Fitness
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Calorie Calculator.
Calculate daily calorie needs for weight goals
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Daily Energy Expenditure
This calculator estimates how many calories your body uses in a day, based on your size, age, and how active you are. Use it as a starting point for planning your intake.
Your Daily Calorie Needs
BMR
1649 cal/day
Calories burned at complete rest
TDEE
2556 cal/day
Calories burned including activity
Calorie Targets by Goal
Weight loss
Weight gain
Important Notes
- These figures are estimates; your real needs may differ by 10% or more.
- Track your weight and intake for a few weeks, then adjust to what you see.
- Very low intakes can leave you short on nutrients — check with a professional first.
- Resistance training helps you keep muscle while losing weight.
- Stay hydrated; thirst is easily mistaken for hunger.
How to Use the Calorie Calculator
The calculator works out your basal metabolic rate and scales it by your activity level to estimate daily calorie needs.
- Enter your age and gender. Both affect your metabolic rate, so accurate values give a closer estimate.
- Add your weight and height. Switch between metric and imperial units to match how you normally measure.
- Pick your activity level. Choose the option that matches a typical week, not your best week.
- Choose a target. Use the maintenance figure to hold your weight, or a loss or gain target to change it.
Understanding BMR and TDEE
Basal metabolic rate (BMR) is the energy your body uses at complete rest to run essential functions like breathing, circulation, and cell repair. It typically accounts for most of the calories you burn in a day.
Total daily energy expenditure (TDEE) is your BMR plus everything else: walking, working, exercising, and digesting food. This is the number to compare against your intake when planning a goal.
This calculator uses the Mifflin-St Jeor equation, which is widely regarded as one of the more accurate predictive formulas for healthy adults. It remains an estimate — individual metabolism varies.
Calories and Weight Change
Weight changes when your intake differs from what you burn over time. A deficit of roughly 500 calories a day tends to produce around 0.45 kg (1 lb) of loss per week, though the rate slows as you get lighter.
Practical Tips
- Aim for a moderate deficit. Smaller deficits are easier to sustain and tend to preserve more muscle than aggressive ones.
- Prioritise protein. Protein keeps you fuller for longer and helps protect lean mass while you lose weight.
- Weigh your food at first. Portion estimates drift over time; a few weeks of weighing recalibrates them.
- Keep lifting. Resistance training signals your body to hold on to muscle during a deficit.
- Expect fluctuations. Water, salt, and digestion move the scale daily — judge progress by weekly averages.
- Recalculate as you go. Your needs fall as your weight does, so update your target every few kilograms.
Activity Level Guidelines
Sedentary
A desk job and little deliberate exercise. Most of the day is spent sitting.
Lightly active
Light exercise or sport one to three days a week, or a job with some walking.
Moderately active
Moderate exercise three to five days a week, such as regular gym sessions or team sport.
Very active
Hard exercise six to seven days a week, or training on most days.
Extra active
Hard daily training plus a physically demanding job, or twice-daily sessions.
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FAQs
How many calories should I eat per day?
Daily calorie needs vary by age, gender, weight, height, and activity level. On average, adult women need 1,600-2,400 calories and men need 2,000-3,000 calories. Use our calculator for personalized recommendations.
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the calories your body burns at rest. TDEE (Total Daily Energy Expenditure) is your BMR plus calories burned through activity. TDEE represents your total daily calorie needs.
How many calories should I eat to lose weight?
For safe weight loss, create a calorie deficit of 500-750 calories per day, which typically results in 1-1.5 pounds of weight loss per week. Never go below 1,200 calories (women) or 1,500 calories (men) without medical supervision.
Does the calculator account for exercise?
Yes, our calculator includes activity level factors ranging from sedentary to very active. Your TDEE calculation incorporates your exercise habits to provide accurate calorie recommendations.
How to Use the Calorie Calculator
Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) to determine your daily calorie needs for weight loss, maintenance, or muscle gain.
- Enter your age, gender, weight, and height.
- Select your activity level from sedentary to very active.
- Choose your preferred unit system (metric or imperial).
- Review your BMR (calories burned at rest).
- See your TDEE (total daily calories including activity).
- Use the calorie targets for different goals (weight loss, maintenance, gain).
Calorie Calculation Formulas
The calculator uses the Mifflin-St Jeor equation, considered one of the most accurate BMR formulas.
BMR Formula (Men)
Accounts for higher muscle mass in men typically.
