Animal Nutrition Requirement Calculator

Work out animal nutrition requirement instantly with clear inputs, formula shown and shareable results.

About Animal Nutrition Requirement Calculator

Applies the allometric resting energy requirement of 70 times body weight to the power 0.75, then multiplies by the life stage factor.

Formula

Energy requirement

RER (kcal/day) = 70 x weight(kg)^0.75; MER = RER x life stage factor

Worked example

With the default values below, Animal Nutrition Requirement Calculator returns Maintenance energy requirement of 1,059. Change any input above and every figure here is recalculated in your browser.

Inputs used

Animal weightaccepts 0.2–200 kg: 20 kg
Life stage factoraccepts 0.8–3: 1.6
Energy per cup of foodaccepts 50–800 kcal: 350 kcal

Results

Maintenance energy requirement: 1,059 kcal/day
Resting energy requirement: 662 kcal/day
Cups of food per day: 3.03
Energy per kilogram: 53.0 kcal/kg/day

Step by step

1Values used
2Energy requirement
3Maintenance energy requirement= 1,059 kcal/day
4Resting energy requirement= 662 kcal/day
5Cups of food per day= 3.03
6Energy per kilogram= 53.0 kcal/kg/day

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why the 0.75 exponent?

Metabolic rate scales with body surface area rather than mass, which the three-quarter power law approximates across species.

Which factor is used for weight loss?

Feeding at RER, a factor of 1.0, based on ideal rather than current body weight.