How Many Calories Does My Cat Need Per Day Calculator
📊 Your Cat’s Daily Calorie Results
Results are estimates. Monitor body condition and adjust portions every 2–4 weeks. Consult your vet for medical conditions or rapid weight changes.
Cat Calorie Calculator – How Many Calories Does My Cat Need Per Day?
Free cat food calorie calculator using the veterinary RER formula. Instant daily calorie results for kittens, seniors, weight loss, indoor/outdoor cats, and 15+ breeds — in lbs and kg.
Quick Reference
Breed Calorie Guide
Our cat calorie calculator uses the veterinary-standard RER (Resting Energy Requirement) formula to determine your cat’s precise daily caloric needs. Whether you have a Maine Coon, Siamese, Persian, or domestic shorthair, this feline calorie calculator factors in breed, age, weight, activity level, and reproductive status — converting results directly into wet food cans and dry food cup portions. Pairs with our cat water intake calculator for complete nutritional planning.
How to Use the Cat Calorie Calculator
Follow these eight steps to get accurate, personalized daily calorie recommendations for your cat.
Enter Current Weight (lbs or kg)
Weigh your cat on a scale, or hold your cat and weigh together then subtract your own weight.
Set Target Weight
Same as current for maintenance. Lower for weight loss — consult your vet for the ideal target weight.
Enter Age and Breed
Kittens under 1 year and seniors over 7 have very different calorie needs. Breed affects metabolic rate.
Select Activity Level
Sedentary to very active. Active breeds like Bengals and Abyssinians need significantly more calories.
Spay / Neuter Status
Altered cats have 20–30% lower metabolic rates. Pregnant and nursing cats need much more.
Assess Body Condition Score
Underweight (visible ribs), ideal (ribs felt easily), overweight (ribs hard to feel), obese (no visible waist).
Calculate and Review Results
Get RER, DER, target calories, treat budget, and food portion guidelines for wet and dry food.
Convert Calories to Food Portions
Divide daily target by your food’s kcal/cup or kcal/can. Use a kitchen scale for best accuracy.
Understanding the Cat RER, DER & MER Calculator
Our cat RER calculator uses the formula recommended by the WSAVA and endorsed by the American College of Veterinary Nutrition.
Resting Energy Requirement (RER) Formula
Multiplied by a life-stage factor to get DER / MER (Daily / Maintenance Energy Requirement)
Life-stage multipliers: kittens (2.5×), intact adults (1.4×), neutered adults (1.2×), seniors (1.1×), pregnant queens (1.6×), nursing mothers (2–4×). The terms cat DER and cat MER are used interchangeably — both represent total daily calorie needs including activity level. Knowing your cat’s breed helps apply the correct metabolic multiplier.
Cat Calorie Requirements Chart by Weight (lbs)
Reference chart for neutered adult cats at moderate activity. Use the calculator above for personalized results.
| Cat Weight (lbs) | Maintenance (kcal/day) | Weight Loss (kcal/day) | Weight Gain (kcal/day) |
|---|---|---|---|
| 5 lbs (2.3 kg) | 170 | 135 | 195 |
| 6 lbs (2.7 kg) | 195 | 155 | 225 |
| 7 lbs (3.2 kg) | 220 | 175 | 250 |
| 8 lbs (3.6 kg) | 240 | 190 | 275 |
| 9 lbs (4.1 kg) | 260 | 210 | 300 |
| 10 lbs (4.5 kg) | 280 | 225 | 320 |
| 11 lbs (5.0 kg) | 300 | 240 | 345 |
| 12 lbs (5.4 kg) | 315 | 250 | 360 |
| 13 lbs (5.9 kg) | 335 | 270 | 385 |
| 14 lbs (6.4 kg) | 350 | 280 | 400 |
| 15 lbs (6.8 kg) | 370 | 295 | 425 |
| 16 lbs (7.3 kg) | 385 | 310 | 440 |
| 18 lbs (8.2 kg) | 415 | 330 | 475 |
| 20 lbs (9.1 kg) | 445 | 355 | 510 |
Cat Calorie Chart by Weight in Kilograms
For users of the cat calorie calculator in kg — answering questions like how many calories should a 4 kg cat eat or how many calories for a 5 kg cat per day. Values are for neutered adults at moderate activity.
