BMR Calculator – Basal Metabolic Rate

Silver Zen BMR Calculator

Basal Metabolic Rate Calculator

Calculate Your Basal Metabolic Rate

Gender

Male Female

Age

years

Height

Weight

lbs

Calculation Formula

Mifflin-St Jeor

Most accurate

Harris-Benedict

Traditional

Your Basal Metabolic Rate

calories per day

Formula Comparison

Mifflin-St Jeor

Current standard (1990)

cal/day

Harris-Benedict

Original formula (1919)

cal/day

Total Daily Energy Expenditure

Sedentary

BMR × 1.2

Lightly Active

BMR × 1.375

Moderately Active

BMR × 1.55

Very Active

BMR × 1.725

Extra Active

BMR × 1.9

What Your BMR Means

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs at complete rest. It’s the energy required for basic functions like breathing, circulation, and cell production.

BMR Accounts For:

• 60-75% of daily calories

• Basic organ functions

• Brain activity

• Heart and lung function

Formula Comparison

Mifflin-St Jeor

Most accurate modern formula. Accounts for differences in body composition.

Harris-Benedict

Original formula from 1919. Revised in 1984 but still tends to overestimate.

Recommendation: Use Mifflin-St Jeor for most accurate results, especially for weight management.

Factors Affecting BMR

Age (BMR decreases with age)

Gender (men typically have higher BMR)

Body composition (muscle burns more calories)

Genetics and hormones

Environmental temperature

Important Note

BMR calculations are estimates. Individual metabolic rates can vary significantly. For personalized nutrition advice, consult a registered dietitian or healthcare provider.