Cat-Culator (Cat Age & Calorie Calculator

Feline Veterinary Medicine & AAHA / WSAVA Nutrition Metrology

Feline life stage aging and caloric energy requirements follow non-linear metabolic scaling:

• **

• AAHA Feline Age Conversion Formula**:

• Year 1: 15 human years

• Year 2: +9 years = 24 human years

• Year 3+: +4 human years for each calendar year

Human Age = 24 + (Cat Age - 2) × 4

• **

• Feline Energy Requirements**:

W_kg = W_lbs2.20462

Resting Energy Requirement (RER) = 70 × (W_kg)^0.75 kcal/day

• Neutered Indoor Adult: MER = 1.2 × RER

• Intact Active Adult: MER = 1.4 × RER

• Weight Loss Calorie Deficit: MER = 0.8 × RER

• Senior Cat: MER = 1.1 × RER

• Growing Kitten (< 1 yr): MER = 2.0 × RER

• **

• Standard Feline Health Benchmarks**:

• 1-Year-Old (8 lbs, Neutered): 15 Human Yrs | 221 kcal/day | 1.4 cans + 0.29 cups | 200 ml water

• 5-Year-Old (10 lbs, Neutered): 36 Human Yrs | 261 kcal/day | 1.6 cans + 0.35 cups | 249 ml water

• 12-Year-Old (9 lbs, Senior): 64 Human Yrs | 222 kcal/day | 1.4 cans + 0.30 cups | 225 ml water

• 16-lb Overweight Cat (Diet): 40 Human Yrs | 250 kcal/day | Controlled deficit portions

How to Use This Calculator

Enter your Cat Age (in Calendar Years) (e.g. 5 in years), Cat Body Weight (e.g. 10 in lbs), Neutering Status & Activity Level — choose from Neutered / Spayed Indoor Adult (Standard 1.2 × RER), Intact / High Activity Outdoor Adult (1.4 × RER), Weight Loss / Inactive Obese Prone (0.8 × RER), Primary Food Diet Type — choose from Mixed Diet (50% Wet Canned Food + 50% Dry Kibble), 100% Dry Kibble (Avg ~375 kcal / cup), 100% Wet Canned Food (Avg ~80 kcal / 3 oz can), and Feline Profile Benchmark — choose from Custom Feline Profile, 5-Year-Old Indoor Cat (10 lbs, Neutered) → 36 Human Years / 261 kcal/day, 1-Year-Old Young Adult (8 lbs, Neutered) → 15 Human Years / 221 kcal/day. Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Year 1 = 15 human years

Year 2 = +9 years (24 human years)

Year 3+ = +4 years per year

Resting Energy Requirement (RER) = 70 * (Weight_kg)^0.75

Worked Example

A cat owner caring for a 5-year-old 10-lb neutered cat calculates that their pet is 36 human years old, requiring 261 kcal/day, portioning out 1.6 cans of 3 oz wet food plus 1/3 cup of kibble with 249 ml of fresh fountain water.

Understanding Your Result

This calculation gives a precise result based on the inputs you provided. For practical decisions, consider whether the result changes meaningfully with slight variations in your inputs — if a 5–10% change in input causes a significant output change, gather more precise input data before deciding. Use this tool to quickly compare multiple scenarios side by side.