Calculadora de Alimentação para Cães

RER = 70 × peso_kg^0,75. Necessidade energética de manutenção (MER) = RER × fator de vida.
Created by
Renato Passos, Eng. de Software
Reviewed by
Renato Passos, Eng. de Software

Last updated: Apr 18, 2026

RER
662 kcal/dia
MER
1.059 kcal/dia
Ração por dia
303 g

Formula

RER = 70 × kg^0,75;  MER = RER × fator

About this calculator

The Dog Feeding Calculator estimates the daily energy requirement for a dog based on the Resting Energy Requirement (RER) and Maintenance Energy Requirement (MER). RER is calculated using the formula RER = 70 × weight_kg^0.75, representing energy for vital functions at rest. MER is obtained by multiplying RER by a life factor that varies with age, activity, reproductive status, and health. This tool helps owners plan feeding, avoiding excess or deficit calories.

To use the calculator, enter the dog's weight in kilograms and select the appropriate life factor. For example, an adult neutered dog with normal activity has a factor of 1.6; a growing puppy may reach 3.0. The result is MER in kcal/day, which should be converted to grams of food based on the energy density of the diet. Remember this is an initial estimate; adjustments may be needed based on body condition.

When to use? Ideal for owners starting a balanced diet, veterinarians needing quick calculations, or situations like diet changes, planned weight gain or loss. It does not replace professional follow-up, especially for dogs with chronic diseases, pregnant or lactating. The calculator considers only energy; nutrients like protein and fat should be evaluated separately.

Common pitfalls: overestimating the life factor, leading to overfeeding; using inaccurate weight; ignoring that energy needs vary with climate (dogs in cold environments burn more). Always monitor body condition score and adjust amounts accordingly. Consult a veterinarian to define the ideal factor and choose appropriate food.

Frequently asked questions

Which life factor should I use for an adult neutered dog?

For an adult neutered dog with normal activity, use factor 1.6. If active, use 2.0.

How do I convert kcal to grams of food?

Check the energy density on the package (kcal/kg). Divide the MER (kcal/day) by that value and multiply by 1000 to get grams.

Does the calculator work for puppies?

Yes, but use the appropriate life factor for growth (e.g., 2.5 to 3.0). Puppies have higher energy needs.

Can I use it for senior dogs?

Yes, but the life factor is usually lower (1.4 to 1.6) due to reduced activity. Adjust based on body condition.

What if my dog doesn't eat the calculated amount?

Monitor body condition. If underweight, increase; if overweight, decrease. Consult a veterinarian for adjustments.

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