Use this free Calorie Calculator to estimate how many calories you may need each day for weight loss, weight maintenance or weight gain. Your result is based on your age, sex, height, weight and activity level.
Calculate How Many Calories You Need
Estimate your daily calorie needs and see starting targets for weight loss, maintenance and weight gain.
How Many Calories Should I Eat Per Day?
The number of calories you need each day depends on your body size, age, sex, activity level and goal.
There is no single calorie target that works for everyone.
Someone who is taller, heavier and physically active will usually require more energy than someone with a smaller body size and a sedentary lifestyle.
Our Calorie Calculator estimates your daily calorie needs and provides starting targets for:
- mild weight loss
- moderate weight loss
- weight maintenance
- lean weight gain
Use the calculated result as a starting point and adjust it according to your real progress.
How Does the Calorie Calculator Work?
The calculator uses two main steps.
Step 1: Estimate Your BMR
BMR stands for Basal Metabolic Rate.
It estimates how many calories your body requires at rest to support essential functions.
The calculator uses the Mifflin–St Jeor equation based on:
- age
- sex
- height
- body weight
Step 2: Estimate Your Daily Calorie Expenditure
Your BMR is then multiplied by your selected activity level.
This creates an estimate of your Total Daily Energy Expenditure, commonly called TDEE.
The basic relationship is:
TDEE = BMR × Activity Multiplier
Your estimated TDEE is used as your starting maintenance calorie level.
Calories for Weight Maintenance
If you want to maintain approximately the same body weight, your estimated TDEE is a useful starting calorie target.
For example, if your calculated maintenance level is:
2,400 calories per day
then eating around 2,400 calories on average may keep you relatively close to energy balance.
However, your body does not burn exactly the same amount of energy every day.
Walking, training, work and normal movement can all change daily expenditure.
For this reason, maintenance calories are best treated as an average rather than an exact daily requirement.
Calories for Weight Loss
Weight loss requires an energy deficit over time.
A calorie deficit means your average calorie intake remains below your average energy expenditure.
Our calculator shows two starting options.
Mild Weight Loss
The mild weight-loss target is approximately:
10% below estimated maintenance calories
For someone with a TDEE of 2,500 calories:
2,500 × 0.90 = 2,250 calories per day
This creates a smaller calorie deficit.
Moderate Weight Loss
The moderate target is approximately:
20% below estimated maintenance calories
Using the same 2,500-calorie example:
2,500 × 0.80 = 2,000 calories per day
A larger deficit is not automatically better.
Very aggressive calorie restriction can make a diet harder to maintain and may affect hunger, recovery and training performance.
Calories for Weight Gain
Gaining body weight generally requires consuming more energy than you expend over time.
For a lean weight-gain starting target, our calculator adds approximately:
10% above estimated maintenance calories
For example:
Maintenance calories: 2,500
10% surplus: 250
Starting calorie target: 2,750 calories per day
The ideal calorie surplus varies between individuals.
Your training, appetite, body composition and rate of weight gain can all affect how much food you may need.
What Is a Calorie?
A calorie is a unit of energy.
Food and drinks provide energy that your body can use.
The three main macronutrients provide approximately:
Protein: 4 calories per gram
Carbohydrates: 4 calories per gram
Fat: 9 calories per gram
Your body uses energy for many purposes, including basic body functions, movement, digestion and exercise.
What Is BMR?
BMR stands for Basal Metabolic Rate.
It estimates the amount of energy your body needs at rest.
Even if you spent the entire day resting, your body would still require energy to support processes such as breathing, circulation and normal organ function.
Your BMR is not the same as the total number of calories you burn in a normal day.
Daily activity increases energy expenditure beyond your resting needs.
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure.
It estimates your total calorie expenditure after activity is included.
For example, someone may have:
BMR: 1,650 calories
but after accounting for daily activity:
TDEE: 2,450 calories
This is why TDEE is generally more useful than BMR when planning daily calorie intake.
For a more detailed look at daily energy expenditure, use our TDEE Calculator.
How Activity Level Changes Calorie Needs
Activity level can have a major effect on estimated calorie requirements.
Sedentary
Suitable for people who do little structured exercise and spend much of the day sitting.
Lightly Active
May suit people who perform light exercise around one to three days per week.
Moderately Active
May suit people who exercise around three to five days per week.
Very Active
May suit people who train hard most days of the week.
Extra Active
Generally intended for people with demanding training combined with a physically active lifestyle or occupation.
Do not automatically choose the highest activity level simply because you go to the gym.
The activity setting should represent your overall lifestyle.
