One number, three paths
Your calorie target starts with maintenance, then moves up or down by goal.
The widely cited 2,000 kcal/day value is a label reference, not a personal prescription. Your real target depends on body size, age, sex, and how much you move.
Lose fat
TDEE - 300 to 500
Controlled deficit
Maintain
TDEE
Baseline target
Gain muscle
TDEE + 250 to 500
Controlled surplus
Quick answer: how many calories should you eat per day?
Featured snippet answer
A 25-year-old male athlete training six days per week may need more than 3,500 kcal/day. A sedentary 55-year-old woman may maintain closer to 1,600 kcal/day. If either person blindly uses 2,000 kcal/day, the plan is already pointed in the wrong direction.
The practical process is simple: estimate maintenance calories, decide whether you want to lose fat, maintain, or gain muscle, then track the scale trend for two weeks and adjust in small steps.
Find your personal daily calorie target
Use this light version to get an immediate estimate. The button opens the full Macro Calculator with your details prefilled, so you can continue into protein, carb, and fat targets without entering everything again.
Personal calorie calculator
Based on the Mifflin-St Jeor equation. Open the full calculator to adjust macro split, diet style, and share the result.
Your estimate
BMR
1,375 kcal
Maintenance
1,891 kcal
Target range
1391-1591 kcal/day
Calculate My Calories and MacrosCalorie targets by goal
Fat loss
How many calories per day to lose weight?
TDEE - 300 to 500 kcal
To lose weight, eat fewer calories than you burn. A 400-500 kcal daily deficit is the usual starting point because it is large enough to move body weight while still being sustainable.
During a cut, aim for roughly 2.0-2.4g protein per kg of body weight.
Maintenance
How many calories per day to maintain weight?
TDEE
To maintain weight, eat close to your TDEE. This number is the baseline that makes every fat-loss or muscle-gain adjustment more precise.
Muscle gain
How many calories per day to build muscle?
TDEE + 250 to 500 kcal
To build muscle, use a controlled surplus. Eating far above maintenance does not bypass the physiological limit on muscle growth; it mostly increases fat gain.
How many calories per day to lose weight?
To lose weight, eat fewer calories than you burn. A 500 kcal/day deficit is often used as the classic target because it adds up to about 3,500 kcal per week, but 300-400 kcal/day is often easier to sustain and better for training performance.
| Daily deficit | Expected change | Best for | Note |
|---|---|---|---|
| 200-300 kcal deficit | 0.2-0.3 kg/week | Final-stage dieting or people close to goal weight | - |
| 400-500 kcal deficit | 0.4-0.5 kg/week | Most fat-loss phases | Recommended default |
| 600-750 kcal deficit | 0.6-0.75 kg/week | Larger bodies or short, carefully monitored phases | - |
| >1,000 kcal deficit | >1 kg/week | Not a default plan | Higher muscle-loss and rebound risk |
Minimum intake
How many calories per day to maintain weight?
Maintenance calories are your TDEE: the calories your body burns across resting metabolism, normal movement, and exercise. It is the baseline for every other target. When maintenance is wrong, fat-loss and muscle-gain numbers inherit the error.
How many calories per day to build muscle?
Muscle gain needs a calorie surplus, but more is not automatically better. A controlled 250-500 kcal/day surplus gives training and recovery enough energy while limiting unnecessary fat gain.
| Daily surplus | Expected change | Best for | Note |
|---|---|---|---|
| 150-250 kcal surplus | 0.5-1 kg/month | Lean gaining or advanced trainees | - |
| 250-500 kcal surplus | 1-2 kg/month | Most muscle-gain phases | Recommended default |
| 500-750 kcal surplus | 1.5-2.5 kg/month | Beginners with high training consistency | - |
| >1,000 kcal surplus | More scale weight, not much more muscle | Not recommended | High fat-gain risk |
Daily calorie needs by sex and age
These ranges are reference estimates for adults, not a diagnosis of your personal maintenance. They are useful for orientation, but your exact target can easily differ by 300 kcal/day or more.
Men: estimated calories per day
| Age | Sedentary | Light | Moderate | High |
|---|---|---|---|---|
| 18-25 | 2,400 | 2,600 | 2,800 | 3,000-3,200 |
| 26-35 | 2,400 | 2,600 | 2,800 | 3,000 |
| 36-45 | 2,200 | 2,400 | 2,600 | 2,800 |
| 46-55 | 2,200 | 2,400 | 2,600 | 2,800 |
| 56-65 | 2,000 | 2,200 | 2,400 | 2,600 |
| 65+ | 2,000 | 2,200 | 2,400 | - |
Women: estimated calories per day
| Age | Sedentary | Light | Moderate | High |
|---|---|---|---|---|
| 18-25 | 1,800 | 2,000 | 2,200 | 2,400 |
| 26-35 | 1,800 | 2,000 | 2,200 | 2,400 |
| 36-45 | 1,800 | 2,000 | 2,200 | 2,400 |
| 46-55 | 1,600 | 1,800 | 2,000 | 2,200 |
| 56-65 | 1,600 | 1,800 | 2,000 | 2,200 |
| 65+ | 1,600 | 1,800 | 2,000 | - |
Use this correctly
How to calculate your personal calorie needs
Calculate BMR with Mifflin-St Jeor
Use weight, height, age, and sex to estimate resting energy needs.
