How to use the tdee calculator
Prepare the values for this calculation
Estimate total daily energy expenditure from Mifflin–St Jeor BMR and an activity multiplier. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Sex used by equation: choose Male, Female. Match this selection to the data you enter.
- Age (years): enter a value at least 18 and no more than 120 and a whole number. Use the unit named in the label or selected above. Do not leave this required field blank.
- Weight (kg): enter a value at least 20 and no more than 400. Use the unit named in the label or selected above. Do not leave this required field blank.
- Height (cm): enter a value at least 80 and no more than 250. Use the unit named in the label or selected above. Do not leave this required field blank.
- Activity level: choose Sedentary, Lightly active, Moderately active, Very active, Extra active. Match this selection to the data you enter.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Estimated TDEE first. With the unchanged example inputs, it is 2633 kcal/day. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Age (years) from 30 to 33. The resulting Estimated TDEE is 2610 kcal/day. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
TDEE Calculator formula
TDEE = Mifflin–St Jeor BMR × selected activity factor.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Sex used by equation | Select an option | Male |
| Age (years) | minimum 18; maximum 120; whole number | 30 |
| Weight (kg) | minimum 20; maximum 400 | 75 |
| Height (cm) | minimum 80; maximum 250 | 175 |
| Activity level | Select an option | Moderately active |
Worked example
Using the example inputs above, the estimated tdee is 2633 kcal/day.
- Estimated TDEE
- 2633 kcal/day
- Estimated BMR
- 1699 kcal/day
- Activity factor
- 1.55
Results and assumptions
Energy needs vary. This is an estimate, not a medical prescription.
Fix an input or unexpected result
Age (years) is required. Enter age (years) using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.