Dog Food Portion Calculator
Estimate a dog's daily food portion from body weight, activity level and the food's energy density.
The exponent is not a typo
Energy needs scale with metabolic body weight — weight to the power of 0.75 — not with weight itself. A 40 kg dog needs about 70% more food than a 20 kg dog, not twice as much. Feeding guides printed on packaging often use a straight linear scale, which systematically overfeeds large breeds.
Body condition beats any formula
You should feel the ribs easily with flat hands and see a waist from above. Adjust portions by 10% and reassess after two weeks. A vet can help if weight will not shift.
The formula
RER = 70 × weight^0.75; daily need = RER × activity factor
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Dog Food Portion Calculator
- Fill in each field with your own figures — the defaults are only there as an example.
- The result updates as you type, so there is no button to press.
- Check the breakdown under the main result for the supporting numbers.
- Use the copy button to take the result with you, or share the link to reload the same inputs.
Dog Food Portion Calculator — frequently asked questions
Is this dog food portion calculator free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
How accurate is the result?
The maths is exact for the formula shown on the page. Accuracy in the real world depends on your inputs and on assumptions the formula cannot see, so treat the output as a well-grounded estimate rather than a quote.
Can I use it on my phone?
Yes. The page is responsive, weighs a few kilobytes and works offline once loaded, so it behaves the same on a phone as on a desktop.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the dog food portion calculator.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 23, 2026 · Calculation runs client-side · No data collected · Report an error