Calorie Calculator
Use this free Calorie Calculator to calculate your Daily calorie needs instantly and accurately.
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Daily calories
What is a Calorie Calculator?
A Calorie Calculator determines your daily calorie needs based on your age, gender, height, weight, and activity level. It helps you figure out how many calories to eat for weight maintenance, loss, or gain.
How to calculate daily calorie needs manually (the formula)
First calculate your BMR using the Mifflin-St Jeor equation. Then multiply by your activity factor to get TDEE. Adjust for your goal: subtract 500 kcal for 0.5 kg/week loss, or add 500 kcal for gain. Target = TDEE + goal adjustment.
Example calculation
A 30-year-old man, 72 kg, 175 cm, lightly active (1.375), who wants to lose 0.5 kg/week: BMR = 1669 kcal. TDEE = 1669 × 1.375 = 2295 kcal. Target = 2295 − 500 = 1795 kcal/day.
Common mistakes
- Setting too aggressive a deficit — Cutting more than 1000 calories per day can lead to muscle loss, fatigue, and metabolic slowdown. Aim for gradual, sustainable changes.
- Ignoring activity level changes — If you start exercising more or change jobs, your calorie needs change. Update your inputs regularly.
- Not tracking intake accurately — Even the best calorie target fails if you do not measure portions. Use a food scale and logging app for accuracy.
Frequently asked questions
What are daily calorie needs?
Daily calorie needs are the total number of calories you need to maintain your current weight based on your BMR and activity level.
How many calories should I eat to lose weight?
To lose about 0.5 kg per week, subtract 500 calories from your maintenance calories. For 1 kg per week, subtract 1000 calories. Never eat below 1200 calories per day without medical supervision.
Do I need different calories on rest days?
Yes, your calorie needs are lower on rest days since you burn fewer calories through activity. Your BMR plus light activity is your rest-day baseline.
Can I eat back exercise calories?
Eating back a portion of exercise calories is fine, but most people overestimate what they burn. Aim to eat back no more than half of estimated exercise calories.
What is the difference between calories and kilocalories?
In nutrition, calories and kilocalories (kcal) are used interchangeably. One kilocalorie equals 1000 actual calories, but food labels use kcal as 'calories'.