Calorie Calculator

FITNESS & NUTRITION · FREE TOOL

Calorie Calculator: Find out exactly how many calories you need each day. Enter your age, gender, height, weight, and activity level and get your BMR, TDEE, calorie targets for every goal, and recommended daily macros, all in one place. No sign-up. No cost. Ever.

  • Uses the Mifflin-St Jeor equation. the gold standard formula
  • Covers weight loss, maintenance & muscle gain
  • Shows BMR, TDEE & all goal calorie targets at once
  • Includes recommended daily macros (protein, carbs, fat)
Calculate My Calories
Home → Fitness & Nutrition → Calorie Calculator
🔥

Calorie Calculator

Calculate your daily calorie needs (TDEE) by age, gender, weight, height, and activity level

yrs
ft in
lbs

Results use the Mifflin-St Jeor equation — the gold standard for BMR estimation. Calorie needs are estimates and vary by individual. Consult a registered dietitian or healthcare provider for personalized nutrition guidance.

How to Use This Calorie Calculator

  1. Choose your unit system: US/Imperial (feet, inches, pounds) or Metric (cm, kg).
  2. Enter your age: metabolism slows with age, so this directly affects your results.
    Select your gender  biological sex significantly influences BMR due to differences in muscle mass and hormones.
  3. Enter your height and weight: use your most recent measurements for accuracy.
  4. Choose your activity level: be honest here; most people overestimate their activity. When in doubt, go one level lower.
  5. Select your goal: weight loss, maintenance, or muscle gain. The calculator shows all six goal targets simultaneously so you can compare.
  6. Click “Calculate My Calories”: your BMR, TDEE, target calories, macros, and a personalized note all appear instantly.

Tip: After getting your result, treat it as a starting target for 2–3 weeks and adjust based on real-world results. Your actual metabolism may vary by ±10–15% from the estimate.

Average Daily Calorie Needs by Activity

Activity LevelWomenMen
Sedentary~1,600–1,800 cal~2,000–2,200 cal
Lightly Active~1,800–2,000 cal~2,200–2,500 cal
Moderately Active~2,000–2,200 cal~2,500–2,800 cal
Very Active~2,200–2,600 cal~2,800–3,200 cal
Extra Active~2,400–3,000 cal~3,000–4,000 cal

General estimates. Your number depends on your exact age, height, and weight.

Calories Calculator, what Is TDEE and BMR and Why Do They Matter?

To manage your weight or improve your body composition, there are two numbers you need to know: your BMR and your TDEE.

Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest  just to keep you alive. It represents the energy required to breathe, pump blood, regulate body temperature, produce hormones, and maintain every cell in your body. For most people, BMR accounts for approximately 60–70% of total daily calorie expenditure. It is the floor the minimum your body needs even if you lie still all day.

Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a typical day, accounting for all physical activity  from walking to the kitchen to your most intense training session. TDEE is your BMR multiplied by an activity multiplier that reflects how physically active your lifestyle truly is.

Why this matters: Your TDEE is your maintenance calorie level. Eating below it creates a calorie deficit, which leads to fat loss. Eating above it creates a surplus, which supports muscle growth. Eating at TDEE maintains your current weight. Without knowing your TDEE, there is no reliable way to set calorie targets you’re guessing.

The formula we use: Our calculator uses the Mifflin-St Jeor equation, published in 1990 and validated across thousands of subjects as the most accurate formula for estimating BMR in the general adult population. It is the preferred formula of the Academy of Nutrition and Dietetics and most registered dietitians.

Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

Calories Count Stats

Avg Daily Calories for Women (USDA)
0 K
Avg Daily Calories for Men (USDA)
0 K
Calories in One Pound of Body Fat
0 K
Daily Deficit Needed to Lose ~1 lb/Week
0 C

* Your number may vary.

Daily Calorie Needs

Basal Metabolic Rate (BMR)

Your BMR is the largest single component of your total daily energy expenditure  typically 60–70% of everything you burn in a day. It is determined primarily by your body size (height and weight), body composition (muscle vs. fat), age, and sex. Muscle tissue burns significantly more calories at rest than fat tissue, which is why two people of the same weight can have very different BMRs if one is more muscular. As you age, BMR naturally declines  roughly 1–2% per decade after age 30  which is one reason weight management tends to become more challenging over time.

