Pets Β· π°π· Korea
Pet Food Portion Calculator
Dog & cat daily calories and food grams via RER Γ life-stage factor = MER formula.
About this tool
Pet Food Portion Calculator computes daily calories and food grams for dogs and cats using the international standard RER = 70 Γ BW(kg)^0.75 multiplied by a life-stage factor (1.2β3.0) for MER. Enter body weight, life stage (puppy/adult/senior/pregnant/lactating/kitten), activity level, neutering status, and the kcal/100g on the food label, and the tool returns daily kcal, daily grams, and per-meal grams. Based on NRC, AAFCO, and WSAVA guidance, it is roughly Β±15% more precise than bag-printed defaults because it accounts for activity and neutering. A weight-loss / gain mode adjusts calories toward a target, and everything runs in your browser.
Use cases
Scenario 1
First-time puppy portion
For a 4kg, 5-month-old puppy, the tool returns RER 198 Γ growth 2.0 = MER 396 kcal/day and splits it across three meals automatically.
Scenario 2
Post-neuter weight control
For a 6kg neutered cat trending overweight, drop the activity factor 1.4 β 1.2, recompute MER (~240 kcal), and re-issue food grams.
Scenario 3
Senior-dog calorie reduction
For a 12-year-old, 8kg senior dog, switch to senior factor 1.4 to slow weight gain and protect arthritic joints.
Scenario 4
Weight-loss target mode
For a 12kg overweight dog targeting 9.5kg, limit daily calories to RER Γ 1.0 and produce a staged loss schedule.
Scenario 5
Pregnant / lactating cat boost
For a 4kg pregnant + lactating queen, apply factor 3.0 (~2.5Γ normal) and add supplemental kcal per kitten in the litter.
Features
- Standard RER = 70 Γ BW^0.75 with auto life-stage factor
- Dog & cat across 7 stages (puppy/adult/senior/pregnant/lactating/kitten/adult cat)
- Neutering and activity-level correction (Β±0.2β0.4 factor)
- kcal/100g label β daily and per-meal grams
- Weight-loss / gain target mode with staged calorie path
- Result card PNG / print for vet visits and family handoff
- In-browser only β inputs never sent to a server
Frequently asked
- Q. What is RER?
- A. Resting Energy Requirement β the minimum calories needed to maintain body temperature. Computed as 70 Γ BW(kg)^0.75 and multiplied by a life-stage and activity factor to obtain MER (the actual daily need).
- Q. Why does it differ from bag-printed amounts?
- A. Bag values target an "average" pet and skew conservative. This tool corrects within Β±15% by adding activity, neutering, and life stage. Start at the lower of the two and watch the scale.
- Q. Why cut calories after neutering?
- A. Basal metabolic rate drops 20β30% while appetite stays the same or rises. Toggling the neutered switch lowers the life-stage factor (e.g., 1.6 β 1.4).
- Q. Why do puppies and kittens need so much food?
- A. Growth requires maintenance + growth energy β 2.0β3.0Γ RER. Puppies under 4 months should be fed 3β4 times a day.
- Q. What if my vet says something different?
- A. For pets with cardiac, kidney, or diabetic conditions, prescription-diet portions take precedence. This tool targets healthy pets β always defer to your vet for medical cases.
Sources / references
Related guides / blog posts
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How we run it / disclaimer
This tool is advisory and does not constitute legal, tax, medical, or financial advice. All calculations and document generation run in your browser; inputs are never sent to a server. Ads follow Google AdSense policy and are kept separate from tool accuracy.