Calorie Calculator — TDEE, BMR & Daily Calorie Needs

Last updated: Jul 22, 2026 | Reviewed by Calkulator Team | 2 min read

Health

Find your daily calorie needs for your fitness goal

Your body burns calories just to stay alive (BMR) plus additional calories from daily activities (TDEE). To lose weight, eat 500 calories below TDEE. To gain muscle, eat 300-500 above. This calculator gives you the exact numbers.

A 500 calorie daily deficit leads to approximately 0.5 kg weight loss per week — sustainable and healthy.

Your Details

Gender

Age (years)

yrs

Weight (kg)

Height (cm)

Activity Level

Mifflin-St Jeor Formula (BMR)

Male: BMR = 10�W + 6.25�H - 5�A + 5

Female: BMR = 10�W + 6.25�H - 5�A - 161

TDEE = BMR — Activity Multiplier

Daily Calories (TDEE)

—

BMR: — (calories at complete rest)

BMR

—

Weight Loss (-500 kcal)

—

~0.5 kg/week loss

Weight Gain (+500 kcal)

—

~0.5 kg/week gain

Protein Target

—

0.8g per lb body weight

Calorie Goals

Macro Breakdown (40/30/30 of TDEE)

Macro	Calories	Grams
Carbs (40%)	—	—
Protein (30%)	—	—
Fat (30%)	—	—

Live Result Illustration

Visual summary — updates instantly as you enter values above

LIVE

Real-Life Guide to Using the Calorie / BMR Calculator

Daily calorie need and BMR. Use the examples and checks below to turn the number into a practical decision.

When this calculator is useful

Anyone planning a weight-loss or muscle-gain diet starts here to find out how many calories to eat per day, and it is also used to sanity-check a fad diet's calorie target before committing to it.

For most people, the best way to use the Calorie / BMR Calculator is to try the real case first, then change one input at a time. That makes the trade-off visible. For example, with a loan calculator you can change tenure while keeping the same rate; with an investment calculator you can change return assumption while keeping the same monthly contribution; with a health, education or measurement calculator you can check how much one input changes the final category.

The result should answer a practical question: Can I afford this? How much should I save? Is this score enough? Is this measurement within range? What is the safer or cheaper option? If the output does not answer the decision clearly, adjust the inputs until the scenario matches your real situation.

Real-Life Example

Homemaker planning a moderate cut: A 35-year-old woman, 160 cm tall, 65 kg, moderately active with daily walks and household work, wants a realistic calorie target to lose weight gradually.

1Mifflin-St Jeor BMR = (10×65) + (6.25×160) - (5×35) - 161 = 650 + 1000 - 175 - 161 = 1314 kcal. With a moderate activity multiplier of 1.55, maintenance = 1314 × 1.55 ≈ 2037 kcal, so a 500 kcal deficit puts her daily target around 1537 kcal for roughly 0.5 kg of weekly loss.

2Now change one input, such as rate, time, quantity, unit or score, and compare the new result with the first one.

The safe deficit is calculated from total maintenance calories, not from the bare BMR number, which is why eating "just the BMR" is usually too aggressive.

Practical Advice

Use the Calorie / BMR Calculator as a planning tool, not just a number generator. Write down the inputs you used, because the final answer is meaningful only when you remember the assumptions behind it.

If the decision affects money, health, tax, safety, academics or legal compliance, keep a second check ready. That second check may be a bank quote, payslip, official rule, prescription, site measurement, mark sheet or invoice.

Common Mistakes

Confusing BMR (calories burned lying in bed all day) with the actual daily calorie target, then eating only that BMR amount and ending up dangerously under-fed
Selecting "sedentary" activity level while actually doing an hour of gym training five days a week, understating real calorie needs by 400-600 kcal
Cutting 1000+ calories below maintenance overnight expecting faster results, which usually backfires through muscle loss and metabolic slowdown
Ignoring that the Mifflin-St Jeor formula assumes a "typical" body composition, so it can overestimate needs for someone with very high body fat
Not recalculating after losing 5-10 kg, since a lighter body needs fewer calories and the old target becomes too high for continued progress

How to Interpret Results

Your BMR is the calorie floor your body needs at complete rest; the calculator multiplies it by an activity factor to give a maintenance calorie figure, and a healthy deficit for fat loss is typically 300-500 kcal below that maintenance number, not below the BMR itself.

