Cat Calorie Calculator

Plan feeding with crystal‑clear RER and MER math, adjust for life stage, activity and BCS, cap treats at 10%, estimate hydration and cost, visualize weight trends, and save multi‑cat profiles. Educational only—always consult your veterinarian for kittens, seniors, pregnancy, lactation, or chronic conditions. Includes brand presets, custom labels, cups/cans conversions, CSV/PDF export, and budgets.

Cat Profile
BCS: 5
LowMediumHigh
Treats & extras
Recommended ≤ 10% of daily kcal
Shows tailored caution notes.
Food energy density & brand
Or choose “Custom / from label”.
Budget (optional)
Results update live. Print to PDF via the button below.
Feeding plan (per day)
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Daily kcal (MER)
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Food kcal after treats
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grams/day
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cups/day
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cans/day
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per meal (g / cup / can)
Treats cap (10%)
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Hydration helper
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Budget est.
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ETA to target
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Show formulas & steps
Cautions
    This tool is informational only and not a substitute for veterinary care. Always consult your veterinarian, especially for kittens, seniors, pregnant/lactating cats, or chronic conditions.
    Saved profiles
    NameWeight (kg)GoalMER kcalFood kcalg/daycupscansActions
    Totals
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    kcal/day
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    grams/day
    Use totals to estimate shared bag usage or plan feeding stations.
    MER factor table
    ScenarioTypical factor*Notes
    Neutered adult1.2–1.4×Indoor low activity closer to 1.2
    Intact adult1.4–1.6×Higher baseline
    Weight loss0.8–1.0×Use target weight; vet oversight
    Weight gain1.2–1.8×Gradual increases
    Kitten 0–4 mo~2.5×Rapid growth
    Kitten 4–12 mo~2.0×Tapers with age
    Pregnant/Lactating2.0–4.0×Litter size dependent
    *Ranges vary; always consult your veterinarian.
    FAQ (quick)

    RER = 70 × (weight_kg0.75). MER = RER × factor (life-stage, activity, BCS). This tool shows each step and factor adjustments transparently.

    Typically ~0.5–2% of body weight per week under veterinary guidance. This tool flags unsafe rates and projects the timeline to target weight.

    Yes. Keep treats ≤10% of daily calories. The calculator subtracts treats automatically and warns if you exceed the cap.

    Wet food has lower kcal per gram (more water). Enter kcal/can and can size; the tool converts to grams/day and accounts for moisture in hydration estimates.

    No—this is an educational tool. Cats with conditions (IBD, diabetes, CKD, pancreatitis), kittens, seniors, & pregnant/lactating cats need individualized plans from a veterinarian.

    How this Cat Calorie Calculator Works

    This calculator estimates a tailored daily feeding plan using two veterinary nutrition staples: Resting Energy Requirement (RER) and Maintenance Energy Requirement (MER). RER approximates baseline energy needs at rest, while MER scales that baseline for life stage, activity, and body condition. You enter weight, select the most appropriate scenario, and the tool shows every step, from the raw equations to the final grams, cups, or cans per day, split across your chosen number of meals.

    Formulas and Example

    The core formula is RER = 70 × (weightkg0.75). MER is generally MER = RER × factor, where the factor depends on neuter status, age, growth, pregnancy or lactation, body condition score (BCS), and real‑world activity. Suppose a 4.5 kg neutered indoor cat with medium activity. RER ≈ 70 × 4.50.75. If the combined factor lands near 1.3, then MER ≈ RER × 1.3. The calculator displays these values transparently and then subtracts any treats (capped at 10% by default) to determine how many calories should come from main meals.

    ScenarioTypical factorNotes
    Neutered adult1.2–1.4×Lower end for mostly indoor and sedentary lifestyles
    Intact adult1.4–1.6×Higher baseline energy compared with neutered cats
    Weight loss0.8–1.0×Use target weight; aim for ~0.5–2% body weight loss/week
    Weight gain1.2–1.8×Increase gradually and re‑check weight frequently
    Kitten 0–4 months~2.5×Rapid growth; frequent, smaller meals
    Kitten 4–12 months~2.0×Growth rate tapers as adult weight approaches
    Pregnant/Lactating2.0–4.0×Varies with litter size and stage of lactation

    Energy Density and Serving Conversions

    To convert calories into practical servings, enter any available label data: kcal per cup, kcal per can, or kcal per 100 g. If you provide kcal/100 g, the tool calculates grams/day directly. If you supply kcal/cup or kcal/can, it first determines cups/day or cans/day and then converts to grams using your stated cup or can weight. Wet food moisture is also used to estimate water intake contributed by canned meals.

    Input typeExample label valueConversion used
    kcal/100 g (dry)360 kcal/100 ggrams/day = meal kcal ÷ (kcal/100 g ÷ 100)
    kcal/cup (dry)380 kcal/cupcups/day = meal kcal ÷ kcal/cup; grams/day = cups × grams/cup
    kcal/can (wet)180 kcal/5.5 oz cancans/day = meal kcal ÷ kcal/can; grams/day = cans × grams/can

    Treats, Hydration, Budget, and Safety

    Treats are automatically capped at no more than ten percent of daily energy and subtracted from main meals. Hydration need is estimated at roughly 50 mL per kg of body weight. When wet food is entered, its moisture (for example, 75%) contributes to the daily water estimate. Optional price fields compute an approximate cost per day and per month, helping you plan purchases and compare brands fairly by energy delivered. The projection chart visualizes weekly weight change based on your selected goal and rate. Rapid shifts—especially quick losses in cats— can be risky; always adjust gradually and partner with your veterinarian.

    Finally, condition flags (such as diabetes, CKD, IBD, or pancreatitis) trigger caution notes to encourage a clinical conversation rather than one‑size‑fits‑all advice. This tool is educational and aims to make label math simple, choices transparent, and feeding more consistent. Re‑weigh every one to two weeks, check body condition, and fine‑tune portions to keep your cat healthy, satiated, and active.

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    Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.