What is BMI and how is it calculated?

BMI (Body Mass Index) is a measure of body fat based on height and weight. Formula: weight (kg) / height (m)². It helps screen for weight categories.

What is a healthy BMI range?

For most adults, a BMI between 18.5 and 24.9 is considered healthy. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.

BMI is a useful screening tool but does not measure body fat directly. Athletes may have high BMI due to muscle mass. Consider combining with body fat percentage.

What is TDEE and why does it matter?

TDEE (Total Daily Energy Expenditure) estimates calories you burn per day. It helps set calorie goals for weight loss, maintenance, or gain.

BMI & TDEE Calculator | Free Body Mass Index & Healthy Weight Range Tool

BMI & Healthy Weight Range

Metric (cm/kg)

Imperial (ft/in, lbs)

Height (cm)

Weight (kg)

22.9

Normal weight

Under <18.5Normal 18.5–24.9Over 25–29.9Obese ≥30

Normal (18.5–24.9) 60.7–81.7 kg

Underweight <60.7 kg

Overweight 81.7–97.8 kg

Obese ≥97.8 kg

Daily Calorie Needs (TDEE)

Gender

Age

Activity level

2,345

calories/day

Weight loss (cut) 1,876 kcal

Weight gain (bulk) 2,814 kcal

Mifflin-St Jeor formula. Adjust by ±20% for goals.

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Frequently Asked Questions

What is a healthy BMI?

A BMI between 18.5 and 24.9 is considered healthy for most adults. However, individual factors like muscle mass may affect interpretation.

How accurate is BMI for athletes?

BMI may overestimate body fat in athletes due to higher muscle mass. Consider using body fat percentage for a more accurate assessment.

What is TDEE and why is it useful?

TDEE (Total Daily Energy Expenditure) estimates total calories burned per day. It helps set calorie targets for weight maintenance, loss, or gain.