| Cat Weight (kg) | Maintenance (kcal/day) | Weight Loss (kcal/day) | Weight Gain (kcal/day) |
|---|---|---|---|
| 2 kg (4.4 lbs) | 155 | 125 | 178 |
| 2.5 kg (5.5 lbs) | 185 | 148 | 213 |
| 3 kg (6.6 lbs) | 212 | 170 | 244 |
| 3.5 kg (7.7 lbs) | 239 | 191 | 275 |
| 4 kg (8.8 lbs) | 264 | 211 | 304 |
| 4.5 kg (9.9 lbs) | 289 | 231 | 332 |
| 5 kg (11 lbs) | 312 | 250 | 359 |
| 5.5 kg (12.1 lbs) | 335 | 268 | 385 |
| 6 kg (13.2 lbs) | 358 | 286 | 412 |
| 7 kg (15.4 lbs) | 402 | 322 | 463 |
| 8 kg (17.6 lbs) | 444 | 355 | 511 |
| 9 kg (19.8 lbs) | 484 | 387 | 557 |
| 10 kg (22 lbs) | 523 | 418 | 601 |
Daily Caloric Intake by Life Stage
Kitten (0–12 months)
A 2 kg kitten needs ~250–310 kcal/day. Feed 3–4 times daily. See our pregnancy calculator for nursing needs.
Adult Cat (1–7 years)
A healthy 10 lb indoor cat needs ~240–280 kcal/day. Outdoor cats need 10–20% more calories.
Senior Cat (7+ years)
A 12 lb senior Persian needs ~240–300 kcal/day. Monitor weight monthly and adjust accordingly.
Kitten Calorie Calculator – How Many Calories Does a Kitten Need?
Kittens need approximately 2–2.5× their RER — roughly 50–60 calories per pound per day, more than double an adult cat’s needs. Feed 3–4 meals daily during rapid growth phases.
| Kitten Age | Typical Weight | Daily Calories (approx.) | Feeding Frequency |
|---|---|---|---|
| 4–6 weeks | 0.4–0.6 kg | 90–130 kcal | 4–5× per day |
| 2–3 months | 0.8–1.2 kg | 160–220 kcal | 4× per day |
| 4–6 months | 1.5–2.5 kg | 240–360 kcal | 3–4× per day |
| 7–9 months | 2.5–3.5 kg | 280–420 kcal | 3× per day |
| 10–12 months | 3–4.5 kg | 300–450 kcal | 2–3× per day |
How Many Calories Should My Cat Eat to Lose Weight?
Safe weight loss requires a 15–20% caloric deficit below maintenance. According to the Cornell Feline Health Center, cats should lose no more than 0.5–2% of body weight per week.
Never restrict calories by more than 20% without veterinary supervision. If a cat stops eating for 2–4 days, fat mobilizes to the liver faster than it can be processed, causing life-threatening fatty liver disease (hepatic lipidosis). Always aim for gradual, monitored weight loss of no more than 2% body weight per week.
| Cat Weight | Body Condition | Maintenance | Safe Weight Loss | Target Rate |
|---|---|---|---|---|
| 10 lbs / 4.5 kg | Overweight (BCS 6–7) | 280 kcal | 224–238 kcal | 0.5–1%/week |
| 12 lbs / 5.4 kg | Overweight (BCS 6–7) | 315 kcal | 252–268 kcal | 0.5–1%/week |
| 15 lbs / 6.8 kg | Obese (BCS 8–9) | 370 kcal | 296–315 kcal | 1–1.5%/week |
| 18 lbs / 8.2 kg | Obese (BCS 8–9) | 415 kcal | 332–353 kcal | 1–2%/week |
How to Count Cat Treat Calories — The 10% Rule
Treat calories are one of the most overlooked causes of gradual cat weight gain. Veterinary nutritionists recommend treats account for no more than 10% of daily calories. Multiply maintenance calories × 0.10 to get the treat budget, then subtract from the daily total before portioning meals.
🍬 Quick Treat Budget Calculator
Common cat treats contain 1–5 calories each. A cat with a 26-calorie treat budget can have 5–25 small treats daily — but this is easy to exceed with larger training treats (up to 10 kcal each). Always check packaging and count treats toward the daily total.
Cat Food Portion Calculator – Converting Calories to Food
How Many Calories in Dry Cat Food Per Cup?
Most dry cat food contains 300–500 calories per cup. Divide your cat’s daily target by kcal/cup for portions. Example: 240 kcal/day ÷ 400 kcal/cup = 0.6 cups/day split into 2–3 meals. High-protein formulas for active breeds typically have 400–450 kcal/cup.
How Many Calories in a Can of Wet Cat Food?
