Dog Diet Calculator
Dog diet calculator works out Resting energy requirement and Daily (maintenance) energy requirement from Body weight, Weight unit and Life stage. The default figures on this page give daily (maintenance) energy requirement of 630 kcal/day; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
4 steps
- Body weight = 10.000 kg
- RER = 70 x 10.000^0.75 = 70 x 5.623413 = 393.64 kcal/day
- MER = 1.6 x RER (Neutered adult, dog) = 629.82 kcal/day
- No food energy density supplied, so no portion was computed.
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the dog diet calculator calculates
Calculates a dog or cat's resting and daily maintenance energy requirement from body weight and life stage, and converts the result into a daily food portion.
How to use this dog diet calculator
Enter Body weight, Weight unit, Life stage and Report. Resting energy requirement updates as you type. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Resting energy requirement, Daily (maintenance) energy requirement and Daily energy, low end of the range.
The method follows Pet Nutrition Alliance - Calculating Calories Based on Pet Needs (RER = 70 x BWkg^0.75; Table 1 MER factors) and WSAVA Global Nutrition Committee - Nutrition Toolkit.
What you can compare
Change one input at a time to see how it affects Resting energy requirement, Daily (maintenance) energy requirement and Daily energy, low end of the range. The inputs you can vary are Body weight, Weight unit, Life stage, Report, Override the RER factor (optional) and Food energy density.
Understanding Resting energy requirement, Daily (maintenance) energy requirement and Daily energy, low end of the range
Educational estimate only. The published MER factors are starting points - individual animals vary by as much as 50% - and a veterinarian should set the feeding plan, especially for weight loss, growth, gestation or illness.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What is the 80/20 rule for dog food?
On the figures this page opens with — body weight 10 — the daily (maintenance) energy requirement is 630 kcal/day. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
How much should my dog eat according to a day chart?
It needs Body weight, Weight unit, Life stage, Report, Override the RER factor (optional) and Food energy density. Nothing else is required, and the figures stay in your browser.
What is the 90/10 rule for dogs?
The result gives Resting energy requirement, Daily (maintenance) energy requirement, Daily energy, low end of the range, Daily energy, high end of the range, RER multiplier used and Food per day, each labelled with its unit so the figure can be read on its own.
How do I calculate my dog's daily calorie needs?
Calculates a dog or cat's resting and daily maintenance energy requirement from body weight and life stage, and converts the result into a daily food portion. Open “How this is worked out” beside the result to see each step for your own figures.
How can I calculate how much food my dog needs?
The page opens with worked default figures: daily (maintenance) energy requirement of 630 kcal/day. Replace them with your own and every figure updates as you type.
How much dog food per day by weight chart?
The method comes from Pet Nutrition Alliance - Calculating Calories Based on Pet Needs (RER = 70 x BWkg^0.75; Table 1 MER factors) and WSAVA Global Nutrition Committee - Nutrition Toolkit, listed in full under Sources so the figures can be checked against the original.