What this calculator tells you
If you have ever asked, “How much calories do I burn a day?”, this calculator gives you a practical estimate. It combines your age, body size, sex, and activity level to estimate your Total Daily Energy Expenditure (TDEE), which is the number of calories your body burns in a typical day.
Your daily burn includes everything: calories used for breathing and keeping your heart beating, calories used to digest food, plus calories burned through movement and exercise. Knowing this number can help you maintain weight, lose fat, or gain muscle with better precision.
How calorie burn works
1) Basal Metabolic Rate (BMR)
BMR is the energy your body uses at rest to keep you alive. It is usually the largest part of your daily calorie burn. Most people burn a significant number of calories even if they do not exercise at all.
2) Activity and movement
Daily movement (walking, chores, standing, workouts) increases your total calorie burn. A physically active job can raise your daily energy needs substantially compared with a desk job.
3) Thermic effect of food
Digesting and processing food requires energy too. Protein-rich meals generally require more energy to process than fats and refined carbs.
Formula used in this daily calorie calculator
This calculator uses the Mifflin-St Jeor equation to estimate BMR:
- Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
- Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Then BMR is multiplied by your selected activity level to estimate TDEE (calories burned per day).
How to use your results
For weight maintenance
Eat near your estimated TDEE and monitor body weight over 2-3 weeks. If weight stays stable, your estimate is close.
For fat loss
A common starting point is 250-500 calories below maintenance per day. This usually leads to steady fat loss while keeping workouts and recovery manageable.
For muscle gain
Add about 150-350 calories above maintenance and combine that with progressive strength training and enough protein.
Choosing the right activity level
- Sedentary: Minimal movement, mostly seated.
- Lightly active: Light training or regular walking a few days per week.
- Moderately active: Structured training most days and moderate daily movement.
- Very active: Frequent training with high weekly activity.
- Extra active: Hard training and/or a physically demanding job.
Be honest with activity level selection. Overestimating activity is one of the most common reasons calorie targets feel “wrong.”
Tips to make your calorie estimate more accurate
- Track body weight at the same time each day and use weekly averages.
- Keep steps fairly consistent when testing a calorie target.
- Measure food portions carefully for at least 2 weeks.
- Recalculate after notable weight changes (5-10 lb or 2-5 kg).
- Use trends, not single-day fluctuations, to make adjustments.
Frequently asked questions
Is this exact?
No calculator is exact for everyone. Think of it as a high-quality starting estimate. Your real maintenance calories can be higher or lower based on genetics, muscle mass, sleep, stress, and daily movement.
Why did my result change after switching units?
It should be nearly the same. Minor differences can happen due to rounding when converting pounds/feet/inches into kilograms/centimeters.
Should I eat back exercise calories?
Since TDEE already includes activity based on your selected level, many people do not need to “eat back” extra exercise calories. If training volume changes dramatically, adjust intake based on your weekly weight trend and performance.
Bottom line
This “how much calories do I burn a day calculator” gives you a practical estimate of daily calorie expenditure so you can set smarter nutrition goals. Use the number, monitor progress for a few weeks, and adjust gradually. Consistency and data beat guesswork every time.