BMR Calculator
Verified Calculation Engine
The online BMR Calculator helps you calculate instantly and solve problems related to Metabolism. This tool provides accurate results using standard formulas and step-by-step calculation; you can view the formula with example in the calculator where available. Whether you are a student, teacher, or professional, this calculator simplifies complex calculations and saves time. Enter the required values below and get instant results. Results are shown clearly, with optional step-by-step explanation where applicable. The tool is free to use and works in any modern browser—no download or installation required. Bookmark this page for quick access whenever you need reliable Health Fitness calculations.
Calculate Basal Metabolic Rate (BMR) using Mifflin-St Jeor Equation
BMR = 10 × weight + 6.25 × height - 5 × age + (5 for male, -161 for female)
Mifflin-St Jeor Equation for Basal Metabolic Rate
- Uses the Mifflin–St Jeor equation as implemented by this calculator.
- Body composition and medical conditions are not modeled.
- Result is an estimate of resting energy expenditure only.
Inputs
Results
Worked Examples
Example 1: Male BMR
Calculate BMR for 30-year-old male, 75 kg, 180 cm
- weightKg: 75
- heightCm: 180
- ageYears: 30
- gender: male
- bmr: 1743
Example 2: Female BMR
Calculate BMR for 25-year-old female, 60 kg, 165 cm
- weightKg: 60
- heightCm: 165
- ageYears: 25
- gender: female
- bmr: 1354
About this calculator
Overview
This BMR calculator estimates Basal Metabolic Rate with the Mifflin–St Jeor equations using weight, height, age, and sex.
When to use
Use it as a starting estimate of resting daily energy expenditure before applying activity multipliers (such as TDEE).
Inputs explained
- Weight (kg) [required]
- Height (cm) [required]
- Age (years) [required]
- Gender [required]
Formula / method
Mifflin–St Jeor: men BMR = 10W + 6.25H − 5A + 5; women BMR = 10W + 6.25H − 5A − 161 (W in kg, H in cm, A in years).
Worked example
Example: 70 kg, 175 cm, age 30, male → BMR = 10×70 + 6.25×175 − 5×30 + 5 = 1,667 kcal/day (estimate).
Interpreting results
BMR is an estimate of energy use at complete rest. Daily needs are higher once activity, digestion, and individual variation are included.
Assumptions
- Uses Mifflin–St Jeor coefficients as implemented by this calculator.
- Body composition and medical conditions are not modeled.
Limitations
- Equations are population estimates; individual metabolism varies.
- Not suitable as the sole basis for clinical nutrition plans.
Important note
Informational and educational only. Not medical advice, diagnosis, or a substitute for clinical care. Consult a qualified clinician for health decisions.
How to Use This Calculator
- Enter the required values in the input fields.
- Click the Calculate button.
- View the computed result instantly.
Formula Used
Mifflin–St Jeor: men BMR = 10W + 6.25H − 5A + 5; women BMR = 10W + 6.25H − 5A − 161 (W in kg, H in cm, A in years).
Example Calculation
Example: 70 kg, 175 cm, age 30, male → BMR = 10×70 + 6.25×175 − 5×30 + 5 = 1,667 kcal/day (estimate).
Frequently Asked Questions
What is BMR Calculator?
- This BMR calculator estimates Basal Metabolic Rate with the Mifflin–St Jeor equations using weight, height, age, and sex.
How does BMR Calculator work?
- Mifflin–St Jeor: men BMR = 10W + 6.25H − 5A + 5; women BMR = 10W + 6.25H − 5A − 161 (W in kg, H in cm, A in years).
Why use this Health Fitness calculator?
- Use it as a starting estimate of resting daily energy expenditure before applying activity multipliers (such as TDEE).