APOP Calculators
Dog & cat calculators for feeding and weight management
Choose an APOP calculator to estimate adult maintenance calories and food portions, add up current calorie intake, check treats, compare breed weight ranges, review activity, or track weight change.
Free tools for pet owners, alongside clinical nutrition and weight-management calculators for veterinary teams. Select Dog or Cat when a tool is species-specific.
Pet Owner Calculators
Start with what you want to estimate. Dog and cat buttons appear only where the tool is species-specific.
Adult Daily Feeding Calculators
Estimate daily calories and food portions for weight maintenance in healthy, fully grown adult dogs and cats.
Pet Daily Calorie Intake Estimator
Add up calories from meals, treats, and other extras to estimate how much your dog or cat eats each day. This is an intake estimate, not a feeding target.
Treat Calorie Calculator
See how treats and extras can add up in your pet's daily calorie budget.
Dog & Cat Breed Weight Ranges
Compare your dog or cat's current weight with a typical adult range for the selected breed. Breed ranges are general references, not individual ideal-weight targets.
Dog or Cat to Human Weight Comparison
Translate extra pet weight into a more familiar comparison to make small gains easier to understand.
Dog Walking Calorie Estimator
Record a completed walk and check average pace. For a steady brisk walk within the supported reference conditions, the tool also shows an approximate calorie amount.
Pet Weight Recheck Tool
Compare two weigh-ins to estimate weight change and see when a recheck or veterinary follow-up may be needed.
Veterinary Team Calculators
Clinical tools for veterinary-guided nutrition, calorie calculation, and structured weight-management planning.
Veterinary RER/MER Calculator
Estimate RER and MER from current body weight as a clinical starting reference. Use the Step-by-Step Weight Loss Planner for active weight-loss planning.
Step-by-Step Weight Loss Planner
Build a structured plan with estimated ideal weight, weight-loss targets, and recheck guidance.
Ideal Body Weight Estimator
Estimate an individual dog or cat target weight from current weight and body condition score.
Frequently Asked Questions
Quick answers about body condition, calorie estimates, treats, and tracking your pet's weight.
These tools provide educational estimates and tracking support. They do not replace an individualized nutritional assessment or feeding plan from your veterinary team.
Before You Calculate
What is a Body Condition Score, and why does it matter?
Body Condition Score, or BCS, is a visual and hands-on assessment of body fat. It helps identify whether a pet is below ideal body condition, at an ideal body condition, or carrying excess body fat. Body weight alone cannot show whether a particular weight is appropriate for an individual pet.
Muscle Condition Score, or MCS, assesses muscle mass rather than body fat. BCS and MCS should be considered together because a pet can carry excess body fat and still have muscle loss. Review the APOP Body Condition Score Charts and Muscle Condition Score guide when interpreting calorie and weight results.
How should I use the calorie estimate?
These calculators use established veterinary equations to estimate energy needs. The result is a starting estimate, not an exact feeding prescription. Actual calorie needs can vary with life stage, activity, body condition, muscle condition, health, environment, and individual metabolism. Monitor body weight, BCS, and MCS, and adjust intake with your veterinary team when needed.
What is the difference between the Adult Daily Feeding Calculators and the Veterinary RER/MER Calculator?
Both use the Resting Energy Requirement equation and maintenance factors used in veterinary nutrition. The adult dog and cat feeding calculators are owner-facing weight-maintenance tools that also turn the calorie estimate into food portions. The Veterinary RER/MER Calculator is a clinical current-weight starting reference. It does not create an individualized active weight-loss prescription.
Feeding and Weight Management
How many calories does my dog need each day?
There is no single calories-per-pound amount that fits every dog. The Adult Dog Daily Feeding Calculator provides a weight-maintenance starting estimate for healthy, fully grown adult dogs at a veterinary-confirmed ideal body condition. It is not a weight-loss calculator.
How many calories does my cat need each day?
There is no single daily calorie amount that fits every cat. The Adult Cat Daily Feeding Calculator provides a weight-maintenance starting estimate for healthy, fully grown adult cats at a veterinary-confirmed ideal body condition and with normal appetite. It is not a weight-loss calculator.
What percentage of my pet's diet can come from treats?
Treats, table scraps, chews, toppers, food used to give medications, and other extras should make up no more than 10% of your pet's total daily calories. Use the Treat Calorie Calculator to compare current extras with that limit.
How quickly should an overweight pet lose weight?
Weight loss should be gradual and monitored. APOP guidance targets about 3–5% of body weight per month for dogs and about 2–5% for cats. Your veterinary team may set a different pace for your pet, and their plan comes first.
See the Dog Weight Loss Guide and Cat Weight Loss Guide for species-specific detail.
Tracking Progress
How often should I weigh my pet?
Weigh your pet every 2–4 weeks during active weight loss, unless your veterinary team recommends a different schedule. After active weight loss, follow the interval your veterinary team recommends. Use the same scale whenever possible and interpret weight together with BCS and MCS.
How can I weigh my dog or cat more consistently?
Small differences in scales, timing, and handling can make a pet's weight appear to change more than it actually did. For the most useful results:
- Use the same scale for each weigh-in.
- Weigh at about the same time of day.
- Weigh before a meal when possible.
- For cats and small dogs, use a baby or veterinary scale when available.
- If using a home scale, weigh yourself holding your pet, then subtract your weight.
- Record the date, weight, diet changes, treat changes, medication changes, and activity changes.
- If a result seems surprising, repeat the measurement before changing the feeding plan.
A trend across several weigh-ins is more useful than one isolated number.
What do the Pet Weight Recheck Tool alerts mean?
The estimated monthly loss falls within the displayed APOP planning range. This does not by itself confirm that the rate is healthy or safe for an individual pet.
The entries need context, the interval is short, the measured change is small, weight increased, or estimated loss is faster than 2% of body weight per week. Confirm the measurement and review the result with your veterinary team when needed.
A date or weight may be missing or implausible, dates may be reversed, or the weights may use different units. Check the entries and measurements before acting on the result.
The result is interpretable but falls outside the monthly planning range without triggering the rapid-loss warning, or no change was measured.