Activity Multiplier (TDEE Calculation)
Once your BMR is established, it is multiplied by a Standard Activity Factor (SAF) to estimate your TDEE. These multipliers range from 1.2 for completely sedentary individuals to 1.9 for those with extremely active lifestyles. Activity level is the most common source of error in TDEE estimation  most people overestimate their activity, which leads to overestimating calorie needs. If you have a desk job and exercise 3 days per week, you are likely “lightly active” (1.375), not “moderately active” (1.55). Choosing one level lower than you think is often more accurate.

A calorie deficit means consuming fewer calories than your TDEE. The commonly cited “3,500 calories = 1 pound of fat” rule is a useful approximation: a 500-calorie daily deficit leads to approximately 1 pound of fat loss per week. In practice, the relationship is not perfectly linear, the body adapts to caloric restriction over time through a process called metabolic adaptation, which means weight loss can slow even at the same deficit. A moderate deficit (300–500 cal/day) is generally recommended for sustainable fat loss that minimizes muscle loss, hormonal disruption, and rebound weight gain.

Building muscle requires a calorie surplus consuming more than your TDEE to provide the energy and raw materials for muscle protein synthesis. However, a surplus does not mean unlimited eating. Excessive surpluses lead primarily to fat gain, not muscle. Research suggests that a surplus of 200–500 calories per day, combined with consistent progressive resistance training and adequate protein intake (0.7–1g per lb of body weight), produces optimal muscle gain with minimal fat accumulation. This is the “lean bulk” approach favored by most sports nutritionists.

Protein is the most metabolically important macronutrient for body composition. It builds and repairs muscle tissue, has the highest thermic effect of food (you burn more calories digesting it), and provides the strongest satiety signal helping you feel full on fewer total calories. For weight loss, research consistently supports higher protein intakes of 1.6–2.2g per kg of body weight per day to preserve lean mass during a deficit. For muscle gain, protein intake of 1.6–2.2g/kg is similarly optimal. Our calculator recommends protein as approximately 30% of total calories.

Our calculator uses a balanced 30/40/30 split (protein/carbohydrates/fat) as a default macro recommendation. This is a practical, widely recommended starting point for most healthy adults. However, optimal ratios vary based on your goals, training type, and personal preferences. Endurance athletes typically benefit from higher carbohydrate intakes. Strength-focused individuals may benefit from higher protein. Those following ketogenic or low-carb protocols dramatically reduce carbohydrates and increase fat. The most important variable is total calorie intake  macros optimize the results you get within that ceiling.

Metabolic adaptation (sometimes called “adaptive thermogenesis”) is the body’s response to sustained caloric restriction. Over time typically after several weeks at a consistent deficit the body reduces energy expenditure as a survival mechanism, making weight loss progressively harder. This is why plateaus are common in long-term diets. Strategies to manage adaptation include diet breaks (returning to maintenance calories for 1–2 weeks), refeeds (periodic higher-carb days), and adjusting calorie targets as body weight changes. Using our calculator periodically to update your TDEE as your weight changes is an effective way to keep targets accurate.

Calorie Targets by Goal: Which Is Right for You?

GoalDaily CaloriesWeekly ResultBest For
Extreme Weight LossTDEE − 1,000~2 lbs/week lostShort-term, medical supervision recommended
Weight LossTDEE − 500~1 lb/week lostMost people — best balance of speed & sustainability
Mild Weight LossTDEE − 250~0.5 lbs/week lostNear goal weight, beginners, sustainable long-term
MaintenanceTDEE0 changeMaintaining current weight, recomp phase
Mild Muscle GainTDEE + 250~0.25–0.5 lbs/week gainedLean bulk, beginners, body recomposition
Muscle Gain / BulkTDEE + 500~0.5–1 lb/week gainedExperienced lifters in active training program

The “right” calorie target

depends entirely on your goal, your starting point, and how sustainable the approach is for your lifestyle. A 500-calorie deficit is the most studied and recommended approach for weight loss  but a 250-calorie deficit you can maintain for six months will always outperform a 1,000-calorie deficit that leads to burnout after two weeks. Use the calculator to find your number, then commit to it consistently for at least 3–4 weeks before evaluating results.

