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Free cat calorie calculator for resting energy (RER) and a maintenance-style (MER) estimate from weight and life stage—useful for comparing bags and cans to a daily kcal budget. Always confirm with your veterinarian. See also our dog weight calculator for canine tools.
Last updated: April 18, 2026
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Typical adult cats often fall near 8–12 lb (3.5–5.5 kg).
Estimate
About 218 kcal/day resting need (RER) × 1.2 (Adult neutered (maintenance)) → roughly 261 kcal/day as a maintenance-style estimate (MER).
Weight (kg)
4.5
RER
218 kcal/day
Factor
× 1.2
MER (style)
261 kcal/day
Adult neutered (maintenance)
Think of RER as the calorie line for resting metabolism at a given body weight—before adding growth, pregnancy, lactation, or activity adjustments.
MER applies a multiplier for life stage. Your clinic may use different factors or a body-condition target instead of a single formula.
10 lb, adult neutered → about 218 kcal/day RER and roughly 261 kcal/day MER-style.
We convert your cat’s weight to kilograms, compute RER as 70 × kg^0.75, then multiply by a life-stage factor to approximate a maintenance-style daily calorie budget. Factors are common textbook-style ranges and are not identical in every clinic. Use the result to compare to food labels (kcal per can, cup, or gram) and to discuss targets with your veterinarian. More fitness & lifestyle tools are on the hub.
RER (kcal/day) ≈ 70 × (weight_kg)^0.75
MER (kcal/day) ≈ RER × life_stage_factor
Tracking your own intake? Try the calorie calculator.
Get Custom Calculator for Your PlatformIf a can is 100 kcal, about 2.5 cans per day matches 250 kcal—split into meals and adjust with your vet’s plan.
Add kcal from dry and wet portions together; treat extras (treats, dental diets) as part of the daily budget.
Share it with other cat parents planning feeding with their vet.
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