Darwin's Pet Food Calculator

Calculator Form

Pet name

Species

Life stage

Pet weight

Weight unit

Activity level

Feeding goal

Body condition score Use 1 to 9 scale. Five is usually ideal.

Food calories per 100g

Meals per day

Treat calories percent

Food moisture percent

Food cost per unit

Cost unit

Planning days

Transition days

Main recipe percent

Bone or calcium percent

Organ percent

Other percent

Example Data Table

Pet	Species	Weight	Calories per 100g	Meals	Goal
Buddy	Dog	25 lb	155 kcal	2	Maintain
Luna	Cat	10 lb	145 kcal	3	Maintain
Max	Dog	60 lb	170 kcal	2	Weight loss
Milo	Kitten	4 lb	150 kcal	4	Growth

Formula Used

Weight kg = pounds × 0.45359237
RER = 70 × body weight kg ^ 0.75
DER = RER × energy factor
Treat kcal = DER × treat percent ÷ 100
Food kcal = DER - treat kcal
Daily grams = food kcal ÷ kcal per gram
Per meal grams = daily grams ÷ meals per day
Period cost = daily grams ÷ 1000 × cost per kg × days
Component grams = daily grams × selected component percent ÷ total percent

How to Use This Calculator

Enter your pet name, species, life stage, and current body weight.
Choose the activity level and feeding goal.
Check your food label for calories per 100 grams.
Add the number of meals served each day.
Enter treat percentage. Keep treats modest for better control.
Add cost details to estimate daily and monthly spending.
Adjust component percentages if you prepare mixed meals.
Press the calculate button and review the result above the form.
Download the CSV or PDF file for your records.

Pet Food Planning for Everyday Health

Why Portion Planning Matters

Raw and fresh pet meals can be useful when they are measured well. A small mistake can change daily calories quickly. This is important for small dogs and cats. Their calorie needs are often lower than owners expect. A calculator gives a starting point. It helps you avoid guessing. It also makes cost planning easier.

Calories Come First

The calculator begins with resting energy requirement. This is the base calorie estimate for normal body functions. Then it applies a daily energy factor. The factor changes with species, age, activity, goal, and body score. A working dog needs more energy. A quiet indoor cat often needs less. A pet with extra weight may need a careful reduction.

Use Label Values

Always enter the calories from your own food label. Different recipes can vary a lot. Some raw meals are lean. Others contain more fat. Fat raises calorie density. Higher density means smaller gram portions. Lower density means larger portions. This is why one fixed feeding cup can be misleading.

Treats and Transitions

Treats should be counted. They can quietly replace balanced food calories. Many pets do well when treats stay near ten percent. The transition table is also helpful. Sudden food changes may upset digestion. A gradual schedule lets the pet adjust. Watch stool, appetite, thirst, and energy. Slow down the switch when needed.

Review Often

This tool is not a medical diagnosis. It is a practical planning aid. Recheck weight and body condition often. Update the form when your pet changes. Ask your veterinarian about puppies, kittens, pregnancy, illness, allergies, or prescription diets. Good feeding plans stay flexible.

FAQs

1. Is this calculator only for Darwin's food?

No. It can estimate portions for any pet food when you enter the correct calories per 100 grams from the product label.

2. What is RER?

RER means resting energy requirement. It estimates the calories needed for basic body functions before activity and life stage changes are applied.

3. What is DER?

DER means daily energy requirement. It adjusts RER for activity, age, body condition, and feeding goal.

4. Can I use this for puppies?

Yes, but puppies need careful nutrition. Use the estimate as a starting point and ask your veterinarian about growth needs.

5. Why are treats included?

Treats add calories. Counting them helps prevent overfeeding and keeps the main meal balanced.

6. What body condition score should I enter?

Use a 1 to 9 score. A score near 5 is usually ideal, while higher scores suggest extra body fat.

7. Does this replace veterinary advice?

No. It is only an estimate. Medical conditions, pregnancy, allergies, and prescription diets need professional guidance.

8. How often should I recalculate portions?

Recalculate after weight changes, activity changes, food changes, or every few weeks during a weight plan.