Calorie Calculator Frequently Asked Questions

How many calories should I eat a day?

Your daily calorie needs depend on your age, gender, height, weight, and activity level. The USDA estimates that most adult women need 1,600–2,400 calories per day and most adult men need 2,000–3,000 calories per day, depending on activity level. However, these are averages  your personal number could be higher or lower. Use our free calorie calculator above to get a precise estimate based on your individual stats using the Mifflin-St Jeor equation, the most accurate BMR formula for adults.

To lose approximately 1 pound per week, you need to eat 500 calories fewer than your Total Daily Energy Expenditure (TDEE) each day. This is based on the widely accepted principle that one pound of body fat contains approximately 3,500 calories. For a slower, more sustainable approach, a 250-calorie daily deficit produces about 0.5 pounds of loss per week. Most nutrition professionals recommend keeping your intake above 1,200 calories per day for women and 1,500 for men to avoid nutrient deficiencies and metabolic adaptation.

A calorie deficit occurs when you consume fewer calories than your body burns (your TDEE). This energy shortfall forces the body to tap into stored fat for fuel, resulting in fat loss over time. A deficit of 500 calories per day leads to approximately 1 pound of fat loss per week. A deficit of 1,000 calories per day would theoretically produce 2 pounds per week, but this level is aggressive and requires medical oversight for most people. Moderate, consistent deficits produce better long-term results than extreme restriction.
TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns in a day, including all physical activity. It is calculated by multiplying your Basal Metabolic Rate (BMR) by an activity multiplier. For example, a moderately active person multiplies their BMR by 1.55. Our calculator performs this calculation automatically using the Mifflin-St Jeor equation for BMR and standard activity multipliers established in exercise physiology research.
BMR stands for Basal Metabolic Rate the number of calories your body burns at complete rest, just to sustain basic biological functions like breathing, circulation, and cell production. It accounts for approximately 60–70% of your total daily calorie burn. BMR is calculated using your height, weight, age, and sex. Our calculator uses the Mifflin-St Jeor equation (1990), which is the most accurate general-purpose formula for estimating BMR in healthy adults.
Losing 2 pounds per week requires a daily calorie deficit of approximately 1,000 calories below your TDEE. For example, if your TDEE is 2,500 calories, you would need to eat approximately 1,500 calories per day. This is an aggressive deficit, and most nutrition professionals recommend this rate only for people who are significantly overweight and are doing so under medical supervision. For most people, targeting 1 pound per week (500-calorie deficit) is more sustainable and produces better long-term results.
To build muscle, you need to be in a slight calorie surplus eating more than your TDEE to provide energy and nutrients for muscle protein synthesis. A surplus of 250–500 calories per day is generally recommended for lean muscle gain. Combined with consistent progressive resistance training and adequate protein intake (0.7–1g per lb of body weight per day), this “lean bulk” approach builds muscle while minimizing unwanted fat gain. Larger surpluses do not produce proportionally more muscle they mainly produce more fat.
Your calorie deficit is the difference between your TDEE (maintenance calories) and what you actually eat. Step 1: Calculate your TDEE using our calculator. Step 2: Subtract your target calorie intake from your TDEE. For example, if your TDEE is 2,200 and you eat 1,700 calories per day, your deficit is 500 calories targeting approximately 1 lb of fat loss per week. Track your calories using an app like MyFitnessPal or Cronometer for the most accurate results.
The average adult woman needs approximately 1,600–2,400 calories per day depending on age and activity level. However, the most accurate way to determine your specific needs is to calculate your TDEE using the Mifflin-St Jeor equation with your personal stats. Women who are very active, pregnant, or breastfeeding have substantially higher calorie needs. Women trying to lose weight should target approximately 500 calories below their TDEE while keeping total intake above 1,200 calories per day.
The average adult man needs approximately 2,000–3,000 calories per day depending on age, size, and activity level. Men with higher muscle mass, larger frames, or physically demanding jobs or training routines may need significantly more. Use the calculator above with your specific stats to get an accurate personal estimate. Men trying to lose weight should target approximately 500 calories below their TDEE, keeping total intake above 1,500 calories per day.
For most adults, 1,200 calories per day is the minimum generally considered safe for women, and 1,500 for men. Eating below these thresholds for an extended period risks nutrient deficiencies, muscle loss, fatigue, hormonal disruption, and metabolic adaptation. For many women particularly those who are taller, heavier, or more active even 1,200 calories represents an extreme deficit. The American College of Sports Medicine recommends these as absolute minimums only, not targets. A moderate 500-calorie deficit from TDEE is almost always more sustainable and healthier.
All calorie calculators including ours produce estimates, not exact measurements. The Mifflin-St Jeor equation has been validated to predict BMR within approximately 10% for most healthy adults in studies comparing it to direct metabolic testing. In practice, this means your actual TDEE may be 100–200 calories higher or lower than the estimate. This is why we recommend using the calculator result as a starting point, tracking your food intake and weight trend for 2–3 weeks, and adjusting your target up or down by 100–200 calories based on your real-world results.

