Calculator0
Calorie Calculator
Use our free Calorie Calculator to estimate daily calorie intake, BMR and TDEE from your age, sex, height, weight, activity level and goal.
Use our free Calorie Calculator to estimate daily calorie intake, BMR and TDEE from your age, sex, height, weight, activity level and goal.
Enter sex, age, height and weight, choose the activity level that best reflects your usual week, then choose the goal. Calculator0 first estimates BMR, multiplies BMR by the activity factor to estimate TDEE, and then applies the current goal adjustment used by the tool.
Use the result as an estimate, not a measured metabolism. Real energy needs vary between people and can change with body composition, training, illness, medications and other factors.
| Term | Meaning | How Calculator0 uses it |
|---|---|---|
| BMR | Estimated energy used at rest | Calculated from Mifflin–St Jeor |
| TDEE | Estimated total daily energy expenditure | BMR × activity factor |
| Daily target | Planning intake based on selected goal | TDEE with the tool’s goal adjustment |
A common search mistake is to treat BMR as the number of calories needed for an ordinary day. BMR describes a resting baseline; TDEE attempts to account for activity across the day.
The current tool uses the Mifflin–St Jeor equations shown below. Weight is entered in kilograms, height in centimeters and age in years.
| Activity level | Factor |
|---|---|
| Sedentary | 1.20 |
| Light activity | 1.375 |
| Moderate activity | 1.55 |
| Active | 1.725 |
| Very active | 1.90 |
Choose the level that represents your overall routine, not the hardest workout you completed once. Overestimating activity is one of the fastest ways to push a TDEE estimate too high.
Maintenance aims to use the estimated TDEE without an intentional surplus or deficit. The current Calculator0 goal logic adjusts that TDEE for the selected goal. Because the result is algorithmic, it should be compared with real body-weight trends over time rather than assumed to be exact.
For weight change, short-term scale movement can be affected by water, glycogen, food volume and sodium. A single day is not enough to validate or invalidate a calorie estimate.
This “calculate → observe → adjust” approach acknowledges that equations estimate population averages while individual energy expenditure can differ.
Suppose the calculator estimates a BMR of 1,500 kcal/day and you choose moderate activity (1.55).
That 2,325 kcal/day figure is an estimated maintenance level before the tool applies a selected goal. It is not a guarantee that body weight will remain perfectly stable at exactly that intake.
Because many of these factors are not directly measured by a simple web calculator, the output should be interpreted as a planning estimate.
Calories answer the energy question; protein answers one macronutrient-planning question. They are related but not interchangeable. If you are looking for a macros and calories calculator, note that this page estimates energy and explains macronutrient calorie values but does not prescribe a complete macro split. After estimating TDEE and a daily calorie target, use the Protein Calculator if you also want a separate protein target based on the logic in that tool.
The combination can help organize a meal plan, but it does not automatically specify carbohydrate, fat, fiber, vitamins or minerals.
Accurate inputs and realistic interpretation matter more than adding extra decimal places to the result.
BMR equations use measurable inputs, but TDEE also depends on the activity multiplier you choose. Two people with the same age, height and weight can have meaningfully different daily expenditure because of occupation, walking, training volume, recovery and spontaneous movement.
Choose the activity level that best represents a normal week rather than the hardest workout you completed recently. If you are between two levels, treat the result as a starting range rather than false precision. Consistent body-weight and intake trends over time provide feedback that a one-time equation cannot.
A calorie calculator is therefore best used as an initial planning estimate. It is not a metabolic test and it cannot measure individual energy expenditure directly.
Body weight can change from day to day because of water, glycogen, sodium, food volume and other short-term factors. When evaluating whether an estimated calorie target is close to maintenance, compare trends over a longer period rather than reacting to one morning’s measurement.
Keep the method consistent: similar weigh-in conditions, a stable activity pattern where possible, and enough time to observe a trend. If your real-world trend repeatedly differs from the estimate, the practical maintenance level may be higher or lower than the equation predicted.
The calculator’s result is general information, not a prescription for pregnancy, eating disorders, disease treatment or other situations that require individualized clinical guidance.
