Calculate the perfect daily feeding amount for your cat — dry, wet, or a mix — with costs, scenarios, and a full health guide.
Cat Details
Neutering reduces caloric needs by ~20%
Advanced Cost Settings ▾
Daily Feeding
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Based on RER × life stage × activity × condition
RER: —DER: —Mix: —Per Meal: —
Daily kcal
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Dry Amount
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Wet Amount
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Monthly Dry Cost
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Monthly Wet Cost
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Total Monthly
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Feeding Schedule
Food Mix Breakdown
Feeding Scenarios
Three caloric targets based on your current cat profile. Calculate first for accurate results.
Calculate in Tab 1 first.
Daily kcal Sensitivity Matrix
Daily calorie needs by weight and life stage using your current activity & condition settings. Your profile is highlighted in gold.
Calculate in Tab 1 first.
Monthly Cost by Food Mix
Estimated monthly cost for each food mix strategy at your current caloric density and prices.
Foods Toxic to Cats
Cats have unique sensitivities. Never feed these to your cat.
All LiliesSevere kidney failure — even pollen or vase water is deadly
Onions & GarlicHeinz body anemia; toxic cooked or raw
Raw Fish (long-term)Thiamine (B1) deficiency; neurological damage
ChocolateTheobromine toxicity; cardiac arrhythmia
AlcoholCNS and liver damage; even small amounts
XylitolHypoglycemia; avoid sugar-free products
Grapes & RaisinsKidney damage (same as in dogs)
Dog Food (long-term)Lacks taurine; causes dilated cardiomyopathy
Raw Eggs (long-term)Avidin depletes biotin; bacterial risk
CaffeineRapid heart rate, tremors; fatal in large doses
Hydration: Wet vs. Dry Food
Food Type
Water Content
Daily Water Impact
Recommendation
Dry kibble
~10%
Cat must drink actively
Always provide fresh water; consider a fountain
Wet food
70–80%
Covers most daily needs
Ideal for UTI/kidney-prone cats
50/50 Mix
~40%
Partial hydration
Good balance of cost and hydration
Food Transition Schedule
Abrupt food changes cause vomiting and diarrhea. Always transition over 7–10 days.
Days
Old Food
New Food
Notes
1–3
75%
25%
Watch for GI changes
4–6
50%
50%
Some loose stools are normal
7–9
25%
75%
Acceptance should increase
10+
0%
100%
Fully transitioned
Body Condition Score (BCS) Reference
BCS is assessed by feel and visual inspection. BCS 5 is ideal for most cats.
BCS 1–2: Emaciated Ribs, spine & pelvis visible. Severe muscle loss. Urgent vet visit required.
BCS 3–4: Underweight Ribs easily felt with minimal fat. Waist very pronounced. Increase caloric intake.
BCS 5: Ideal Ribs felt but not seen. Visible waist from above. Slight abdominal tuck. Maintain current diet.
BCS 6–7: Overweight Ribs difficult to feel. Waist barely visible. Fat deposits over spine. Reduce calories 10–15%.
BCS 8–9: Obese Ribs not palpable. Heavy abdominal deposits. Serious health risk. Vet-supervised weight loss essential.
Today's Feeding Schedule
Based on your current calculator settings. Switch to the Calculator tab and adjust inputs to update.
Morning
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Evening
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How to Use This Calculator
01
Enter Your Cat's Profile
Input weight, life stage, and neuter status. Neutered adult cats need ~20% fewer calories than intact cats — this is the single biggest calculation error most owners make.
02
Set Food Type & Costs
Choose your food mix (dry, wet, or combination) and enter kcal/cup or kcal/can from your food's label. Enter bag/case prices to see accurate monthly cost breakdowns.
03
Read the Results
The hero card shows your daily portion. The stat grid breaks down dry cups, wet cans, and monthly cost. The formula pills show how RER and DER were calculated.
04
Explore Scenarios & the Matrix
Switch to the Scenarios tab to compare weight-loss vs. maintenance vs. recovery targets. The sensitivity matrix highlights how your cat's profile compares to other weights and life stages.
Understanding Cat Food
What Is Cat Food?
Cat Food is a fundamental concept that this calculator helps you understand and apply. Whether you're a beginner or experienced professional, having precise calculations at your fingertips saves time and reduces errors.
Why It Matters
Understanding cat food helps you make informed decisions backed by data rather than guesswork. Small miscalculations can compound into significant errors, making accurate tools essential for planning and analysis.
How It Works
The Cat Food Calculator — How Much to Feed Your Cat applies established formulas and methodologies to your specific inputs. Results update in real-time, letting you experiment with different scenarios to find the optimal approach for your situation.
