How Many Calories Should I Eat Per Day? Formula, Charts & Examples (2026 Guide)

Updated: June 2026 • 12-minute read

One of the most common nutrition questions is "How many calories should I eat per day?" Unfortunately, there isn't a single number that works for everyone. Your ideal daily calorie intake depends on your age, sex, height, weight, activity level, and whether your goal is to lose fat, maintain weight, or build muscle.

The good news is that you don't need to guess. By calculating your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE), you can estimate exactly how many calories your body burns each day and choose an appropriate calorie target.

Quick Answer

Most adult women require approximately 1,800–2,400 calories per day, while most adult men need around 2,200–3,000 calories per day. Your exact requirement depends primarily on your body size and activity level.

How Many Calories Should You Eat?

Daily calorie intake depends on your goal.

Goal	Calories to Eat
Maintain Weight	Your TDEE
Lose Weight	TDEE − 250 to 750 calories
Gain Muscle	TDEE + 250 to 500 calories

Rather than using generic calorie recommendations, it's far more accurate to calculate your personal maintenance calories using your own body measurements.

Calculate Your Daily Calories

Our Calorie Calculator estimates your BMR, TDEE, calorie deficit, calorie surplus, daily macros, and weight-loss timeline in seconds.

Step 1: Calculate Your Basal Metabolic Rate (BMR)

Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest. Even if you stayed in bed all day, your body would still need energy to support breathing, circulation, organ function, hormone production, and cell repair.

For most adults, BMR accounts for approximately 60% to 75% of total daily calorie expenditure.

The Mifflin-St Jeor Equation

The Mifflin-St Jeor equation is widely regarded as one of the most accurate formulas for estimating BMR in healthy adults.

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

Worked Example

Let's calculate the BMR for a 30-year-old man who weighs 175 lb (79.4 kg) and is 5 ft 10 in (178 cm) tall.

BMR = (10 × 79.4) + (6.25 × 178) − (5 × 30) + 5

= 794 + 1,112.5 − 150 + 5

BMR ≈ 1,762 calories per day

This means his body burns approximately 1,762 calories every day at complete rest, before accounting for walking, exercise, work, or other daily activities.

Step 2: Calculate Your Total Daily Energy Expenditure (TDEE)

Your BMR only measures calories burned while resting. To estimate your total calorie needs, multiply your BMR by an activity factor. This gives your Total Daily Energy Expenditure (TDEE), which represents the total calories your body burns in a typical day.

TDEE = BMR × Activity Multiplier

Activity Multipliers

Activity Level	Multiplier	Description
Sedentary	1.20	Little or no exercise
Lightly Active	1.375	Exercise 1–3 days per week
Moderately Active	1.55	Exercise 3–5 days per week
Very Active	1.725	Hard exercise most days
Extra Active	1.90	Very demanding physical job or twice-daily training

For our example, multiplying a BMR of 1,762 calories by the moderately active multiplier (1.55) gives:

TDEE = 2,731 calories per day

This is the approximate number of calories needed each day to maintain current body weight.

Calories for Weight Loss

To lose body fat, you must consume fewer calories than your body burns. This is known as a calorie deficit. When your body doesn't receive enough energy from food, it begins using stored body fat to make up the difference.

The size of your calorie deficit directly affects how quickly you lose weight. However, bigger isn't always better. Extremely low-calorie diets can increase hunger, reduce exercise performance, and lead to muscle loss.

Quick Rule

A daily calorie deficit of 250–500 calories is considered sustainable for most healthy adults and typically results in gradual, maintainable fat loss.

Recommended Daily Calorie Deficits

Daily Deficit	Estimated Weekly Fat Loss	Best For
250 Calories	≈ 0.5 lb (0.2 kg)	Slow, sustainable fat loss
500 Calories	≈ 1 lb (0.45 kg)	Recommended for most adults
750 Calories	≈ 1.5 lb (0.7 kg)	Short-term weight loss under guidance
1,000 Calories	≈ 2 lb (0.9 kg)	Medical supervision recommended

Example: Calories Needed to Lose Weight

Suppose your Total Daily Energy Expenditure (TDEE) is 2,700 calories.

