Question 1

What is BMR (Basal Metabolic Rate)?

Accepted Answer

BMR is the number of calories your body needs to maintain basic physiological functions at complete rest, including breathing, circulation, cell production, and brain activity. It accounts for 60-75% of total daily calories burned for most adults.

Question 2

Which BMR formula is most accurate?

Accepted Answer

The Mifflin-St Jeor equation, updated for the WHO standards, is the most widely validated formula for healthy adults. It is more accurate than the older Harris-Benedict equation, especially for people with obesity.

Question 3

How is BMR different from TDEE?

Accepted Answer

BMR is calories burned at complete rest. TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor (1.2 to 1.9) to include daily movement, exercise, and digestion. Use our TDEE calculator to see your full daily burn.

Question 4

Why does BMR decrease with age?

Accepted Answer

BMR drops 2-5% per decade after age 30, mainly due to age-related muscle loss (sarcopenia). Since muscle burns more calories than fat, less muscle means lower BMR. Strength training preserves muscle and protects BMR.

Question 5

Is this BMR calculator free with no signup?

Accepted Answer

Yes. The BodyStd BMR calculator is 100% free, runs in your browser, and requires no account or personal information. Enter your age, sex, height, and weight to get instant results.

Question 6

How many calories should I eat based on BMR?

Accepted Answer

Never eat below your BMR without medical supervision. For weight loss, target 15-20% below your TDEE (not BMR). For maintenance, eat at your TDEE. For muscle gain, eat 10-15% above TDEE. Use our TDEE calculator to find these numbers.

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