Calorie Calculator National Health

This calorie calculator uses the National Health Service (NHS) guidelines to help you determine your daily calorie needs based on your age, gender, height, weight, and activity level. Understanding your calorie requirements is essential for maintaining a healthy weight and achieving your fitness goals.

How to Use This Calculator

To use this calorie calculator, follow these simple steps:

Enter your age in years.
Select your gender (male or female).
Enter your height in centimeters.
Enter your weight in kilograms.
Choose your activity level from the dropdown menu.
Click the "Calculate" button to see your results.

The calculator will display your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE), which are key indicators of your daily calorie needs.

Formula Used

The calculator uses the Mifflin-St Jeor equation, which is widely recognized for its accuracy in estimating calorie needs. The formulas are as follows:

// For men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5 // For women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161 // Activity multipliers: Sedentary: 1.2 Lightly active: 1.375 Moderately active: 1.55 Very active: 1.725 Extra active: 1.9 TDEE = BMR × activity multiplier

Where:

BMR = Basal Metabolic Rate (calories burned at rest)
TDEE = Total Daily Energy Expenditure (total calories burned per day)

Interpreting Your Results

Your results will show two key numbers:

BMR: This is the number of calories your body needs to perform basic functions like breathing, circulation, and digestion while at complete rest.
TDEE: This is the total number of calories your body needs to sustain itself over a 24-hour period, including physical activity.

To maintain your current weight, you should consume approximately your TDEE. If you want to lose weight, you should consume fewer calories than your TDEE. If you want to gain weight, you should consume more calories than your TDEE.

Remember that individual results may vary based on factors like muscle mass, body composition, and overall health. Consult with a healthcare professional for personalized advice.

Worked Example

Let's calculate the calorie needs for a 30-year-old woman who is 165 cm tall, weighs 60 kg, and is moderately active.

Calculate BMR:
BMR = (10 × 60) + (6.25 × 165) - (5 × 30) - 161 BMR = 600 + 1031.25 - 150 - 161 BMR = 1320.25 calories
Calculate TDEE:
TDEE = 1320.25 × 1.55 TDEE = 2043.43 calories

This woman should consume approximately 2043 calories per day to maintain her current weight.

Frequently Asked Questions

What is the difference between BMR and TDEE?: BMR is the number of calories your body needs to perform basic functions at rest, while TDEE is the total number of calories your body needs to sustain itself over a 24-hour period, including physical activity.
How accurate is this calculator?: This calculator uses the Mifflin-St Jeor equation, which is widely recognized for its accuracy in estimating calorie needs. However, individual results may vary based on factors like muscle mass, body composition, and overall health.
Can I use this calculator to lose weight?: Yes, you can use this calculator to determine your calorie needs and create a deficit by consuming fewer calories than your TDEE. However, it's important to consult with a healthcare professional before starting any weight loss program.
What if I'm pregnant or breastfeeding?: Pregnant and breastfeeding women have different calorie needs. This calculator does not account for these special circumstances. Consult with a healthcare professional for personalized advice.
How often should I use this calculator?: You can use this calculator as often as needed, especially if you're making significant changes to your diet, exercise routine, or lifestyle. However, it's generally recommended to reassess your calorie needs every few months.