🥗 Calorie Calculator

What is Calorie Calculator?

Your Total Daily Energy Expenditure, or TDEE, is the full number of calories your body uses in an average day once you account for movement, exercise, and general daily activity on top of resting metabolism. Rather than guessing at a calorie target from a magazine chart, this calculator builds your number from your own weight, height, and age, then layers on an activity multiplier so the figure reflects how you actually live — not a generic average that fits nobody in particular.

TDEE Formula

The calculator first works out your Basal Metabolic Rate using the Mifflin-St Jeor equation, then scales it by an activity multiplier:

Typical multipliers range from 1.2 for a mostly sedentary desk routine to 1.9 for very intense daily training; this calculator applies a moderate-activity multiplier of 1.55, suited to someone exercising a few times a week.

Worked Example

Using the same 30-year-old, 70 kg, 170 cm man from the BMR example, with moderate activity:

From that 2,591 kcal maintenance figure, the calculator also shows a rough weight-loss target (2,091 kcal, a 500-calorie daily deficit) and a weight-gain target (3,091 kcal, a 500-calorie surplus) — both based on the widely cited rule that a roughly 500 kcal/day shift corresponds to about half a kilogram of body weight change per week.

How to Use This Calculator

1. Enter your weight in kilograms.
2. Enter your height in centimetres.
3. Enter your age.
4. Click Calculate to see your maintenance, weight-loss, and weight-gain calorie figures.

Things to Keep in Mind

TDEE is an estimate, not a fixed law — actual calorie burn varies with muscle mass, sleep, stress, and how precisely "moderate activity" describes your week. Use the figure as a starting point, track your weight over two to three weeks, and adjust intake up or down based on what actually happens on the scale. For medical weight-management advice, especially around chronic conditions, consult a registered dietitian or doctor rather than relying solely on an online estimate.

Curious what your resting number looks like on its own? Try the BMR Calculator first.

Who Should Use This Calculator

This TDEE-based calculator is aimed at healthy adults who want a starting estimate for weight maintenance, gradual fat loss, or gradual muscle gain. It suits people with fairly typical activity patterns — desk workers who exercise a few times a week, homemakers with moderate daily movement, or casual gym-goers. It is a poor fit for children and teenagers (whose calorie needs are tied to growth, not just activity), pregnant or breastfeeding women (who need additional calories calculated differently by trimester or feeding stage), people managing diabetes, kidney disease, or eating disorders (who need individualised medical nutrition therapy), and elite athletes with very high training volumes, whose energy needs often exceed what a standard activity multiplier captures. If your goal involves significant, rapid, or medically supervised weight change, work with a registered dietitian who can personalise your targets rather than relying solely on this general calculator.

Frequently Asked Questions

Q: Why does eating below my TDEE lead to weight loss?
A: Your TDEE represents the calories your body burns in an average day. Eating consistently less than that forces your body to draw on stored energy (mostly fat) to make up the difference, which over time results in weight loss. Eating more than your TDEE has the opposite effect and tends to result in weight gain.

Q: Is the "500 calorie deficit equals half a kilogram a week" rule always accurate?
A: It's a widely used approximation, not a precise law. It assumes roughly 7,700 kcal per kilogram of fat, but real-world weight change is also affected by water retention, muscle changes, hormones, and how consistently the deficit is maintained — so actual results often vary somewhat from the simple math.

Q: I've been eating at the suggested calorie level for weeks but not losing weight — what's wrong?
A: This is common and usually means your actual TDEE is somewhat different from the estimate, or that portion sizes and hidden calories (cooking oil, sauces, beverages) are higher than tracked. Try logging food intake accurately for two weeks and adjusting the target by 100-200 calories based on your actual weight trend rather than the formula alone.

Q: Do I need to count every calorie precisely to see results?
A: Not necessarily. Many people do well using this number as a rough daily target while focusing on portion control, protein intake, and food quality, only tracking more precisely if progress stalls. Consistency over weeks matters more than hitting an exact number every single day.

Q: Can I use this calculator instead of seeing a dietitian for a medical weight condition?
A: No. This tool provides a general estimate for healthy adults and isn't a substitute for personalised medical nutrition advice. If you have diabetes, thyroid issues, PCOS, an eating disorder history, or are pregnant, please consult a doctor or registered dietitian for calorie guidance tailored to your condition.

Q: Why does this calculator only use one activity multiplier instead of letting me choose my activity level?
A: This version applies a moderate-activity multiplier (1.55), a practical middle-ground for people exercising a few times a week. Largely sedentary routines will burn somewhat less than shown, while very active people, including those with physically demanding jobs, likely burn meaningfully more.

More Worked Examples

Seeing the same calculation applied to different profiles helps calibrate expectations:

• 26-year-old woman, 58 kg, 160 cm: BMR ≈ 447.593 + (9.247 × 58) + (3.098 × 160) − (4.330 × 26) ≈ 1,363 kcal → TDEE at moderate activity = 1,363 × 1.55 ≈ 2,113 kcal/day
• 50-year-old man, 90 kg, 172 cm: BMR ≈ 88.362 + (13.397 × 90) + (4.799 × 172) − (5.677 × 50) ≈ 1,825 kcal → TDEE = 1,825 × 1.55 ≈ 2,829 kcal/day

Weight-loss and weight-gain figures are derived the same way — subtracting or adding 500 kcal from the maintenance TDEE.

Making the Target Practical

A daily calorie number only helps once it translates into an actual plate of food. A typical vegetarian thali — 2-3 rotis or a modest rice serving, a dal or vegetable curry, and a small bowl of curd — often lands between 600 and 800 kcal, meaning most adults need roughly three such meals plus a snack to comfortably hit a 2,000-2,600 kcal target. Rather than counting every gram, many people find it easier to keep portions consistent and adjust based on the weekly scale trend instead of recalculating daily.

📅 Last reviewed: July 2026 · Formulas verified against RBI/SEBI/IT Dept guidelines.