A good interpretation looks at both the main result and the supporting values. If a page shows totals, ratios, categories, schedules or warnings, read those together instead of focusing only on the biggest number.

Calorie / BMR Calculator FAQs

Useful answers for interpreting the output, avoiding mistakes and using the result responsibly.

What is the difference between BMR and the daily calorie number shown?

BMR is the energy your body burns at complete rest just to keep organs functioning; the daily calorie figure multiplies BMR by an activity factor to account for movement, exercise, and daily life. Eating exactly your BMR every day, rather than your activity-adjusted total, is far too low for most people.

Which formula does this calculator use?

It uses the Mifflin-St Jeor equation, currently considered more accurate than the older Harris-Benedict formula for most adults. It factors in weight, height, age, and sex.

Why do two people with the same weight get different calorie numbers?

Age, height, sex, and selected activity level all change the result even at identical body weight, because BMR calculations weigh these factors differently for men and women and across age brackets. Muscle mass, which the formula does not directly measure, also affects real-world calorie burn.

Is this accurate for athletes or bodybuilders?

It tends to underestimate needs for people with high muscle mass since muscle burns more calories than fat at rest, and it may also miss the extra energy cost of intense training blocks. Athletes often need to add several hundred calories on top of the calculator's estimate.

Can pregnant or breastfeeding women use this calculator?

This calculator does not account for pregnancy or lactation, both of which significantly raise calorie needs. Please consult an obstetrician or dietitian for calorie guidance during these periods rather than relying on this estimate.

How aggressive should my calorie deficit be?

A deficit of 300-500 kcal per day below maintenance is generally considered sustainable and produces roughly 0.25-0.5 kg of fat loss per week. Larger deficits increase the risk of muscle loss, fatigue, and nutrient deficiencies.

Why did my weight loss stall even though I am eating the suggested calories?

As you lose weight, your BMR drops because a lighter body needs less energy, so a target that worked at 70 kg can become your new maintenance at 63 kg. Recalculating every 5-8 kg lost helps keep the deficit accurate.

Should I trust this over a dietitian's recommendation?

No, this calculator gives a population-average estimate useful as a starting point, but a dietitian can account for medical conditions, medications, and lab results a formula cannot see. Use this tool to understand the ballpark, then get personalised advice if you have a health condition like thyroid issues or diabetes.

What is BMR and TDEE?

BMR (Basal Metabolic Rate) is the minimum calories your body burns at complete rest — just to keep your heart beating, lungs breathing, and cells functioning. TDEE (Total Daily Energy Expenditure) multiplies BMR by your activity level to give the actual calories you burn throughout the day.

To lose weight sustainably, eat 300�500 kcal below your TDEE. To gain muscle, eat 300�500 kcal above it. TDEE is far more accurate than a generic "2000 calorie" target because it accounts for your unique body composition and lifestyle.

Example Calculation

Scenario: Mr. Arjun Mehta, 28-year-old software developer at Wipro, Pune — weighs 78 kg, 178 cm tall, exercises lightly 3 days/week, wants to lose 8 kg before his wedding

1BMR (male) = 10�78 + 6.25�178 - 5�28 + 5 = 1,757 kcal/day

2TDEE = 1,757 — 1.375 (Lightly Active) = 2,416 kcal/day

3Weight loss target = 2,416 - 500 = 1,916 kcal/day → ~0.5 kg/week loss

✓ Arjun needs ~1,916 kcal/day to lose 8 kg in approx 16 weeks

How to Use the Calorie Calculator

Select your gender — BMR calculation uses different constants for males and females under the Mifflin-St Jeor equation.
Enter your age in years, weight in kilograms, and height in centimetres accurately — these three values are the inputs to the BMR formula.
Select your activity level: Sedentary (desk job, no exercise), Lightly Active (1�3 days/week), Moderately Active (3�5 days), Very Active (6�7 days), or Extra Active (physical job + daily training).
Click Calculate Calories to see your BMR, TDEE, calorie targets for weight loss (TDEE -500 kcal) and weight gain (TDEE +500 kcal), daily protein target, and a macro breakdown.

