Free Calorie Calculator: Calculate Your Daily Calorie Needs
Estimate your basal metabolic rate (BMR) and total daily energy expenditure (TDEE) in a few steps. Everything is calculated in your browser. Nothing you enter is sent or stored. For adults aged 18 and older.
Your estimated results
What these numbers mean
BMR is an estimate of the energy your body uses at rest. TDEE adds the energy you use moving through the day, and is the figure most often used as a maintenance estimate.
These are estimates, not exact measurements. The goal figure is an illustrative example, not a personalised medical prescription. Individual nutritional needs vary, so a lower or higher number is not automatically right for you. A doctor or registered dietitian can give individual guidance.
Health information notice
This calculator is for education only and is not medical advice. It is for adults aged 18 and older and is not intended for pregnancy, breastfeeding, eating disorders, or medical conditions that need individualised nutrition guidance. Speak with a qualified healthcare professional before making major changes to your eating or activity.
What Is a Calorie Calculator?
A calorie calculator estimates how much energy your body uses in a day, based on details such as age, height, weight and activity. Most online calculators, including this one, use a predictive equation. They give a starting estimate rather than a measured value, so treat the result as a reference point you can compare with your own experience over time.
If you searched for a daily calorie needs calculator or a daily calorie intake calculator, this tool covers the same ground: it shows your estimated BMR, your estimated TDEE, and an example adjustment for your chosen goal.
What Is BMR?
Basal metabolic rate (BMR) is the estimated energy your body needs at complete rest to keep basic functions running, such as breathing, circulation and cell repair. It is usually the largest share of daily energy use. A BMR calculator gives an estimate of this resting figure, not a target to eat.
What Is TDEE?
Total daily energy expenditure (TDEE) is the estimated total energy you use in a day. It combines your BMR with the energy used for daily movement, exercise and digesting food. A TDEE calculator multiplies BMR by an activity factor to approximate this total. When your intake matches your TDEE over time, body weight tends to stay broadly stable.
How Does the Calculator Work?
The calculator uses the Mifflin-St Jeor equation, a widely used formula for estimating resting energy needs in adults. Weight is in kilograms, height in centimetres and age in years. Imperial entries are converted automatically.
- Female equation: (10 × weight) + (6.25 × height) − (5 × age) − 161
- Male equation: (10 × weight) + (6.25 × height) − (5 × age) + 5
TDEE is then BMR × an activity multiplier: sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, extra active 1.9. The goal examples subtract 300 kcal (gradual loss) or add 250 kcal (gradual gain) to TDEE. These adjustments are illustrations only.
How to Interpret Your Results
- Treat the numbers as a range. Real needs can differ from any equation, so the true figure may sit above or below your result.
- Track and adjust. Compare the estimate with how your weight, energy and hunger actually change over several weeks.
- Choose your activity level honestly. Picking a level that is too high is a common reason estimates run high.
- Do not follow a number blindly. Nutritional needs vary by person, and a calculator cannot account for your health history.
Factors That Affect Daily Energy Needs
Body size and composition, age, sex, daily movement, exercise, sleep, and some medical conditions and medicines can all influence how much energy you use. Muscle mass, for example, is not captured by this formula. Two people with the same inputs can have different real needs.
Healthy Eating and Lifestyle Guidance
Calories are only one part of nutrition. Food quality, protein, fibre, hydration, regular movement, sleep and stress management all matter for how you feel. Aim for varied, mostly minimally processed foods and sustainable habits rather than short-term extremes.
Frequently Asked Questions
How accurate is a calorie calculator?
It provides an estimate. Predictive equations are reasonable for many adults, but individual needs differ, so use the result as a starting point and adjust based on your own experience.
What is the difference between BMR and TDEE?
BMR is the estimated energy used at rest. TDEE includes BMR plus the energy used for daily activity and exercise, so it is always higher.
Which activity level should I choose?
Choose the level that matches your typical week, including your job. If you are between two levels, the lower one is often the more realistic choice.
Why does the goal result use 300 or 250 kcal?
They are simple illustrative examples of a modest change from maintenance. They are not personalised recommendations and do not predict any result.
Can I use this while pregnant, breastfeeding or with a medical condition?
No. This tool is not designed for those situations, or for people with eating disorders. Please seek individual guidance from a healthcare professional.
Is my information stored?
No. Calculations run in your browser, and nothing you enter is sent to a server or saved.