Canned wet food provides 70–150 kcal per 3-oz can or 150–250 kcal per 5.5-oz can. Its 70–80% moisture content makes it excellent for weight management and urinary health. A 10-lb adult eating only wet food consumes roughly 1.5–2 standard cans daily.
| Food Type | Typical Calories | Moisture % | Best For |
|---|---|---|---|
| Dry kibble (standard) | 300–400 kcal/cup | 10% | Convenience, dental health |
| Dry kibble (high-protein) | 400–500 kcal/cup | 8% | Active breeds (Bengal, Aby) |
| Wet food, 3 oz can | 70–120 kcal/can | 75–80% | Weight loss, hydration |
| Wet food, 5.5 oz can | 150–250 kcal/can | 75–80% | Weight management |
| Raw diet (chicken-based) | ~180–220 kcal/100g | 65–70% | Carnivore nutrition (vet-supervised) |
Spayed and Neutered Cat Calorie Needs
Altered cats have 20–30% lower metabolic rates than intact cats. Reduce calories by ~25% immediately after spaying or neutering. The AVMA recommends adjusting portions within 2–4 weeks of surgery to prevent the weight gain many owners don’t anticipate.
If your cat previously needed 320 kcal/day as an intact adult, expect post-neuter needs to drop to approximately 240–260 kcal/day. Make this adjustment within 2–4 weeks of the procedure.
Indoor Cat Calorie Calculator vs Outdoor Cat
Indoor cats burn 10–20% fewer calories than outdoor cats. This is especially important for active breeds like Bengals — without daily play sessions, indoor Bengals can gain weight despite their active reputation.
| Cat Type | Activity Multiplier | Example: 10 lb neutered cat |
|---|---|---|
| Sedentary indoor | 1.0× RER | ~200 kcal/day |
| Typical indoor | 1.2× RER | ~240 kcal/day |
| Active indoor | 1.4× RER | ~280 kcal/day |
| Indoor/outdoor | 1.4–1.6× RER | ~280–320 kcal/day |
| Fully outdoor | 1.6–2.0× RER | ~320–400 kcal/day |
Breed-Specific Cat Calorie Requirements
Different breeds have notably different metabolic rates and body sizes. Not sure what breed your cat is? Try our AI cat breed identifier or random cat breed generator.
🐱 Maine Coon
Adults need 370–500 kcal/day. Males up to 500 kcal. Don’t reach full size until 3–4 years old — calorie needs stay elevated during extended growth.
🐱 Ragdoll
Need 300–450 kcal/day. Docile nature makes them prone to obesity — monitor weight closely despite their large frame.
🐱 Bengal
A 10-lb Bengal needs 280–320 kcal/day. Without enough daily activity, they gain weight easily indoors.
🐱 Persian
Low-activity, obesity-prone. A 10-lb Persian may need only 200–240 kcal/day. Wet food is often easier due to their flat face.
🐱 Siamese
Lean and highly active. An 8-lb Siamese needs ~220–265 kcal/day. Their social energy burns more than their small frame suggests.
🐱 British Shorthair
Stocky and low-activity, prone to obesity. A 12-lb British Shorthair needs ~250–315 kcal/day with careful portion control.
🐱 Norwegian Forest Cat
Needs 340–430 kcal/day. Outdoor Wegies in cold climates may need up to 500 kcal/day in winter months.
🐱 Abyssinian
Constantly in motion. An 8-lb Aby needs 240–290 kcal/day — more than similarly-sized sedentary breeds. Rarely struggles with obesity.
Cat Calories for Special Health Conditions
Standard RER/DER formulas work well for healthy cats, but medical conditions significantly change caloric needs. Always consult your veterinarian before adjusting calories for any diagnosed condition.
Calories for Diabetic Cats
Diabetic cats benefit from high-protein, low-carbohydrate diets with consistent daily calorie intake timed with insulin injections. Total calories matter less than calorie timing and macronutrient composition. Wet food and raw diets are naturally lower in carbohydrates and often recommended by veterinary nutritionists.
Calories for Cats with Chronic Kidney Disease (CKD)
CKD cats often lose weight due to decreased appetite. Adequate caloric intake is critical — slightly higher caloric density foods help ensure they eat enough while limiting phosphorus and moderating protein. Monthly weight monitoring is essential to catch early decline.
Calories for Hyperthyroid Cats
Hyperthyroid cats have an elevated metabolism and often lose weight despite eating ravenously. They may need 1.5–2× their calculated RER until thyroid levels are managed. After treatment, reduce calories promptly as metabolism normalizes to prevent rapid weight gain.
Post-Surgery and Recovery Calories
Major surgery recovery may require 10–15% more calories for 2–4 weeks. After routine spay/neuter, do the opposite — reduce by 20–25% once fully healed.
