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Evidence-led free tool

Cat Food & Calorie Calculator

Calculate a careful starting estimate for daily calories and turn it into real food amounts from the kcal value on your cat-food label. The tool cross-checks recognized veterinary nutrition references instead of pretending one formula fits every cat.

Start calculatorSee the method
95–100%?Accuracy note: the arithmetic can be exact, but biological energy needs cannot honestly be guaranteed 95–100% from a one-time questionnaire. Stable measured intake + weight trend is the strongest personalization this tool can use.
Siamese Cat Creative Club

Designed for transparent calculation

FEDIAF 2025 cat-specific energy references + AAHA/Merck RER/MER cross-check + BCS/MCS safety logic.

FEDIAF 2025AAHAMerckWSAVA
Runs in your browserNo account or server upload
Food-label conversionkcal/kg, cup, can, pouch
Weight safety logicBCS, MCS and trend flags
Research reviewedEvidence review: 8 Aug 2026
Calculator

Build your cat’s feeding estimate

Start with the cat, then add label calories. Optional trend data can personalize maintenance when weight has truly been stable.

1

Cat profile

Weight and age are required.

2

Body condition & goal

BCS and muscle condition catch cases where a simple formula is unsafe.

Body Condition Score (BCS 1–9)
3

Feeding setup

Treats should normally stay within 10% of daily calories.

Optional precision data

If you have weighed food and a previous weigh-in, enter them. Stable measured intake over ≥14 days and at least 3 weigh-ins can be used as a personalized maintenance starting point at ideal BCS.

4

Food label conversion

Use metabolizable energy from the package or manufacturer. kcal/kg + a kitchen scale gives the most reproducible portion.

Why the result is a starting point

Accuracy comes from calculation + measurement

The strongest version of this calculator does not hide disagreement between references. It shows the equation, the cross-check, and when your own stable intake is better evidence for your individual cat.

RER / MER cross-check

RER = 70 × BWkg0.75

AAHA and Merck use RER = 70 × kg^0.75, then multiply by life-stage factors. The calculator displays this as a cross-check.

Cat-specific metabolic weight

Adult cat MER ≈ factor × BWkg0.67

FEDIAF 2025 uses kg^0.67 for cats and gives separate adult, kitten, gestation and lactation references. That is the primary population model here.

BCS-derived ideal weight

Ideal BW ≈ current BW ÷ (1 + 0.1 × [BCS − 5])

For BCS 6–9, AAHA relates each point above 5/9 to roughly 10% excess body weight. The estimate is less reliable at extreme obesity.

Real-world personalization

If an ideal-BCS cat has been eating a measured number of calories, weight is stable for at least 14 days, and there are at least 3 weigh-ins, that observed intake is used as the maintenance starting point.

How to get the most accurate result in practice

01

Calculate

Use weight, life stage, BCS, neuter status and activity.

02

Weigh the food

Prefer grams and kcal/kg instead of a loosely filled measuring cup.

03

Re-weigh the cat

Track body weight and BCS on the same scale and similar conditions.

04

Adjust to response

Use the measured trend, not blind faith in the first number.

Part of the Siamese Cat family

Free tools that lead back to real communities

This tool is published in the Siamese Cat Creative Club tools library, connects visitors with Siamese Cat Cafe.

Sources

Primary and authoritative references used

The calculator deliberately links the evidence so formulas can be audited and updated.