Macronutrients:  protein, carbohydrates, and fat are the three main categories of nutrients that provide calories. Each gram of protein provides 4 calories, each gram of carbohydrate provides 4 calories, and each gram of fat provides 9 calories. Total calorie intake determines whether you gain, lose, or maintain weight. Macronutrient ratios determine your body composition outcomes  the proportion of that weight change that is fat vs. muscle. Higher protein intakes preserve muscle during a cut and support growth during a bulk. Our calculator recommends a 30/40/30 protein/carb/fat split as a practical starting point for most people.

The Mifflin-St Jeor equation is the most widely recommended formula for calculating Basal Metabolic Rate (BMR) in healthy adults. Published in 1990 by M.D. Mifflin and S.T. St Jeor, it was developed from data on nearly 500 subjects using indirect calorimetry and has since been validated in numerous independent studies. It is preferred over the older Harris-Benedict equation (1919) because it is more accurate for modern populations and accounts better for variations in age and gender. It is the formula of choice for the Academy of Nutrition and Dietetics and most registered dietitians.
In everyday nutrition and food labeling, the terms “calorie” and “kilocalorie” (kcal) are used interchangeably. Technically, one dietary calorie equals 1,000 scientific calories (one kilocalorie) enough energy to raise one kilogram of water by one degree Celsius. When a nutrition label says a food has “200 calories,” it means 200 kilocalories. All values in our calculator are in kilocalories (kcal), which is the standard unit for food energy measurement in the United States and most countries worldwide.

Quick Answers: Calories at a Glance

How many calories do I need per day?

Most adult women need 1,600–2,400 calories/day and most men need 2,000–3,000 calories/day, depending on age, size, and activity level. The most accurate way to find your number is to calculate your TDEE using the Mifflin-St Jeor equation: BMR × activity multiplier (1.2 for sedentary to 1.9 for extra active)

What is a good calorie deficit for weight loss?

A deficit of 300–500 calories per day is recommended by most nutrition professionals as the optimal range producing consistent fat loss while preserving muscle mass and avoiding metabolic adaptation.

How many calories to lose 1 pound a week?

A daily deficit of 500 calories below your TDEE equals approximately 1 pound of fat loss per week (500 × 7 days = 3,500 calories ≈ 1 lb of fat).

How many calories does the average person burn per day?

The average adult burns approximately 1,800–2,500 calories per day depending on body size, sex, age, and activity level. This is your TDEE use our calculator above for a precise personal estimate.

How many calories to lose 2 pounds a week?

A daily deficit of 1,000 calories below your TDEE. For example, if your TDEE is 2,500 calories, eat 1,500 calories per day. This level is aggressive and best approached under medical guidance.

What happens if I eat too few calories?

Eating too few calories can slow your metabolism, increase muscle loss, and lead to fatigue, nutrient deficiencies, and hormonal imbalances. While a calorie deficit is necessary for fat loss, going too low can backfire by reducing your energy expenditure and making weight loss harder over time. Most people should avoid dropping below 1,200 calories per day for women and 1,500 for men unless supervised by a healthcare professional.

