How many calories should I eat to lose weight safely?

A deficit of 500-750 calories per day leads to 1-1.5 lbs of weight loss per week, which is considered safe and sustainable. Women should generally not go below 1,200 calories and men below 1,500 without medical supervision.

Are all calories the same?

Calorically yes, but nutritionally no. 200 calories of broccoli and 200 calories of candy provide the same energy but vastly different nutrients, satiety, and hormonal responses. Quality matters as much as quantity for health.

How accurate are calorie calculators?

They provide estimates within about 10-15% accuracy. Individual metabolic rates vary based on genetics, muscle mass, hormones, and other factors. Use the calculator as a starting point and adjust based on your actual results over 2-4 weeks.

Should I count calories?

Calorie counting can be a useful short-term tool to build awareness about portions and food composition. Long-term, many people transition to intuitive eating or simpler methods like portion control using hand measurements.

Do I burn more calories in cold weather?

Slightly. Your body expends extra energy to maintain core temperature in cold environments. However, the increase is modest (usually 100-200 extra calories) and is often offset by reduced physical activity during cold months.

Calorie Calculator

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What Is a Calorie Calculator?

A calorie calculator estimates how many calories your body needs each day to maintain your current weight — a number known as your Total Daily Energy Expenditure (TDEE). It accounts for your age, gender, height, weight, and how active you are, then uses the scientifically validated Mifflin-St Jeor equation to arrive at your Basal Metabolic Rate (BMR). From there, your activity level scales the result to reflect real-world energy burn.

Knowing your TDEE is the single most important starting point for any nutrition goal. Whether you want to lose fat, build muscle, or simply eat the right amount to stay where you are, everything else — macros, meal timing, food choices — sits on top of this calorie foundation. Without it, you're guessing. With it, you have a personalized, data-driven target to build your plan around.

How to Use This Calculator

1Enter your age, select your gender, then input your height and weight in your preferred units.
2Choose the activity level that best describes your typical week — from mostly sitting to training twice a day.
3Click Calculate to instantly see your BMR and daily maintenance calories (TDEE).
4Review the weight-goal breakdown to find calorie targets for cutting, maintaining, or bulking.

The Formula Behind the Numbers

Mifflin-St Jeor BMR:
  Men:   BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
  Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

TDEE = BMR × Activity Multiplier:
  Sedentary (desk job):           × 1.2
  Lightly active (1–3x/week):     × 1.375
  Moderately active (3–5x/week):  × 1.55
  Very active (6–7x/week):        × 1.725
  Extra active (2x/day):          × 1.9

For weight loss: subtract ~500 cal/day from TDEE (roughly 1 lb/week loss). For weight gain: add 250–500 cal/day. Avoid going below 1,200 cal/day for women or 1,500 cal/day for men without medical supervision.

Worked Examples

30-year-old woman, 65 kg, 165 cm, moderately active

BMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161 = 650 + 1,031.25 − 150 − 161 = 1,370 cal. TDEE = 1,370 × 1.55 ≈ 2,124 cal/day. To lose ~1 lb per week, she would target around 1,624 cal/day.

25-year-old man, 80 kg, 180 cm, lightly active

BMR = (10 × 80) + (6.25 × 180) − (5 × 25) + 5 = 800 + 1,125 − 125 + 5 = 1,805 cal. TDEE = 1,805 × 1.375 ≈ 2,482 cal/day. To build lean muscle with a modest surplus, he could aim for around 2,732–2,982 cal/day.

45-year-old woman, 70 kg, 160 cm, sedentary

BMR = (10 × 70) + (6.25 × 160) − (5 × 45) − 161 = 700 + 1,000 − 225 − 161 = 1,314 cal. TDEE = 1,314 × 1.2 ≈ 1,577 cal/day. Adding even light exercise a few days a week would meaningfully raise this number.

Frequently Asked Questions

How accurate is a calorie calculator?▾

The Mifflin-St Jeor equation is one of the most rigorously validated BMR formulas in nutrition science and is accurate to within ±10% for most people. Real-world variation comes mainly from the activity multiplier — most people overestimate how active they are. Use the result as a starting target, track your weight for 2–3 weeks, and adjust by 100–200 cal/day if needed.

What is the difference between BMR and TDEE?▾

Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest — just to keep your organs running, your blood pumping, and your temperature stable. Your Total Daily Energy Expenditure (TDEE) layers your actual activity on top of that, multiplying BMR by a factor that reflects how much you move throughout the day. TDEE is the number you actually need to match your food intake against.

How many calories do I need to lose 1 pound per week?▾

One pound of body fat contains roughly 3,500 calories. To lose one pound per week, you need a daily calorie deficit of about 500 calories (3,500 ÷ 7 = 500). The easiest way to achieve this is to eat 300–400 fewer calories than your TDEE while adding enough activity to burn the remaining 100–200. Gradual deficits preserve more muscle than crash dieting.

Do I need to count calories every day?▾

Not necessarily — and for most people, doing it every single day long-term leads to burnout. Calorie counting is most useful as a short-term education tool: spend 2–4 weeks logging to learn what a balanced plate actually looks like for your body. After that, many people can maintain their goals intuitively. That said, periodic check-ins during a cut or bulk can help you stay on track.

What happens if I eat too few calories?▾

Eating significantly below your needs — especially below 1,200 cal/day for women or 1,500 cal/day for men — triggers adaptive thermogenesis: your metabolism slows, muscle breakdown accelerates, energy drops, and hormones shift in ways that make long-term fat loss harder, not easier. Sustainable deficits of 300–500 cal/day produce steady results without these drawbacks. If you suspect you need a very low intake for medical reasons, consult a registered dietitian.