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BMR Calculator (Mifflin-St Jeor) – Daily Calories at Rest

What is BMR?

 

BMR (Basal Metabolic Rate) represents the number of calories your body burns at complete rest to maintain vital functions such as:

  • Breathing

  • Circulation

  • Cell production

  • Brain activity

  • Body temperature regulation

👉 It is the minimum energy your body needs to stay alive.

Why is BMR important?

 

Knowing your BMR helps you:

✔ Understand your body’s base calorie needs
✔ Calculate your TDEE accurately
✔ Plan weight loss or muscle gain
✔ Avoid extreme dieting
✔ Optimize your metabolism

 

Who should use this calculator?

 

  • People trying to lose weight

  • Fitness enthusiasts

  • Bodybuilders

  • Athletes

  • Anyone tracking calories

 How to Use the BMR Calculator

 

Enter your personal details

 

Fill in:

  • Gender

  • Age

  • Weight

  • Height

The calculator will instantly display:

👉 Your Basal Metabolic Rate (calories burned at rest)

BMR Calculator – Find Your Basal Metabolic Rate
Please select your sex.
Enter age (10–110).
Enter weight (20–300 kg).
Enter height (100–250 cm).
Your Basal Metabolic Rate
—
kilocalories per day
This is the number of calories your body needs at complete rest.
🔥
Resting Energy
—
kcal/day (100%)
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Sedentary Estimate ? BMR × 1.2 — estimated daily calories for someone with a desk job and little to no exercise.
—
kcal/day (×1.2)
Resting Energy Breakdown ? Your BMR represents 100% of your resting calorie needs. Activity multipliers build on top of this foundation. 100%
Your BMR accounts for ~60–70% of your total daily energy expenditure (TDEE).
💡
Loading your insight…
📊
Ready to go deeper? Try our TDEE Calculator →
Add activity level for your total daily burn
›

Formula: Mifflin-St Jeor — the most clinically validated BMR equation.

Results are estimates. Consult a healthcare professional for personalised advice.

Use your result

  • Use BMR as base for calculating TDEE

  • Multiply BMR by activity level for full calorie needs

  • Build your diet plan based on total energy needs

FAQ 

❓ What is the difference between BMR and TDEE?

BMR is the calories burned at rest, while TDEE includes daily activity and exercise.

❓ Is the Mifflin-St Jeor formula accurate?

Yes, it is one of the most accurate and widely used equations in nutrition science.

❓ Can I lose weight using BMR?

BMR alone is not enough — you need to calculate TDEE and create a calorie deficit.

❓ How often should I recalculate BMR?

Recalculate whenever your weight, age, or body composition changes.

🚀  CTA 

👉 Start by calculating your BMR and take the first step toward a smarter nutrition plan.

Next step: Calculate your TDEE →

For additional guidance on healthy and sustainable weight loss, you can explore the official resources provided by the NHS (National Health Service). These evidence-based recommendations cover balanced nutrition, portion control, and physical activity to help you achieve long-term results.

👉 Learn more here: https://www.nhs.uk/better-health/lose-weight/

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