Benefits

Personalised daily calorie target based on your body stats — not a generic "2,000 kcal" standard
Weight loss and gain targets built in — clear kcal targets for every fitness goal
Protein target in grams — critical for muscle preservation during weight loss
40/30/30 macro breakdown (carbs/protein/fat) provides a ready-made diet starting point
Update as your weight changes to recalibrate targets throughout your fitness journey

Key Terms

BMR (Basal Metabolic Rate): The calories your body burns at complete rest — breathing, circulation, temperature regulation, and cell repair. The foundation of all calorie calculations.
TDEE (Total Daily Energy Expenditure): BMR multiplied by an activity factor — the total calories you actually burn through a typical day including exercise and movement.
Caloric Deficit: Consuming fewer calories than TDEE. A 500 kcal deficit creates ~0.5 kg/week weight loss — the safest, most sustainable rate.
Caloric Surplus: Consuming more calories than TDEE. A 300�500 kcal surplus supports muscle gain (lean bulk) while minimising excess fat accumulation.
Macronutrients: The three food categories that provide energy: Carbohydrates (4 kcal/g), Protein (4 kcal/g), and Fat (9 kcal/g). The ratio between them shapes body composition outcomes.

Frequently Asked Questions

How accurate is the Mifflin-St Jeor formula for calculating BMR?

The Mifflin-St Jeor equation (1990) is currently the most accurate BMR formula for most people, validated in multiple studies as accurate within 10% for ~82% of the general population. It outperforms older formulas like Harris-Benedict (1919). However, it still assumes average body composition — it may underestimate BMR for very muscular individuals and overestimate it for those with high body fat percentages. For high-precision needs, indirect calorimetry in a lab is the gold standard.

How do I choose the right activity level?

Most people underestimate their activity level — choose based on what you actually do consistently, not your ideal week. Sedentary: desk job, walk less than 5,000 steps/day. Lightly Active: 5,000�7,500 steps/day, occasional gym visit. Moderately Active: deliberate exercise 3�5 days/week, 7,500�10,000 steps/day. Very Active: intense training 6�7 days/week or a physically demanding job. Extra Active: athletes in twice-daily training or very labour-intensive jobs.

Can I lose weight faster by creating a 1,000 kcal deficit?

A 1,000 kcal daily deficit creates approximately 1 kg/week weight loss in theory, but the body adapts: metabolic rate slows (adaptive thermogenesis), muscle is catabolised for energy, hunger hormones surge, and adherence becomes very difficult. Most dietitians recommend a 500�750 kcal deficit (0.5�0.75 kg/week) as the sustainable sweet spot — fast enough to see results, slow enough to preserve muscle and maintain for months. Large deficits (1,000+ kcal) are typically unsustainable and rebound-prone.

How much protein do I need per day?

Research consistently shows that 1.6�2.2 g of protein per kg of body weight per day is optimal for muscle building and preservation during fat loss. This calculator shows 0.8 g per lb (�1.76 g/kg) as a good middle estimate. For a 70 kg person: 70 — 1.76 — 123 g protein/day. Distribute protein across 3�5 meals (25�40 g per meal) for maximum muscle protein synthesis. Good Indian protein sources include eggs, paneer, dal, chicken, and Greek yoghurt (Greek dahi).

Why does my TDEE decrease as I lose weight?

TDEE drops as weight decreases because a lighter body burns fewer calories at rest (lower BMR) and during activity (less mass to move). Additionally, the body undergoes metabolic adaptation — deliberately reducing energy expenditure in response to prolonged caloric restriction. This is why weight loss often plateaus: a calorie intake that was a deficit at 90 kg may become maintenance at 75 kg. Recalculate your TDEE every 5 kg of weight change and adjust calorie targets accordingly.

Do I need to count calories to lose weight?

Not necessarily — but awareness of caloric intake significantly improves results. Studies show people who track food intake lose 2� more weight than those who don't, primarily because it reveals hidden calorie sources (cooking oils, beverages, sauces, snacks). For most beginners, a simpler approach — eating mostly whole foods, reducing ultra-processed foods, controlling portions — achieves a natural deficit without meticulous tracking. Calorie counting is most useful for the last 5�10 kg or for body composition goals requiring precision.

Calorie Calculator (TDEE/BMR)