Goal	Daily Calories	Expected Result
Maintain Weight	2,700	No weight change
Mild Weight Loss	2,450	≈0.5 lb/week
Recommended Fat Loss	2,200	≈1 lb/week
Aggressive Fat Loss	1,950	≈1.5 lb/week

Consistency matters much more than perfection. A moderate calorie deficit that you can maintain for months almost always produces better long-term results than an aggressive diet that lasts only a few weeks.

Calories for Muscle Gain

Building muscle requires extra energy. Instead of eating below maintenance calories, you'll generally need a calorie surplus while following a structured resistance-training program.

A moderate surplus provides enough energy for muscle growth while minimizing unwanted fat gain.

Recommended Calorie Surplus

Daily Surplus	Typical Goal
+200 Calories	Lean muscle gain
+300 Calories	Balanced lean bulk
+500 Calories	Maximum muscle gain (more fat gain possible)

Most evidence suggests that a moderate surplus of around 250–300 calories per day provides the best balance between muscle growth and minimizing body fat accumulation.

Calories Needed to Maintain Weight

Maintenance calories are simply your TDEE. If you consistently consume approximately the same number of calories that your body burns, your body weight should remain relatively stable over time.

Small day-to-day fluctuations are completely normal because body weight is influenced by hydration, glycogen storage, digestion, sodium intake, and hormonal changes.

Goal	Calories
Lose Weight	TDEE − 250 to 750
Maintain Weight	TDEE
Gain Muscle	TDEE + 250 to 500

Average Daily Calorie Needs by Age and Sex

Although personalized calculations are always more accurate, the following table shows general calorie recommendations for healthy adults with moderate activity levels.

Age	Women	Men
19–30 years	2,000–2,400	2,400–3,000
31–50 years	1,800–2,200	2,200–2,800
51+ years	1,600–2,200	2,000–2,800

These values are intended only as broad guidelines. Your own calorie needs may be significantly higher or lower depending on body composition, occupation, genetics, and exercise habits.

Factors That Affect Your Daily Calorie Needs

Two people of the same height can have very different calorie requirements because numerous factors influence daily energy expenditure.

Age: Metabolism generally slows with age as lean muscle mass decreases.
Sex: Men typically burn more calories because they usually have more muscle mass.
Height: Taller people generally require more calories.
Weight: Larger bodies require more energy to function.
Muscle Mass: Muscle tissue burns more calories than fat tissue, even while resting.
Physical Activity: Exercise, work, walking, and daily movement all increase calorie expenditure.
Genetics: Individual metabolism naturally varies from person to person.
Health Conditions: Certain medical conditions and medications can increase or decrease calorie requirements.

Why Your Calorie Needs Change Over Time

Your calorie requirements are not fixed. As your weight changes, your BMR and TDEE also change.

For example, someone who loses 40 pounds will usually burn fewer calories than they did before losing weight because a smaller body requires less energy to maintain.

Likewise, increasing muscle mass through strength training can gradually increase resting calorie expenditure.

SEO Tip

Recalculate your calorie needs every 10–15 pounds (5–7 kg) of weight change to keep your nutrition plan accurate.

Should You Eat Back Exercise Calories?

Many fitness trackers estimate calories burned during exercise. While these estimates can be useful, they are often inaccurate and may overestimate calorie expenditure.

If your goal is weight loss, many nutrition professionals recommend eating back only a portion of your estimated exercise calories unless you perform prolonged endurance training.

Our Calorie Calculator includes a dedicated Calories Burned mode that estimates energy expenditure for dozens of common physical activities.

Common Mistakes When Calculating Daily Calories

Many people underestimate or overestimate their calorie needs because they make one or more of the following mistakes. Avoiding these common errors can significantly improve your results.

Mistake	Why It Matters	Better Approach
Choosing an activity level that's too high	Overestimates TDEE and calorie needs	Be conservative and increase only if your weight remains stable.
Ignoring liquid calories	Drinks can contribute hundreds of calories daily.	Track coffee, soda, alcohol, juices, and sports drinks.
Using the same calorie target forever	Your metabolism changes as your weight changes.	Recalculate every 5–7 kg (10–15 lb) lost or gained.
Eating too few calories	May increase hunger, reduce energy, and promote muscle loss.	Aim for a moderate calorie deficit instead of crash dieting.
Ignoring protein intake	Protein helps preserve lean muscle during weight loss.	Meet your daily protein target alongside your calorie goal.