TIPS FOR HITTING YOUR CALORIE GOALS

7 Practical Tips for Hitting Your Daily Calorie Target

  1. Track your food for at least 2–4 weeks.
    Most people dramatically underestimate how many calories they eat. Studies show that self reported food intake is typically 20–40% lower than actual intake. Using a food tracking app like MyFitnessPal, Cronometer, or Lose It for even a short period creates a level of awareness that improves decision making long after you stop tracking.
  2. Prioritize protein at every meal.
    Protein is the most satiating macronutrient it keeps you full longer, reduces overall calorie intake, and preserves muscle mass during a deficit. Aim for a palm-sized portion of lean protein (chicken, fish, eggs, Greek yogurt, legumes) at every meal.
  3. Eat plenty of volume dense, low calorie foods.
    Vegetables, broth based soups, and large salads allow you to eat a high volume of food for relatively few calories, making it much easier to stay within your target without feeling deprived. A 300-calorie salad and a 300-calorie handful of chips are calorically equivalent but vastly different in their effect on hunger.
  4. Be careful with liquid calories.
    Sodas, fruit juices, specialty coffees, alcohol, and smoothies can silently add hundreds of calories per day without making you feel full. Switching to water, black coffee, or sparkling water is one of the highest leverage single changes you can make.
  5. Plan and prep meals in advance.
    Meal prepping reduces decision fatigue, makes it easier to control portions, and dramatically reduces the likelihood of defaulting to high calorie convenience food when you’re hungry and tired. Even prepping two or three meals ahead creates a meaningful improvement in adherence.
  6. Update your TDEE as your weight changes. As you lose or gain weight, your BMR changes you need fewer calories at a lower body weight. Recalculate your TDEE every 10–15 pounds of weight change, or every 4–6 weeks, to keep your calorie target accurate and avoid plateaus.
  7. Focus on the weekly average, not individual days.
    Calorie targets are best evaluated over weeks, not days. If you eat 300 calories over your target on Wednesday but 300 under on Thursday, the net effect is zero. A flexible approach that aims for your target on average rather than perfectly every single day is more sustainable and produces the same long-term results with far less stress.

New Calculators Just Added: Free Online Tools for Everyday Use

The Science of Calories: A Brief History

The concept of a calorie as a unit of food energy dates to the 1800s. Nicolas Clément, a French physicist, first used the term “calorie” in lectures in the 1820s to describe a unit of heat. Over the following decades, chemists and physiologists developed methods to measure the energy content of food by burning it in a device called a bomb calorimeter and measuring the heat produced.

The first serious scientific work on human calorie requirements came from Wilbur Atwater, an American chemist who, in the 1890s, built a human respiration calorimeter at Wesleyan University essentially a room sized device that measured all the energy going into and coming out of a human body. Atwater’s research established the caloric values of the three macronutrients still used today: 4 calories per gram of protein and carbohydrate, 9 calories per gram of fat.

For most of the 20th century, calorie counting was primarily a clinical and research tool. The modern era of public calorie awareness began in 1990 when the Nutrition Labeling and Education Act mandated calorie information on food packaging in the United States making calorie data visible on every product in the grocery store.

The formulas used in today’s calorie calculators have their own history. The Harris-Benedict equation, developed in 1919, was the dominant BMR formula for nearly 70 years. In 1990, Mifflin and St Jeor published a landmark study comparing multiple equations against direct metabolic measurement and found their new formula to be significantly more accurate. The Mifflin-St Jeor equation quickly became the standard used by registered dietitians and remains the most validated formula for healthy adults today.

The rise of digital food tracking apps in the 2010s democratized calorie awareness in ways that were unimaginable to Atwater’s era. Today, our calorie calculator provides the same clinical-quality formula used by nutrition professionals in seconds, for free.

Free Calculators App 100% Free.
No Sign-Up. No Hidden Costs.

Every calculator on this site is free forever. We never charge subscription fees or sell your data. Calorie and TDEE results are estimates based on the Mifflin-St Jeor equation, always consult a registered dietitian or healthcare provider for personalized nutrition guidance.

Subscribe
Subscribe