TDEE Calculator
Calculate TDEE, maintenance calories, BMR, and activity-factor scenarios with editable assumptions, three equations, charts, metrics, and a PDF report.
Enter your measurements and activity assumptions
TDEE calculator inputs
Estimated TDEE2,728Calories/day · factor 1.55
Activity-factor scenarios
All three values use your selected formula and calibration adjustment.
| Scenario | Activity factor | Estimated TDEE |
|---|---|---|
| Lower factor | 1.35 | 2,376 Calories/day |
| Selected factor | 1.55 | 2,728 Calories/day |
| Higher factor | 1.75 | 3,080 Calories/day |
BMR and TDEE by formula
Each formula uses the same measurements and selected activity factor.
Activity-factor sensitivity
The range comes from your selected factor and editable comparison interval.
Adult educational estimate only. TDEE is not a direct metabolic measurement, diagnosis, or individualized calorie prescription. Do not use this calculator for children, pregnancy, breastfeeding, illness, eating-disorder care, or medical nutrition therapy.
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What does the TDEE Calculator calculate?
The TDEE Calculator converts the values you enter into a structured estimate using the formulas and assumptions documented on this page. Use the result to compare scenarios, review the calculation details, and identify sensitive inputs. Check the guide and formula sections before using the estimate for an important decision.
At a Glance
- Estimate adult total daily energy expenditure from BMR and an editable activity factor.
- Compare Mifflin-St Jeor, revised Harris-Benedict, and Katch-McArdle.
- See lower, selected, and higher activity-factor scenarios.
- Inspect weekly, hourly, resting, and above-resting energy metrics.
- Use U.S. customary or metric measurements and Calories or kilojoules.
- Treat the result as a planning estimate, not a measured calorie prescription.
History of TDEE Estimation
Total daily energy expenditure combines resting energy with the energy associated with daily activity and food processing. Because direct measurement requires specialized methods, planning tools commonly begin with a published resting-energy equation and apply a physical activity level.
Mifflin and colleagues published a resting-energy equation in 1990. Revised Harris-Benedict coefficients were published in 1984. Modern tools such as the NIDDK Body Weight Planner use more detailed dynamic modeling for weight planning, while this calculator deliberately presents a transparent static TDEE estimate.
What This TDEE Calculator Does
The calculator normalizes height and weight, estimates BMR with all three supported equations, multiplies the selected BMR by the activity factor, and applies any user-entered calibration percentage. Use realistic inputs and review the TDEE Calculator assumptions before relying on this result for decisions.
It also calculates lower and higher activity scenarios, energy per week and hour, energy above the resting estimate, and the portion of estimated TDEE above BMR.
Who Should Use It
For “Who Should Use It,” the TDEE Calculator organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.
- Adults who want a transparent starting estimate of maintenance calories.
- People comparing how activity factors change daily energy estimates.
- Students learning the relationship among BMR, physical activity level, and TDEE.
- Adults calibrating a planning estimate against a consistent observed trend.
The calculator is not designed for children, pregnancy, breastfeeding, illness, eating-disorder care, or medical nutrition therapy.
Problems It Solves
- Converts pounds, feet, and inches to kilograms and centimeters.
- Runs three resting-energy equations from one measurement set.
- Makes the activity multiplier visible and editable.
- Shows sensitivity around the selected factor without changing it silently.
- Separates the uncalibrated estimate from an optional user adjustment.
- Provides tables alongside charts so results do not depend on color or interaction.
Key Benefits
Every assumption that changes the result is visible. The same tested engine powers the calculator, worked examples, widget, and PDF report. Formula and scenario tables help users understand why the result changes instead of presenting maintenance calories as a hidden preset.
TDEE Calculator Definitions
- TDEE
- Total daily energy expenditure, an estimate of energy used across a full day.
- BMR
- Basal metabolic rate, the selected resting-energy estimate used as the starting value.
- Activity factor
- A user-entered multiplier intended to represent average total daily activity.
- Base TDEE
- BMR multiplied by the selected activity factor before calibration.
- Calibration
- An optional percentage adjustment applied to the base TDEE and every activity scenario.
- Maintenance calories
- The intake that would match actual expenditure over time. Predicted TDEE is only a starting estimate of that value.
How TDEE Is Estimated
The selected Mifflin-St Jeor, revised Harris-Benedict, or Katch-McArdle equation first estimates BMR. The calculator then multiplies BMR by the entered activity factor and optional calibration multiplier. Use realistic inputs and review the TDEE Calculator assumptions before relying on this result for decisions.
