Pet Food Calculator

1Select dog or cat
2Enter pet weight and age
3Choose activity level
4View daily portions and cost

Frequently Asked Questions

How much should I feed my dog?▾

Use RER formula: 70 × weight in kg^0.75, then multiply by activity factor. A 50 lb moderately active dog needs about 1,100-1,300 calories per day, or roughly 3 cups of dry food.

How many calories does a cat need?▾

Indoor cats need 20-25 calories per pound of body weight. A 10 lb indoor cat needs about 200-250 calories/day, roughly 1/3 to 1/2 cup of dry food.

How often should I feed my pet?▾

Puppies (under 6 months): 3 meals/day. Adult dogs: 2 meals/day. Kittens: 3-4 meals/day. Adult cats: 2 meals/day.

About Pet Food Calculator

Calculate daily food portions for dogs and cats using the veterinary RER formula. Based on weight, age, and activity level with monthly cost estimates.

NexTool's Pet Food Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.