Choose the option that best represents a normal week, including both structured exercise and routine movement. A desk job with three short workouts is different from a physically demanding occupation plus training, even if both people exercise several times per week.
| Selection | Factor used by this calculator | Practical interpretation |
|---|---|---|
| Sedentary | 1.20 | Little structured activity and generally low daily movement |
| Light | 1.375 | Some regular activity but not a highly active routine |
| Moderate | 1.55 | Consistent activity across the week |
| Active | 1.725 | High routine movement or frequent demanding training |
| Very active | 1.90 | Very high training and/or occupational activity |
If you are between categories, treat the output as a range and calibrate it with real-world trends.
A maintenance estimate is best tested over time. Keep food tracking and weigh-in conditions reasonably consistent, then compare the trend over several weeks. If average body weight is stable, the observed intake may be close to practical maintenance. If it trends upward or downward consistently, actual maintenance may differ from the equation.
Short-term scale changes are heavily influenced by water, glycogen, sodium, food volume and bowel contents, so one or two days are not enough to judge the estimate.
A deficit means average energy intake is below average expenditure; a surplus means it is above. The arithmetic is simple, but actual body-weight response is not perfectly linear because energy expenditure, water balance and adherence can change over time.
In nutrition, the word “Calorie” with a capital C normally means one kilocalorie (kcal). Some countries display food energy in kilojoules (kJ). The units measure the same underlying quantity of energy.
If a label lists both units, use one consistently when totaling a day. Do not add kcal and kJ values together without converting them to the same unit first.
Protein, carbohydrate and fat contribute energy to food. A common nutrition approximation is 4 kcal per gram for protein, 4 kcal per gram for carbohydrate and 9 kcal per gram for fat. Alcohol contributes about 7 kcal per gram, though it is not an essential nutrient.
| Component | Approximate energy |
|---|---|
| Protein | 4 kcal/g |
| Carbohydrate | 4 kcal/g |
| Fat | 9 kcal/g |
| Alcohol | 7 kcal/g |
These factors help explain how a food’s macronutrient composition relates to its energy content, but food-label values can include rounding and fiber-related differences.
Daily expenditure includes more than resting metabolism. Walking, standing, work, exercise, fidgeting and the energy used to digest food all contribute. Two people with similar BMR values can therefore have different TDEE values if their movement patterns differ.
This is one reason an equation should be treated as a starting point rather than a direct measurement of metabolism.
Food labels, restaurant estimates, portion sizes and home measurements all have uncertainty. Recording intake to the nearest single calorie can create an impression of precision that the source data does not support. Consistency matters more than pretending every value is exact.
For packaged foods, use the label and actual portion. For recipes, add the ingredients and divide by the number of portions. For foods without labels, a reputable food-composition database can provide a reasonable estimate.
Pregnancy, lactation, growth, eating disorders, significant illness, major weight changes and some medications can make generic calorie equations inappropriate. Children and adolescents also require age-appropriate assessment rather than adult planning assumptions.
For a diagnosed condition or a situation where nutrition changes could carry medical risk, individualized guidance from a qualified clinician or registered dietitian is more appropriate.
Enter sex, age, height, weight and activity level. Calculator0 estimates BMR with Mifflin–St Jeor and then estimates TDEE with an activity factor.
BMR is an estimate of the energy your body uses at rest.
TDEE is an estimate of total daily energy expenditure after activity is considered.
The current calculator uses the Mifflin–St Jeor equation.
The current options use 1.20, 1.375, 1.55, 1.725 and 1.90 from sedentary through very active.
No. They are estimates based on equations and self-reported inputs.
Body composition, daily movement, training, health, measurement error and individual variation can all change actual expenditure.
No. Choose the level that best represents your overall routine and typical week.
Use this page for calorie/TDEE estimates and the Protein Calculator for a separate protein target.
Use consistent measurements over time rather than judging the estimate from a single day, because body weight can fluctuate for many short-term reasons.
No. It is an informational estimate and does not replace individualized medical or dietetic advice.
In nutrition, one Calorie normally means one kilocalorie, or 4.184 kilojoules.
Daily movement, occupation, exercise and other activity can make total expenditure different.
Track intake and body-weight trends consistently over several weeks rather than judging one or two days.
A common approximation is 4 kcal/g for protein, 4 kcal/g for carbohydrate and 9 kcal/g for fat.
Children and adolescents need age-appropriate nutrition assessment rather than a generic adult planning equation.