BMR / TDEE and Calories Guide
Understand basal metabolism versus estimated daily calorie needs.
What it does and when to use it
BMR estimates calories your body uses at rest. TDEE adds daily activity and is more useful for nutrition planning.
What information to enter
Enter age, sex, height, weight and activity level. Choose a conservative activity level if unsure.
How to understand the result
The result is a starting point. Real weight change is affected by measurement error, water, glycogen, activity and sleep.
Recommended step-by-step workflow
- Check the assumptionsBMR estimates calories your body uses at rest. TDEE adds daily activity and is more useful for nutrition planning.
- Use matching unitsEnter age, sex, height, weight and activity level. Choose a conservative activity level if unsure.
- Compare with another scenarioThe result is a starting point. Real weight change is affected by measurement error, water, glycogen, activity and sleep.
Formula at a glance
Short example
Why this matters
BMR estimates calories your body uses at rest. TDEE adds daily activity and is more useful for nutrition planning.
Step by step
- Define exactly what you want to calculate and which unit is correct.
- Enter values as they appear on a document, receipt, payslip or real measurement.
- Compare at least one extra scenario to see whether the result is sensitive to small input changes.
Numeric example
A BMR of 1,700 calories with a 1.4 activity factor gives about 2,380 calories TDEE.
Mistakes to avoid
- Mixing numbers from different periods or units in one calculation.
- Ignoring assumptions, fees or limits the calculator cannot know by itself.
- Making a large decision from one result without testing a conservative scenario.
When to open the calculator
Open the calculator when you want to turn the explanation into a more exact number using your own inputs.
Common mistakes
- Mixing numbers from different periods or units in one calculation.
- Ignoring assumptions, fees or limits the calculator cannot know by itself.
Frequently Asked Questions
Is this a final answer?
Not always. It is a calculation or estimate based on the values entered.
What should I check before relying on it?
Check units, dates, fees and whether an important personal detail is missing.
Are my inputs saved?
No. The calculation runs in the browser and does not store your personal inputs.