Multiply BMR by an activity factor
Apply an activity multiplier from 1.2 to 1.9 to estimate Total Daily Energy Expenditure.
Adjust calories by goal
Eat below TDEE for fat loss, equal to TDEE for maintenance, or above TDEE for muscle gain.
Mifflin-St Jeor BMR equation
Men: 10 x weight(kg) + 6.25 x height(cm) - 5 x age + 5
Women: 10 x weight(kg) + 6.25 x height(cm) - 5 x age - 161
Worked example
30-year-old male, 75kg, 175cm: BMR = 1,699 kcal. With moderate activity, TDEE = 2,633 kcal/day.
Fat-loss target: 2,133 kcal. Muscle-gain target: 2,933 kcal.
Activity multipliers
Sedentary
Desk job, little exercise
x 1.2
Lightly Active
Light exercise 1-3 days per week
x 1.375
Moderately Active
Moderate exercise 3-5 days per week
x 1.55
Very Active
Hard exercise 6-7 days per week
x 1.725
Extremely Active
Physical job plus hard training
x 1.9
Skip the math
Personal calorie calculator
Based on the Mifflin-St Jeor equation. Open the full calculator to adjust macro split, diet style, and share the result.
Your estimate
BMR
1,375 kcal
Maintenance
1,891 kcal
Target range
1391-1591 kcal/day
Calculate My Calories and Macros6 factors that determine how many calories you need
01
Body size and weight
Larger bodies require more energy to maintain and move. This is why calorie targets usually fall as weight drops.
02
Age
Resting energy needs tend to decline with age due to changes in lean mass, movement, and tissue metabolism.
03
Sex
Men generally have higher calorie needs because average lean mass is higher, but individual body composition matters more than the label alone.
04
Activity level
Activity is the most changeable part of TDEE. Choosing too high an activity multiplier can overstate needs by hundreds of calories.
05
Muscle mass
Lean tissue is more metabolically active than fat tissue, so two people at the same scale weight can have different calorie needs.
06
Hormones and metabolic adaptation
Thyroid status, stress, sleep, and long dieting phases can shift real-world expenditure away from formula estimates.
5 common calorie mistakes that stall progress
Mistake 1
Overestimating activity level
Impact: A too-high multiplier can inflate TDEE by 200-400 kcal and quietly erase a fat-loss deficit.
Fix: If you are between two activity levels, choose the lower one and adjust after two weeks of scale trend data.
Mistake 2
Ignoring liquid calories
Impact: Lattes, juice, soda, smoothies, and alcohol add calories without much fullness.
Fix: Track drinks the same way you track food, or choose mostly water, unsweetened tea, black coffee, and zero-calorie options.
Mistake 3
Not counting cooking oil
Impact: Two tablespoons of oil can add roughly 240 kcal before the meal even reaches the plate.
Fix: Weigh oil in grams or use a measured spoon instead of pouring by eye.
Mistake 4
Letting weekends erase weekdays
Impact: Five disciplined weekdays can be cancelled by two high-calorie weekend days.
Fix: Budget flexible calories intentionally instead of treating weekends as untracked.
Mistake 5
Setting an extreme deficit
Impact: Very low calories increase hunger, muscle loss, nutrient gaps, fatigue, and rebound risk.
Fix: Start with a 400-500 kcal deficit unless a clinician gives you a different plan.
Special considerations for different groups
Pregnancy and lactation
Energy needs are usually unchanged in the first trimester, then commonly rise by about 340 kcal/day in the second trimester and about 450 kcal/day in the third trimester. Lactation can require roughly 500 extra kcal/day.
Pregnancy and lactation targets should be set with a clinician or registered dietitian, not from a generic online estimate.
Competitive athletes
High-volume athletes can need 4,000-6,000 kcal/day or more. Standard activity multipliers become less reliable at that output level.
Use sport-specific nutrition support when training volume is high.
Adults over 65
Calories often decline with age, but protein quality matters more. Many older adults benefit from higher protein emphasis to protect muscle.
Medical conditions, appetite changes, and medications can change needs.
FAQ
Source notes
Formula and reference context draw on the Mifflin-St Jeor resting metabolic rate equation, the FDA Nutrition Facts label calorie reference, USDA FoodData Central, and current Dietary Guidelines materials. These sources support estimates; they do not replace medical or dietitian guidance.
Next step
Calculate your exact calorie and macro targets
Use the full calculator to turn daily calories into protein, carbs, and fat, then bring those targets into your meal prep or homemade recipe tracking.