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Health

TDEE Calculator

Total Daily Energy Expenditure based on BMR and activity. Free online TDEE Calculator for health — instant, accurate results, mobile-friendly, no signup needed.

TDEE = BMR × activity multiplier.
TDEE (kcal/day)
2,635

Derivation

  1. ├── 01Givenbmr = 1700, mult = 1.55
  2. ├── 02Formulat × a
  3. └── 03Compute TDEE (kcal/day)2,635
Did you know?

TDEE = BMR × activity factor. The 1.2–1.9 multiplier range can be the difference between 1,800 and 2,800 kcal/day.

§01What is

Understanding the TDEE Calculator

The TDEE Calculator computes TDEE (kcal/day) from 2 inputs: bmr, activity. Total Daily Energy Expenditure based on BMR and activity.

Health metrics give us objective checkpoints against a body that can feel unreliable. Used alongside professional guidance — not in place of it — these numbers help you track progress and spot trends that matter. The TDEE Calculator sits in that toolkit — it total Daily Energy Expenditure based on BMR and activity. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

t × a

Where

bmr
BMR
mult
Activity — one of: Sedentary, Light, Moderate, Very Active, Extra Active
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: BMR = 1700, Activity = 1.55.

  1. 01Start by noting the input — BMR: 1700.
  2. 02Start by noting the input — Activity: 1.55 (a category, not a number).
  3. 03Substitute these values into the formula: t × a
  4. 04Compute TDEE (kcal/day): the calculator returns 2635.
  5. 05Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common TDEE Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

BMR halved

bmr = 850 (from 1700)

Keep every other input at its default and halve the bmr. See how tdee (kcal/day) responds.

  1. 01New BMR: 850
  2. 02Baseline TDEE (kcal/day): 2635
  3. 03New TDEE (kcal/day): 1317.5
  4. 04TDEE (kcal/day) decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

BMR doubled

bmr = 3400 (from 1700)

Keep every other input at its default and double the bmr. See how tdee (kcal/day) responds.

  1. 01New BMR: 3400
  2. 02Baseline TDEE (kcal/day): 2635
  3. 03New TDEE (kcal/day): 5270
  4. 04TDEE (kcal/day) increases by 100% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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