BMR Calculator

Calculate your Basal Metabolic Rate (BMR) using Mifflin-St Jeor and Harris-Benedict equations.

BMR Calculator Options
Result Details
Enter parameters and click Calculate to view.
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Diet & Fitness Tool

BMR Calculator

Estimate your baseline energy needs at complete rest.

100% Free & Local
STEP 01

Input Demographics

Enter your current age in years and select your biological gender.

STEP 02

Height & Weight

Input your height in centimeters and weight in kilograms to establish body volume ratios.

STEP 03

Select Equation

The calculator processes measurements in parallel across Mifflin-St Jeor and Harris-Benedict systems.

STEP 04

Get Calorie Goals

Click Calculate to output the resting metabolic rate calories required to maintain baseline cell processes.

Your Privacy Matters

All calculations run locally in your browser.

No Server Uploads

No variables or results are sent to our servers.

Auto-Cleared

Your session data is erased upon closing the tab.


Capabilities

Key Capabilities

Complete Features

Dual Metric Equations

Compares standard Mifflin-St Jeor and Harris-Benedict formulas to cross-reference BMR metabolic limits.

Accurate Resting Baselines

Determines daily resting calorie needs excluding variables like work or exercise.

Standard Unit System

Converts measurements between standard and metric systems seamlessly.

Active Multiplier Ready

Supplies the core BMR integer required to compute your Total Daily Energy Expenditure (TDEE).

Private Fitness Stats

Your height, weight, and fitness parameters process securely inside your local browser.


Help

Common Questions Answered

Support
Q1 What is Basal Metabolic Rate (BMR)?
BMR is the minimum number of calories your body needs to perform basic, life-sustaining functions (like breathing, cell production, and body temperature maintenance) at rest.
Q2 Which BMR formula is the most accurate?
The Mifflin-St Jeor equation is currently considered the most accurate predictor of metabolic rate for modern populations by the Academy of Nutrition and Dietetics.
Q3 Can I lose weight just by eating below my BMR?
BMR is your baseline for survival. Eating below your BMR for extended periods is generally not recommended without medical supervision. For weight loss, calculate your TDEE and create a moderate deficit.
Q4 Does muscle mass affect my BMR?
Yes. Muscle tissue is more metabolically active than fat tissue. Increasing lean muscle mass elevates your resting metabolic rate, raising your BMR.
Q5 Why do BMR requirements decrease with age?
Metabolism slows down with age due to a natural loss of lean muscle mass and changes in hormonal regulation.