Example:
Input: Male, 30 years, 70 kg, 175 cm
Calculation: BMR = 10 × 70 + 6.25 × 175 - 5 × 30 + 5 = 700 + 1093.75 - 150 + 5
Result: BMR = 1,648.75 calories/day
BMR Formula (Women)
Includes adjustment factor for typically lower muscle mass in women.
Example:
Input: Female, 30 years, 60 kg, 165 cm
Calculation: BMR = 10 × 60 + 6.25 × 165 - 5 × 30 - 161 = 600 + 1031.25 - 150 - 161
Result: BMR = 1,320.25 calories/day
TDEE Calculation
Activity factors: Sedentary (1.2), Light (1.375), Moderate (1.55), Active (1.725), Very Active (1.9).
Example:
Input: BMR = 1,648, Moderate activity (1.55)
Calculation: TDEE = 1,648 × 1.55
Result: TDEE = 2,554 calories/day
Real-World Use Cases
Understanding your calorie needs is essential for achieving any weight or fitness goal.
Weight Loss Planning
Create a calorie deficit by eating 500-750 calories below TDEE for safe weight loss.
Example: TDEE of 2,200 calories - eat 1,700 calories daily to lose ~1 pound per week
Muscle Gain Planning
Eat 300-500 calories above TDEE to support muscle growth.
Example: TDEE of 2,200 calories - eat 2,500-2,700 calories daily for muscle gain
Weight Maintenance
Eat at TDEE to maintain current weight.
Example: TDEE of 2,200 calories - eat 2,200 calories daily to maintain weight
Meal Planning
Plan daily meals based on calorie targets from the calculator.
Example: Breakfast 500 cal, Lunch 600 cal, Dinner 700 cal, Snacks 400 cal = 2,200 total
Fitness Program Design
Match nutrition to training intensity and goals.
Example: High-intensity training days may require higher calorie intake than rest days
Tips & Best Practices
Tips
- Be honest about your activity level - overestimating leads to eating too many calories.
- Track your intake for 1-2 weeks and adjust based on actual results.
- Don't go below 1,200 calories (women) or 1,500 calories (men) without medical supervision.
- Increase activity level gradually rather than drastically reducing calories.
- Reassess your calorie needs every 4-6 weeks as your weight and activity change.
- Consider macro distribution alongside total calories for optimal results.
Common Mistakes to Avoid
- Underestimating activity level and overeating relative to actual energy expenditure.
- Creating too large a calorie deficit, leading to muscle loss and metabolic slowdown.
- Not accounting for weekends or special occasions in calorie planning.
- Using sedentary BMR multipliers when you're actually active.
- Not adjusting calorie targets as you lose weight or change activity levels.
Related Resources
Related Calculators
Cite this calculator
Canonical URL: https://mathify.one/en/fitness/calorie
Cite as: Mathify. (2026). Calorie Calculator. https://mathify.one/en/fitness/calorie
Use Cases
Weight Management Planning
Determine your daily calorie needs to create a plan for losing, gaining, or maintaining weight.
Example: Find your maintenance calories, then subtract 500 to aim for about 1 lb loss per week.
Fitness Goal Setting
Set a daily calorie target that aligns with your fitness objectives, whether you're training for an event or building muscle.
Example: If you're active and want to gain muscle, set a target above your estimated burn.
Frequently Asked Questions
- How does the calorie calculator estimate daily burn?
- It uses your personal details and activity level to estimate your total daily energy expenditure (TDEE), which is the number of calories you burn per day.
- Can I use this calculator to lose weight?
- Yes, you can set a target based on your goal. For weight loss, a common approach is to create a calorie deficit by eating fewer calories than your estimated burn.
- Is this calculator accurate?
- It provides an estimate based on standard formulas. Individual metabolism varies, so use it as a starting point and adjust based on your results.
Tips & Common Mistakes
Tips
- Be honest about your activity level to get a more accurate estimate.
- Recalculate your calorie needs as your weight changes.
- Use the target as a guideline, not a strict rule, and listen to your body.
- Combine with a balanced diet and regular exercise for best results.
Common Mistakes to Avoid
- Overestimating activity level, which can lead to a higher calorie target than needed.
- Setting an extreme calorie deficit that is unsustainable and unhealthy.
- Ignoring the difference between total calories and macronutrient quality.
Last updated: August 13, 2026