Showing results for Illinois (IL)
Calculators/Health & Fitness
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest. Uses both Mifflin-St Jeor and Harris-Benedict formulas.
lbs
ft
in
years
Formula Comparison
Mifflin-St Jeor (recommended)1737 cal/day
Harris-Benedict (1984)1804 cal/day
Average1771 cal/day
Basal Metabolic Rate
1737 cal/day
Harris-Benedict
1804 cal/day
How to Use This Calculator
1
What is BMR?
BMR is the number of calories your body needs to maintain basic life functions (breathing, circulation, cell repair) while completely at rest — as if you stayed in bed all day. It's the minimum caloric floor before accounting for any activity.
2
Enter your measurements
Use accurate weight and height measurements taken at the same time of day. Age affects BMR — it decreases roughly 2–3% per decade after age 20 as muscle mass naturally declines.
3
BMR vs TDEE
BMR alone won't tell you how much to eat. To find your real daily calorie needs, use the TDEE Calculator which multiplies your BMR by an activity level factor. Most people's TDEE is 1.4–1.8× their BMR.
Real-World Examples
30-Year-Old Male
Weight
180 lbs
Height
5'11"
Age
30
Gender
Male
Result1,890 cal/day BMR
Mifflin-St Jeor formula. His TDEE with moderate activity would be ~2,930 cal/day.
28-Year-Old Female
Weight
135 lbs
Height
5'5"
Age
28
Gender
Female
Result1,428 cal/day BMR
Mifflin-St Jeor formula. Her TDEE with light activity would be ~1,964 cal/day.
Frequently Asked Questions
Stay in the loop
Get notified when new calculators and features are added. No spam, ever.