The above is for general educational purposes only. Never make significant dietary changes for a cat with a diagnosed medical condition without direct veterinary guidance. Prescription therapeutic diets may differ significantly from general calorie guidelines.
Pro Tips for Accurate Cat Calorie Management
- Use a kitchen scale: Measuring by grams is far more accurate than measuring by volume (cups)
- Weigh regularly: Check weight every 2–4 weeks and recalculate if there are changes
- Include treats: Count all treat calories — 10% maximum of daily total
- Use puzzle feeders: Cats naturally eat 10–20 small meals per day; puzzle feeders slow eating and add enrichment
- Adjust for life changes: Recalculate after spaying/neutering, illness, or significant activity changes
- Wet food for weight loss: Higher moisture content creates satiety with fewer calories per gram
- Be patient: Allow 2–3 weeks before adjusting portions — weight changes take time
- Consult your vet: Especially for weight loss programs, senior cats, and medical conditions
Example Calorie Calculations
Scenario 1: Healthy 10-lb Neutered Domestic Shorthair
RER = 70 × (4.5 kg)^0.75 ≈ 234 kcal. DER = 234 × 1.2 = ~280 kcal/day. At 400 kcal/cup: 0.7 cups/day in 2–3 meals. Treat budget: 28 kcal (~6–14 small treats).
Scenario 2: Overweight 15-lb Maine Coon — Weight Loss Plan
Maintenance: 370 kcal/day. Safe weight loss: 370 × 0.80 = 296 kcal/day. At 360 kcal/cup: 0.82 cups/day. Expected: 1–2 oz loss/week. Timeline to reach 12 lbs: ~6–8 months.
Scenario 3: 4 kg Cat (Metric)
RER = 70 × (4)^0.75 ≈ 198 kcal. DER = 198 × 1.2 = ~238 kcal/day. At 90 kcal per 85g wet food can: 238 ÷ 90 ≈ 2.6 cans/day (1 morning, 1.5 evening).
Frequently Asked Questions
A cat RER calculator determines Resting Energy Requirement — the baseline calories for basic metabolic functions at rest. Formula: RER = 70 × (weight in kg)^0.75, endorsed by the American College of Veterinary Nutrition. This is multiplied by a life-stage factor to get the DER/MER — the actual daily calorie need including activity level.
A 10-lb neutered adult cat at moderate indoor activity needs 240–280 kcal/day for maintenance. Active breeds like Bengals may need 280–300 kcal; sedentary Persians may need 200–240 kcal. Use the calculator at the top of this page for your cat’s specific breed, age, and activity level.
A 4 kg neutered adult cat needs ~264 kcal/day for maintenance (211 kcal for weight loss). A 5 kg neutered adult needs ~312 kcal/day (250 kcal for weight loss). See the full kg calorie chart above for all metric targets.
Kittens need ~2–2.5× their RER. A 2 kg kitten needs 250–310 kcal/day; a 3 kg kitten needs 370–470 kcal/day. Feed 3–4 times daily during rapid growth. Gradually transition to adult portions at 10–12 months.
Safe weight loss = 80% of maintenance calories. A cat needing 280 maintenance kcal should eat 220–225 kcal/day. Aim for 0.5–2% body weight loss per week. Faster loss risks hepatic lipidosis — a potentially fatal fatty liver disease in cats.
Multiply maintenance calories by 0.10 for the treat budget. For a 260 kcal/day cat: 26 calories for treats. Subtract from total before measuring meals: 260 − 26 = 234 kcal from meals. At 3 kcal/treat: ~8 treats maximum per day.
A healthy adult Maine Coon at 15–18 lbs needs approximately 370–450 kcal/day. Large males (18–25 lbs) may need up to 500 kcal/day. Maine Coons don’t reach full size until 3–4 years, so calorie needs stay elevated during this extended growth phase.
Yes. Indoor cats burn 10–20% fewer calories than outdoor cats due to reduced activity. An indoor Persian may need 180–220 kcal/day while an outdoor cat of similar size needs 220–260 kcal/day. For sedentary breeds, portion control and regular play sessions are essential to prevent obesity.
RER (Resting Energy Requirement) is baseline calories at rest: 70 × (weight kg)^0.75. DER (Daily Energy Requirement) and MER (Maintenance Energy Requirement) are used interchangeably — both = RER × activity/life-stage factor. Our calculator gives you all three values instantly.
Recalculate every 3–6 months or after significant life changes: spay/neuter, a 10%+ change in body weight, entering senior years (7+), or change in activity level. For cats actively losing weight, recalculate every 4–6 weeks as their weight decreases.