The Mifflin-St Jeor Calorie Calculator is a valuable tool that helps individuals determine their daily calorie needs. Whether you’re trying to maintain your current weight or plan for weight loss or gain, this calculator provides an estimate of the calories you should consume daily to achieve your goals.

**Formula:** The Mifflin-St Jeor equation is used to calculate Basal Metabolic Rate (BMR), which represents the number of calories your body needs to maintain basic functions at rest. The formula for BMR is as follows:

- For males:
`BMR = 10 * weight (kg) + 6.25 * height (cm) - 5 * age (years) + 5`

- For females:
`BMR = 10 * weight (kg) + 6.25 * height (cm) - 5 * age (years) - 161`

The daily calorie needs are calculated by multiplying the BMR by the selected activity level. The higher your activity level, the more calories you require to maintain your weight.

**How to Use:**

- Enter your age in years.
- Select your gender (male or female).
- Input your weight in kilograms.
- Specify your height in centimeters.
- Choose your activity level from the drop-down list.
- Click the “Calculate” button to get your estimated daily calorie needs.

**Example:** Suppose you are a 30-year-old female with a weight of 65 kg, a height of 160 cm, and a moderately active lifestyle (activity level of 1.55). Your estimated daily calorie needs would be:

`BMR = 10 * 65 + 6.25 * 160 - 5 * 30 - 161 = 1323.75`

`Estimated Daily Calories = BMR * Activity Level = 1323.75 * 1.55 = 2050.14`

**FAQs:**

**What is the Mifflin-St Jeor equation?**- The Mifflin-St Jeor equation is a formula used to calculate Basal Metabolic Rate (BMR), which represents the number of calories your body needs at rest.

**What is Basal Metabolic Rate (BMR)?**- BMR is the number of calories your body requires to maintain basic functions at rest, such as breathing and cell production.

**How do I determine my activity level?**- Choose the activity level that best describes your daily physical activity, from sedentary to super active.

**Can I use this calculator for weight loss or gain?**- Yes, you can use the calculator to determine the daily calorie needs for various goals. For weight loss, consume fewer calories, and for weight gain, consume more.

**Is the Mifflin-St Jeor equation accurate for everyone?**- It provides a reasonably accurate estimate, but individual variations may occur. Consult a healthcare professional for a personalized plan.

**What units should I use for weight and height in the calculator?**- Enter your weight in kilograms and your height in centimeters.

**Is this calculator suitable for pregnant or breastfeeding individuals?**- It’s best to consult a healthcare provider for specific dietary recommendations during pregnancy and breastfeeding.

**Should I round my estimated calorie needs to the nearest whole number?**- It’s generally acceptable to round to the nearest 100 calories for practical purposes.

**What if I have a very physically demanding job?**- Choose the “Super active” option for a more accurate estimate.

**Is the Mifflin-St Jeor equation suitable for athletes?**- For highly active athletes, additional adjustments may be needed based on their training intensity and volume.

**Conclusion:** The Mifflin-St Jeor Calorie Calculator is a useful tool for estimating your daily calorie needs. It’s a foundational step in planning a balanced diet and achieving your health and fitness goals. Remember that this calculator provides estimates, and individual variations exist, so it’s wise to consult a healthcare professional for personalized guidance.