Inputs
Estimate onlyNutrition planning panel
Add age, sex, height, weight, activity level, and a goal to estimate daily calories.
The calculation uses the Mifflin-St Jeor equation and an activity multiplier. Results are estimates only.
Health toolEstimated daily calories
Calorie Calculator
Use this calorie calculator to estimate daily calorie needs, compare maintenance calories, and choose a practical target for weight loss, weight maintenance, or muscle gain. The calculator starts with BMR, adjusts for activity to estimate TDEE, then shows goal targets so you can plan from a clear baseline instead of guessing.
Updated: May 10, 2026
Looking for a related estimate? Try Maintenance Calories Calculator or TDEE Calculator.
What you will get
Clear input, result, and explanation in one place
Estimated daily calories
The result shows BMR, maintenance calories, and practical goal targets in one place.
Calorie needs are estimates only. Actual needs vary with body composition, training load, health status, and daily routine.
Calculator
Enter your values and review the result
Result
Estimated daily calories
Main estimate
2,755 kcal
Estimated maintenance calories based on 178 cm, 32 years old, and moderately active.
Current goal target: 2,755 kcal for maintenance.
BMR
1,778 kcal
Resting calorie baseline.
Maintenance
2,755 kcal
Estimated daily calories to maintain weight.
Mild loss
2,505 kcal
Smaller deficit target.
Weight loss
2,255 kcal
Common deficit target.
Weight gain
3,005 kcal
Moderate surplus target.
Goal target
2,755 kcal
Your selected goal: Maintenance.
Mild loss
A small deficit.
2,505 kcal
Weight loss
A common deficit target.
2,255 kcal
Maintenance
Energy balance baseline.
2,755 kcal
Weight gain
Moderate surplus.
3,005 kcal
Macro preview
Protein
148 g
Carbs
310 g
Fat
92 g
Weekly interpretation
- Maintenance reflects the selected activity factor of 1.55.
- A maintenance target changes intake by about 0 kcal per day.
- Actual needs vary with body composition, routine, and how consistent your activity is from week to week.
These are estimates only. Sustainable progress is usually better than forcing very low intake targets.
Calculator purpose
What a calorie calculator does
A calorie calculator gives you a practical estimate of how much energy you may need each day. It is most useful as a planning reference when you want to compare your current intake with maintenance calories, a weight-loss target, or a muscle-gain target.
Formula
How calorie needs are estimated
This page uses the Mifflin-St Jeor equation to estimate BMR, then applies an activity multiplier to approximate total daily energy expenditure. From that maintenance estimate, it applies a goal adjustment for weight loss, maintenance, or weight gain planning.
Resting energy
What BMR means
BMR stands for basal metabolic rate. It is the energy your body uses at rest to keep essential processes running. It is not the same as the calories you need in a normal day, but it is the starting point for the maintenance estimate and a useful comparison with a dedicated BMR calculator.
Maintenance
What maintenance calories mean
Maintenance calories are the approximate amount of food energy that keeps your weight relatively stable when your routine stays similar. They are a planning estimate, not a perfect daily number, because real life changes from week to week. If you only want the stable baseline, use the maintenance calories calculator as a focused next step.
Activity
How activity level affects calorie needs
Activity level changes the estimate because movement, training, and physical work all increase energy use. Sedentary, lightly active, moderately active, and very active routines can produce very different calorie targets even for people with the same age, height, and weight.
Goals
Calorie deficit vs calorie surplus
A calorie deficit is used when you want to lose weight, while a calorie surplus is used when you want to gain weight or support muscle gain. The size of the change matters. Smaller adjustments are usually easier to sustain than aggressive targets that feel difficult to maintain.
Muscle gain
How many calories to eat to gain muscle
A muscle-gain target usually works better as a small surplus rather than a very large increase. A modest surplus can support training and recovery while limiting unnecessary fat gain. Pair the calorie target with enough protein, progressive resistance training, and realistic progress tracking.
Weight loss
How many calories to eat to lose weight
A moderate deficit is often more practical than a very low calorie target. A large cut can be hard to follow, may affect energy and training, and often becomes less sustainable. The calculator therefore shows a milder and a standard loss target, and you can compare the result with the weight loss calculator if you want a timeline estimate.
Safety
Why very low calorie targets can be problematic
Very low targets can make it harder to meet basic nutrition needs and can be difficult to follow consistently. This page keeps the estimate practical by showing a range of goal options instead of pushing one extreme number.
Comparison
Calorie calculator vs macro calculator
A calorie calculator helps you set the total daily energy target. A macro calculator goes further and splits that total into protein, carbohydrate, and fat. If you want the basic energy target first, the calorie calculator is the right starting point. If you already know the calorie target and want meal-planning structure, move to macros.
Professional guidance
When to speak with a doctor or dietitian
If you have a medical condition, a history of disordered eating, are pregnant, breastfeeding, recovering from illness, or unsure how to set a safe goal, a qualified professional can help you interpret calorie targets in a more individual way.
Common questions
It is useful as a planning estimate, but it still relies on formula assumptions and cannot account for every personal factor.
BMR is the amount of energy your body uses at rest to keep basic functions going.
BMR estimates calories used at rest, while TDEE adds activity and movement to estimate total daily calorie needs.
Maintenance calories are the estimated amount you need to eat to keep your weight roughly stable at your current activity level.
A moderate deficit is usually more practical than a very aggressive cut, because it is easier to follow and maintain.
A small surplus above maintenance is usually a practical starting point for muscle gain when paired with enough protein and progressive training.
Many people start with a smaller deficit first, then adjust if progress is too slow or too hard to maintain.
People with the same height and weight can need very different calorie intakes if their movement and training habits differ.
No. A macro calculator usually splits calories into protein, carbs, and fat after the calorie target is set.
Yes. Age, sex, body composition, activity, and routine can all change daily calorie needs.
Helpful guide
How many calories should I eat per day?
Learn calorie basics, BMR vs TDEE, maintenance, deficit, surplus, and common mistakes with practical links to the right calculators.
Read guideRelated Calculators
Health
Maintenance Calories Calculator
Estimate the calories needed to maintain your current weight, compare activity levels, and use the result as a practical baseline for diet planning.
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TDEE Calculator
Estimate total daily energy expenditure from your age, weight, height, sex, and activity level.
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Calorie Deficit Calculator
Estimate your daily calorie target, weekly weight-loss pace, and calorie deficit plan from maintenance calories.
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Macro Calculator
Calculate daily protein, carb, and fat grams for fat loss, maintenance, or muscle gain from calories, activity, and body metrics.
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Weight Loss Calculator
Estimate a weight loss target from your maintenance calories and a chosen daily deficit.
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BMI Calculator
Check an adult BMI estimate, review the healthy weight range for your height, and switch between Metric and US inputs in a clear layout.
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