Tips & Best Practices
Start with realistic values — use actual data when available rather than rough estimates for more meaningful results.
Compare scenarios — try different input combinations to understand how each variable affects the outcome.
Save your work — use the Share button to bookmark specific calculations for future reference.
Consult professionals — for critical decisions, use calculator results as a starting point and verify with a qualified expert.
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Frequently Asked Questions
Basics How often should I feed my cat?
Adult cats do best with 2 measured meals per day. Kittens under 6 months need 3–4 feedings. Diabetic cats need meals timed with insulin injections. Avoid free-feeding dry kibble unless your cat demonstrably self-regulates.
Advanced Is taurine deficiency a real concern?
Yes. Taurine deficiency causes dilated cardiomyopathy (heart disease) and retinal degeneration in cats. Commercial cat foods must be taurine-fortified. Never feed dog food to cats long-term — it is not adequately taurine-supplemented.
Basics Can cats be vegetarian or vegan?
No. Cats are obligate carnivores and cannot synthesize nutrients found only in animal tissue. Plant-based diets cause severe deficiencies and are considered harmful by virtually all veterinary organizations.
Strategy Why is my cat always hungry despite eating enough?
Constant hunger can indicate hyperthyroidism, diabetes, intestinal parasites, or food too low in protein/fat. If your cat seems hungry on calculated portions, consult your veterinarian.
Basics When should I switch from kitten to adult food?
Switch at 12 months for most breeds, 18–24 months for large breeds. Kitten food is higher in protein, fat, and calories for growth. Continuing kitten food past this point often leads to obesity.
Advanced How does pregnancy affect a cat's feeding needs?
Pregnant cats need 25–50% more calories in the last 3 weeks of pregnancy and up to 4x normal calories during nursing. Feed high-quality kitten food during this period for its higher caloric and nutrient density.
Basics What does the sensitivity matrix in the Scenarios tab show?
The matrix shows estimated daily calorie needs across 5 common weights and 5 life stages (Kitten, Neutered Adult, Intact Adult, Senior, Pregnant), using your current activity and body condition settings. Your current profile cell is highlighted in gold.
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Formula & Methodology
Step 1
RER = 70 × (weight kg)^0.75
Resting Energy Requirement — metabolic baseline at complete rest.
RERResting Energy Requirement — caloric baseline for a cat at complete rest.
DERDaily Energy Requirement — total daily calories including all activity and life stage factors.
Obligate CarnivoreCats require taurine, arachidonic acid, and vitamin A found only in animal tissue — plant-based diets are harmful.
TaurineEssential amino acid cats cannot synthesize. Deficiency causes heart disease (DCM) and blindness. All commercial cat foods must be taurine-fortified.
Neutered MultiplierNeutering reduces metabolic rate ~20–25%. The standard RER multiplier drops from 1.2 (intact adult) to 1.0 (neutered adult).
BCSBody Condition Score (1–9 scale). BCS 5 is ideal. Used by vets to assess body fat by visual inspection and palpation.
Prioritize wet food for hydration. Annual kidney function bloodwork recommended.
Related Calculators
Related Guides & Articles
Feline Nutrition: Feeding Your Cat Correctly
Cats are obligate carnivores with nutritional requirements that differ fundamentally from dogs and humans. They cannot synthesize essential nutrients like taurine and arachidonic acid — these must come from animal protein. Getting the feeding amount right is critical: obese cats face diabetes, hepatic lipidosis, and joint disease, while underweight cats may be signaling hidden illness.
Why Neuter Status Matters More Than Most Owners Realize
Neutering reduces a cat's metabolic rate by 20–25%. The most common post-neuter mistake is continuing to feed the same pre-surgery amount. A 4.5 kg neutered adult cat needs ~218 kcal/day — about 20% less than an intact cat of the same weight. This single factor is responsible for the majority of feline obesity cases in pet cats.
Wet vs. Dry Food: The Hydration Question
Cats evolved as desert predators who obtained most water from prey. Their thirst drive is naturally low. Dry kibble forces cats to rely on active water drinking they often won't do sufficiently, contributing to urinary tract issues and chronic kidney disease (the leading cause of death in cats over 10). Many veterinary nutritionists recommend wet food or a mixed diet, especially for older cats.
Measuring Matters: Why Cups Are Inaccurate
Standard measuring cups can be inaccurate by 20% depending on how kibble is scooped. For best results, use a kitchen scale and weigh food in grams rather than scooping by volume. Check the kcal/cup value on your food's packaging and enter it into this calculator for the most accurate portions.