Step 1: Weigh your cat.
Step 2: Find your cat(s)' Resting Energy Requirement (RER) based on their body weight.
RER = (body weight in kg)0.75 x 70
| For example:
Cat name: Soju Cat weight: 4.5kg |
RER = (body weight in kg)0.75 x 70 RER = 4.50.75 x 70 RER = 216 |
*** To calculate on your smartphone, follow the steps below:
| 1. Open the calculator app.
2. Turn your phone horizontally. This should reveal a scientific calculator. 3. Type the weight in kg. In this example, it would be 4.5. 4. Press the xy button. 5. Type in 0.75, then press the = button. 6. Press the x button, type in 70, then press the = button. 7. The answer is your RER value. In this example, it would be 216. |
Step 3: Use the RER to calculate your cat(s)' Daily Energy Requirement (DER) based on their current status.
| Status | DER (kcal/day) |
| Kitten (0 to 4 months) | 2.5 x RER |
| Kitten (5 to 12 months) | 2.0 x RER |
| Intact adult |
1.4 x RER |
| Neutered adult | 1.2 x RER |
| To gain weight | 1.8 x RER of Ideal Weight |
| To lose weight | 0.8 x RER of Ideal Weight |
| For example:
Cat name: Soju Cat weight: 4.5kg (RER = 216) Status: Neutered adult |
DER = 1.2 x RER DER = 1.2 x 216 DER = 259 kcal/day Hence, Soju requires 258 kcal daily to meet his Daily Energy Requirement (DER). |
Step 4: With DER, you can now calculate how many grams you should feed in a day.
Daily Intake(g) = (DER ÷ product kcal/100g) x 100
| For example:
Our Chicken Recipe contains 452 kcal per 100g. |
Daily Intake = (DER ÷ product kcal/100g) x 100
Daily Intake = (259 ÷ 452) x 100 Daily Intake = 57g |
*** This formula is only applicable to staple food. You may adjust the amount to maintain or achieve an ideal body condition score.