TDEE = BMR × activity factor × (1 + calibration percentage ÷ 100)
Review the complete TDEE formulas for every coefficient and derived metric.
Understanding the Activity Factor
The activity factor is a broad multiplier for average daily movement, work, training, and other energy above the resting estimate. It is not a direct wearable measurement and is not determined by exercise sessions alone.
The NIDDK Body Weight Planner notes that typical physical activity level values often fall between 1.4 and 2.5. The calculator keeps the value editable because routines vary and a label cannot observe a person's actual expenditure.
Understanding Calibration
Calibration changes the complete TDEE estimate by the percentage entered. Leave it at zero unless a consistent record of intake and body-weight trends supports an adjustment. A single day, one scale reading, or a wearable estimate is not a stable basis for calibration.
When to Use It
Use this calculator when you need a reproducible adult maintenance-calorie starting point, want to compare resting-energy formulas, or need to see how a range of activity factors affects the result. Review the TDEE Calculator assumptions before relying on this result for decisions.
Use the BMR Calculator when the question is resting energy only. Use the Calorie Calculator when you want separate user-entered deficit and surplus scenarios.
How the Calculation Works
For “How the Calculation Works,” the TDEE Calculator organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.
- The calculator validates age, height, weight, body fat, formula, activity factor, scenario range, and calibration.
- U.S. measurements are converted to centimeters and kilograms.
- All three supported BMR equations run without intermediate display rounding.
- The selected BMR is multiplied by the activity factor.
- The calibration percentage is applied to the central and comparison scenarios.
- The engine derives weekly, hourly, and above-resting metrics.
- The charts and tables present the same formula and scenario values.
Common TDEE Calculator Mistakes
- Choosing an activity factor from exercise frequency alone.
- Entering a goal weight instead of current body weight.
- Adding exercise calories again after choosing an activity factor that already represents training.
- Using Katch-McArdle with a guessed body-fat percentage.
- Calibrating from a short or inconsistent observation period.
- Treating formula or activity scenarios as a guaranteed range.
- Assuming predicted TDEE is a direct metabolic measurement.
Frequently Asked Questions
What is TDEE?
Total Daily Energy Expenditure is an estimate of the energy your body uses across a full day, including resting needs and activity. For a useful TDEE Calculator result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.
Is TDEE the same as maintenance calories?
They are commonly used as the same planning estimate: the daily energy intake associated with maintaining current weight when the estimate matches actual expenditure. Use realistic inputs and review the TDEE Calculator assumptions before relying on this result for decisions.
How is TDEE calculated?
This calculator estimates BMR with the selected published equation, multiplies it by the activity factor you enter, and then applies any calibration percentage you enter. Use realistic inputs and review the TDEE Calculator assumptions before relying on this result for decisions.
Which activity factor should I use?
Choose a factor that reflects your average total activity across work, daily movement, and exercise. The NIH Body Weight Planner notes that typical physical activity levels often range from 1.4 to 2.5, but your factor remains editable here. Review the TDEE Calculator assumptions before relying on this result for decisions.
Why can my actual calorie needs differ?
Predictive equations and activity factors are population estimates. Body composition, movement, training, health, medication, food tracking, and measurement error can change the real value. Use realistic inputs and review the TDEE Calculator assumptions before relying on this result for decisions.
Can I use TDEE during pregnancy or for a child?
No. This adult estimator is not designed for children, pregnancy, breastfeeding, illness, or medical nutrition therapy. For a useful TDEE Calculator result, enter realistic values, compare relevant scenarios, check the calculation details, and review the definitions, assumptions, and limitations before using the estimate for an important decision.
Should I enter my current weight or goal weight?
Use current weight when estimating current energy expenditure. A goal weight does not describe the body mass your present BMR equation uses. For a useful TDEE Calculator result, use realistic inputs, compare relevant scenarios, and review the stated assumptions before making a decision.
Should I add exercise calories to TDEE?
Usually not when the activity factor already represents that exercise. Adding the same activity again can double count it. Keep the factor consistent with the period being estimated. Review the TDEE Calculator assumptions before relying on this result for decisions.
One Useful Fact
The weekly and hourly results contain no new activity assumptions. They are the selected daily TDEE multiplied by seven or divided by 24.
Conclusion
A TDEE calculator is most useful when its assumptions remain visible. Choose a defensible BMR equation and average activity factor, keep calibration at zero until evidence supports it, and compare the estimate with a consistent real-world trend.