Health calculator
Calorie Calculator
Estimate daily calories based on age, height, weight, activity, and goal.
Quick answer
How many calories should I eat a day?
Estimate your resting calories (BMR) with the Mifflin–St Jeor equation, multiply by your activity level to get daily maintenance calories, then subtract about 500 a day to lose roughly 1 lb per week or add calories to gain.
BMR (men) = 10w + 6.25h − 5a + 5 • BMR (women) = 10w + 6.25h − 5a − 161 • TDEE = BMR × activity factor
⚡ Answer updates as you type · Enter = calculate · Esc = reset
The Calorie Calculator estimates daily calories based on age, gender, height, weight, activity level, and weight goal.
About this Calorie Calculator
Daily calorie needs depend on age, sex, height, weight, and how active you are. This calculator uses the Mifflin-St Jeor equation to estimate maintenance calories and target intake for losing or gaining weight.
What you'll need
- • Age
- • Sex
- • Height
- • Weight
- • Activity level
- • Goal (lose, maintain, gain)
How it works
- 1. Calculate basal metabolic rate (BMR) for resting energy.
- 2. Multiply BMR by an activity factor (1.2 sedentary to 1.9 very active).
- 3. Subtract ~500/day to lose roughly 1 lb per week, or add to gain.
Worked example
A 30-year-old woman, 165 cm, 65 kg, lightly active needs about 1,950 calories to maintain weight, or about 1,450 to lose weight gradually.
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Calorie Calculator FAQ
What is the Calorie Calculator?
The Calorie Calculator is a free online tool that helps you estimate daily calories based on age, height, weight, activity, and goal.
How do I use the Calorie Calculator?
Open the Calorie Calculator, enter the requested values, and review the instant estimate on the page.
Is the Calorie Calculator free?
Yes. The Calorie Calculator is free to use on Fast Online Calculator and does not require an account.
How many calories should I eat to lose weight?
A deficit of 500 calories per day below maintenance generally produces about 1 pound of weight loss per week.
Are these calorie numbers exact?
All formulas are estimates. Adjust your intake up or down by 100–200 calories based on actual results over 2–3 weeks.
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