What this calculator does
Dog & cat daily calories works out daily energy needs from resting energy requirement and an activity factor. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaRER = 70 × weight(kg)^0.75; MER = RER × activity factor
The inputs explained
| Field | What to enter |
|---|---|
| Body weight (kg) | A number, measured in kg. Starts at 20. |
| Life stage / activity | Choose from Weight loss, Neutered, prone to weight gain, Senior or low activity, Typical neutered adult, Typical intact adult, Active / working adult, Puppy or kitten, over 4 months, Puppy or kitten, under 4 months. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with body weight
Every other input is held at the calculator’s starting values while body weight varies. Select any row to load that scenario into the calculator.
How the answer changes with body weight