BMR Calculator
Calculate calories your body burns at complete rest.
⚛️ BMR = Basal Metabolic Rate. The minimum energy your body needs at complete rest.
What Is This Tool?
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest, just to keep you alive — breathing, circulating blood, maintaining body temperature. It accounts for 60-75% of the calories you burn each day.
The Mifflin-St Jeor Formula
This calculator uses the most accurate modern formula:
Factors That Affect BMR
- Muscle mass — muscle burns more than fat, even at rest
- Age — BMR drops about 2% per decade after 20
- Sex — men typically have higher BMR due to more muscle
- Body size — larger bodies burn more calories
- Genetics — some people naturally burn more or less
BMR vs. TDEE
BMR is calories at complete rest. Your actual daily burn (TDEE) is BMR multiplied by an activity factor. Even light activity adds 20-40% on top of BMR. Use the Calorie Calculator if you want your full daily burn.
Frequently Asked Questions
Can I speed up my metabolism?
Building muscle is the only reliable way to raise BMR long-term — each pound of muscle burns about 6 calories/day at rest vs. 2 for fat. Extreme diets actually slow metabolism.
About the BMR Calculator
The BMR Calculator lets you figure out bmr calculatorinstantly, without reaching for a spreadsheet or doing the math by hand. Whether you're planning a budget, checking a loan, or working through homework, the tool applies the correct formula behind the scenes and shows the result the moment you enter your numbers.
Unlike a static chart or table, this calculator adapts to your exact inputs. You can adjust any value and see the outcome update in real time, which makes it easy to compare scenarios — for example, "what if the rate were 1% lower?" or "what if I paid an extra $50 a month?"
How to Use This Tool
- Enter the main values the calculator asks for (for example, amount, rate, and time).
- Pick the right unit or option where the tool offers a choice.
- Read the result, which appears instantly below the inputs.
- Adjust any field to test a different scenario — the answer updates without a reload.
- Copy or note the result. Nothing is stored, so close the tab when you're done.
Why Use an Online Calculator?
Browser-based tools like this one have a few real advantages over installed software or manual methods:
- No installation. It opens instantly in any browser, on any operating system.
- Private by default. Everything runs locally, so your data stays on your device.
- Always up to date.There's nothing to update — you always get the latest version when you load the page.
- Free and unlimited. Use it as often as you like, with no account and no caps.
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