Frequently Asked Questions

How many calories should I eat per day?

Your ideal calorie intake depends on your age, sex, height, weight, activity level, and fitness goal. The most accurate approach is to calculate your Total Daily Energy Expenditure (TDEE) and then adjust your calories based on whether you want to lose, maintain, or gain weight.

How many calories should I eat to lose weight?

Most adults lose weight safely by eating approximately 250–500 calories below their maintenance calories each day. A 500-calorie daily deficit typically produces around one pound (0.45 kg) of weight loss per week.

How many calories should I eat to gain muscle?

A moderate calorie surplus of 250–500 calories above maintenance is generally recommended for muscle growth. Combining this with progressive resistance training and adequate protein intake helps maximize lean muscle gain.

What is TDEE?

Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns each day. It includes your Basal Metabolic Rate (BMR), daily activities, exercise, and digestion.

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body requires to maintain basic life functions such as breathing, circulation, and cell repair while completely at rest.

How accurate are calorie calculators?

Calorie calculators provide estimates based on validated scientific equations such as the Mifflin-St Jeor formula. Individual calorie needs can vary due to genetics, body composition, hormones, and lifestyle, so treat the result as a starting point and adjust based on your progress.

Can I lose weight without counting calories?

Yes. Some people lose weight by improving food quality, controlling portion sizes, and increasing physical activity. However, understanding calorie intake generally makes weight management more predictable.

Should I eat back calories burned during exercise?

Fitness trackers often overestimate calories burned. If your goal is fat loss, many experts recommend replacing only part of your exercise calories unless you participate in prolonged endurance training.

How often should I recalculate my calorie needs?

Recalculate your calorie target whenever your body weight changes by approximately 10–15 pounds (5–7 kg), your activity level changes significantly, or your fitness goal changes.

Calculator	Purpose
Calorie Calculator	Calculate BMR, TDEE, calorie deficit, surplus, macros, and weight-loss timeline.
BMR Calculator	Estimate your resting metabolic rate using multiple scientific formulas.
TDEE Calculator	Estimate the calories you burn each day based on activity level.
BMI Calculator	Check whether your weight falls within a healthy BMI range.
Protein Calculator	Calculate your daily protein intake for muscle gain or fat loss.
Water Intake Calculator	Estimate your daily hydration needs.
Body Fat Calculator	Estimate your body fat percentage using body measurements.

Calculate Your Daily Calorie Needs

Knowing your daily calorie target is one of the most effective ways to manage your weight, improve athletic performance, and support long-term health. Instead of relying on generalized recommendations, calculate your personal calorie needs using your own body measurements and activity level.

Free Calorie Calculator

Our comprehensive Calorie Calculator instantly estimates:

Basal Metabolic Rate (BMR)
Total Daily Energy Expenditure (TDEE)
Calories for weight loss
Calories for weight maintenance
Calories for muscle gain
Daily protein, carbohydrate, and fat targets
Goal weight timeline
Calories burned from exercise

Calculate My Daily Calories →

Key Takeaways

Your calorie needs depend on your age, sex, height, weight, activity level, and goals.
BMR measures calories burned at complete rest, while TDEE includes daily activity and exercise.
Eat around your TDEE to maintain weight.
Create a moderate calorie deficit of 250–500 calories per day for sustainable fat loss.
Add approximately 250–500 calories above maintenance for muscle gain.
Recalculate your calorie needs whenever your weight or activity level changes significantly.
Protein intake, strength training, sleep, and consistency are just as important as calorie intake for long-term success.
Use a personalized calculator instead of relying on generic calorie recommendations.

Whether your goal is losing weight, maintaining your current weight, or building muscle, understanding your daily calorie requirements gives you a solid foundation for making informed nutrition decisions. Start by calculating your maintenance calories, then adjust your intake gradually based on your progress and long-term goals.