What this calculator tells you
If you have ever asked, “How many calories do I burn a day?”, you are really asking for your Total Daily Energy Expenditure (TDEE). TDEE is the estimated number of calories your body uses in a full day, including resting metabolism, movement, exercise, and digestion.
This calculator estimates your daily calorie burn in two steps:
- Step 1: Estimate your Basal Metabolic Rate (BMR), the calories needed at complete rest.
- Step 2: Multiply BMR by your activity level to estimate full-day calorie expenditure.
How the formula works
BMR (Mifflin-St Jeor Equation)
The calculator uses the widely accepted Mifflin-St Jeor equation:
- 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
TDEE
TDEE = BMR × Activity Factor. The activity factor reflects how physically active you are during a typical week.
Why your real calorie burn may differ
Any calculator is an estimate, not a lab test. Your actual daily burn changes based on:
- Genetics and hormone levels
- Body composition (muscle vs. fat mass)
- Sleep quality and stress
- Non-exercise movement (walking, standing, chores)
- Thermic effect of food (protein usually burns more calories during digestion)
A practical approach is to use this number as your starting point, then track your body weight for 2–4 weeks and adjust intake based on trends.
How to use your result
For weight maintenance
Eat around your estimated TDEE. If your body weight is stable over several weeks, your estimate is likely close.
For fat loss
A common target is 300–500 calories below TDEE. This usually creates steady fat loss while preserving energy and training quality.
For muscle gain
A small surplus of 150–300 calories above TDEE is typically enough for lean growth, especially when paired with progressive strength training.
Tips for better accuracy
- Pick the activity level that reflects your normal routine, not your best week.
- Use morning body weight averages (3–7 days) instead of a single daily weigh-in.
- Track food honestly for at least 14 days before making large calorie changes.
- Recalculate after major weight changes (every 5–10 lb or 2–5 kg).
Quick FAQ
Is this the same as resting calories?
Not exactly. Resting calories are your BMR. Daily calories burned include BMR plus all activity and digestion.
Do workouts matter more than daily movement?
Both matter, but many people underestimate non-exercise movement. Walking, standing, and general activity can significantly affect total burn.
Should I eat back exercise calories?
It depends on your goal and tracking method. If your trend data is reliable, you can adjust intake based on weekly results rather than single workouts.
Note: This tool is for educational use and does not replace medical advice. If you have metabolic, thyroid, or other health conditions, consult a qualified professional.