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Daily Calorie Needs Calculator
TDEE Calculator — estimate adult BMR and daily energy expenditure from age, height, weight and activity assumptions. For general adult informational use.
Estimate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using your age, height, weight and selected activity level.
TDEE is an estimate. Real energy needs vary with body composition, activity, training, health, physiology and other individual factors.
For general adult informational use.
Choose a mode and unit system. Each unit system retains its own entered values; switching units does not convert the input fields. Imperial measurements are converted to metric at full precision for the equation. Activity categories are broad planning assumptions. This tool estimates energy expenditure, not how many calories an individual should consume.
Calculations run locally in your browser. Your inputs are not saved.
Enter your measurements and activity assumptions.
Example Daily Energy Estimate
Static example: Male formula, age 35, height 175 cm and weight 75 kg. BMR = 10 × 75 + 6.25 × 175 − 5 × 35 + 5 = 750 + 1,093.75 − 175 + 5 = 1,673.75 kcal/day, displayed as 1,674 kcal/day. With the Moderately Active multiplier of 1.55, estimated TDEE = 1,673.75 × 1.55 = 2,594.3125 kcal/day, displayed approximately as 2,594 kcal/day.
About this calculator
How the equation estimates energy expenditure
The Mifflin–St Jeor equation estimates BMR using weight in kilograms, height in centimetres and age. The Male equation adds 5; the Female equation subtracts 161. The formula sex input only selects the equation constant.
- Male equation: 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5.
- Female equation: 10 × weight (kg) + 6.25 × height (cm) − 5 × age − 161.
- Imperial measurements convert using kilograms = pounds ÷ 2.2046226218 and centimetres = (feet × 12 + inches) × 2.54. Converted values are not rounded before calculation.
- Estimated TDEE = estimated BMR × selected activity multiplier. It is an estimate of daily energy expenditure, not a calorie prescription.
Activity categories are broad planning assumptions
These descriptions do not precisely identify the correct multiplier for an individual.
- Sedentary (1.2): Mostly seated / relatively little structured activity.
- Lightly Active (1.375): Some regular activity.
- Moderately Active (1.55): Regular moderate activity.
- Very Active (1.725): High level of regular activity.
- Very Highly Active (1.9): Very high sustained activity level.
Illustrative uncertainty range only
The ±10% range is shown only to reinforce that the calculated value is an estimate. It is not a clinical confidence interval or prescribed intake range. Body composition, activity, training, health, physiology and other individual factors may cause actual energy needs to differ.
About the calculator name
This Daily Calorie Needs Calculator is also called the TDEE Calculator, Calorie Needs Calculator or Daily Energy Needs Calculator. All names refer to the same informational energy-expenditure estimate.
Frequently asked questions
What is TDEE?
Total Daily Energy Expenditure is the estimated energy used over a day, including energy used at rest and during activity.
What is BMR?
Basal Metabolic Rate estimates energy used by the body at rest under standardized conditions. It is not an exact measurement of an individual’s metabolism.
How is TDEE estimated?
This calculator multiplies estimated BMR by the activity multiplier selected by the user. The result is a general daily-energy estimate in kcal/day.
What is the Mifflin–St Jeor equation?
It is an equation estimating BMR from weight, height and age with sex-specific constants. This calculator uses 10 × kilograms + 6.25 × centimetres − 5 × age, then adds 5 for the Male formula or subtracts 161 for the Female formula.
Why can actual calorie needs differ from TDEE estimates?
Body composition, activity patterns, training, health, physiology and other individual factors vary. The formula and activity multiplier cannot capture every factor.
What does activity level mean?
Each activity category supplies a broad planning multiplier. Its description is not a precise assessment of an individual’s activity or a recommendation of which level to select.
Is TDEE the same as a calorie prescription?
No. This calculator estimates daily energy expenditure. It does not prescribe how many calories an individual should consume.
This tool provides general informational estimates and is not medical or nutritional advice. Individual energy needs can vary substantially. People with medical conditions, pregnancy, nutritional concerns, or specific dietary goals should seek guidance from an appropriately qualified healthcare professional.