Why Your Real Calorie Needs May Be Different
A calorie calculator uses equations and assumptions.
It cannot directly measure your metabolism.
Actual calorie expenditure can vary because of:
- daily movement
- body composition
- training volume
- occupation
- sleep
- changes in body weight
- individual metabolic differences
This is why calculator results should be tested against real-world progress.
How to Find Your Real Maintenance Calories
Start with your calculated maintenance calories.
Then:
- Track your calorie intake reasonably accurately.
- Weigh yourself under similar conditions.
- Look at your average body weight rather than individual weigh-ins.
- Continue for around two to three weeks.
- Compare your weight trend with your goal.
If your average weight stays relatively stable, your calorie intake may be close to maintenance.
If your weight consistently increases, you may be eating above maintenance.
If it consistently decreases, you may be eating below maintenance.
Why Scale Weight Changes Every Day
Daily body weight is affected by much more than body fat.
Short-term changes can come from:
- water
- food in your digestive system
- carbohydrate intake
- sodium intake
- bowel movements
- training
- hydration
This is why a single day’s body weight should not determine whether you increase or decrease calories.
Look at longer-term trends.
Calorie Calculator vs TDEE Calculator
These calculators are closely related but serve slightly different search needs.
A TDEE Calculator focuses on estimating how many calories you burn each day.
A Calorie Calculator focuses on turning that estimate into practical calorie intake targets for weight loss, maintenance and weight gain.
Both tools use similar energy equations because calorie intake goals are built from estimated energy expenditure.
Calorie Calculator vs Macro Calculator
Calories tell you how much total energy to eat.
Macros tell you how those calories can be divided between:
- protein
- carbohydrates
- fat
Once you know your calorie target, use our Macro Calculator to estimate a practical protein, carbohydrate and fat breakdown.
If you mainly want to know how much protein to eat, use our Protein Calculator.
Should I Eat the Same Calories Every Day?
Not necessarily.
Some people prefer eating approximately the same amount each day because it makes tracking easier.
Others eat more on training days and less on rest days.
What matters most for body-weight change is your overall energy balance over time.
A consistent daily target is simply an easy starting approach.
Should I Eat Back Exercise Calories?
Be careful when adding exercise calories back into your diet.
If you selected an activity level that already includes regular exercise, much of that activity is already reflected in the TDEE estimate.
Adding all exercise calories again can accidentally double-count activity.
Fitness watches and machines also provide estimates rather than exact calorie expenditure.
How Often Should I Recalculate Calories?
Recalculate your calorie needs after meaningful changes in:
- body weight
- activity level
- exercise routine
- fitness goal
You do not need to recalculate because your weight changed slightly from one day to the next.
What Should You Calculate Next?
Once you know your estimated calorie needs, you can build the rest of your nutrition plan.
Use our TDEE Calculator to explore daily energy expenditure in more detail.
Use our Macro Calculator to divide your calorie target between protein, carbohydrates and fat.
Use our Protein Calculator if you want a dedicated protein target based on body weight and fitness goal.
Frequently Asked Questions
How many calories should I eat per day?
Your calorie needs depend on age, sex, body size, activity and goal. Use the calculator above to estimate a starting target.
How many calories should I eat to lose weight?
Weight loss requires an energy deficit over time. This calculator provides starting targets approximately 10% and 20% below estimated maintenance calories.
How many calories should I eat to gain weight?
Weight gain generally requires a calorie surplus. Our calculator shows a starting target approximately 10% above estimated maintenance.
How many calories do I need to maintain my weight?
Your estimated TDEE is used as your starting maintenance calorie target.
Is 2,000 calories enough for everyone?
No. Two thousand calories may be above maintenance for one person and far below maintenance for another.
Is eating fewer calories always better for weight loss?
No. A larger calorie deficit can make a diet harder to maintain and may affect hunger, recovery and training performance.
Why am I not losing weight at my calculated calories?
Your actual energy needs may differ from the estimate, or calorie intake may be higher than expected. Monitor consistent intake and average weight trends before making gradual adjustments.
Can I use this calculator for muscle gain?
Yes. The calculator provides a starting calorie target approximately 10% above estimated maintenance calories.
Do calories matter more than macros?
Calories and macros answer different questions. Energy balance is particularly important for changes in body weight, while macro intake helps determine the composition of your diet.
Disclaimer
The Calorie Calculator and information on this page are provided for general educational and fitness-planning purposes only.
Results are estimates and are not medical advice, diagnosis or a personalized nutrition prescription.
People with medical conditions, pregnancy, special dietary requirements, a history of eating disorders or other health concerns should seek guidance from an appropriately qualified healthcare professional.