Free BMI Calculator
Calculate your Body Mass Index (BMI) to assess if your weight is healthy for your height.
lbs
ft
in
BMI
24.4
BMI vs Weight
How BMI Is Calculated
Formula (Imperial)
BMI = (Weight in lbs x 703) / (Height in inches)^2
BMI Categories
Example Calculation
A person weighing 170 lbs at 5 feet 10 inches.
- 01Height in inches = 5 x 12 + 10 = 70 inches
- 02BMI = (170 x 703) / (70 x 70)
- 03= 119,510 / 4,900
- 04= 24.4 (Normal weight)
Example Calculations
What is the BMI for a 6-foot male weighing 180 lbs?
BMI = 24.4 (Normal weight)
- 1.Height: 6'0" = 72 inches
- 2.Weight: 180 lbs
- 3.BMI = 703 × weight / height² = 703 × 180 / 72²
- 4.BMI = 126,540 / 5,184 = 24.4
- 5.Category: Normal weight (18.5–24.9)
What is the BMI for a 5'5" female weighing 140 lbs?
BMI = 23.3 (Normal weight)
- 1.Height: 5'5" = 65 inches
- 2.Weight: 140 lbs
- 3.BMI = 703 × 140 / 65² = 98,420 / 4,225
- 4.BMI = 23.3
- 5.Category: Normal weight (18.5–24.9)
What is the BMI for someone who is 5'10" and 200 lbs?
BMI = 28.7 (Overweight)
- 1.Height: 5'10" = 70 inches
- 2.Weight: 200 lbs
- 3.BMI = 703 × 200 / 70² = 140,600 / 4,900
- 4.BMI = 28.7
- 5.Category: Overweight (25.0–29.9)
What is a healthy weight for 5'8"?
125–163 lbs
- 1.Height: 5'8" = 68 inches
- 2.Healthy BMI range: 18.5–24.9
- 3.Minimum weight: 18.5 × 68² / 703 = 121.7 ≈ 122 lbs
- 4.Maximum weight: 24.9 × 68² / 703 = 163.8 ≈ 164 lbs
- 5.Healthy weight range: approximately 122–164 lbs
What BMI is considered obese?
BMI of 30 or higher
- 1.Underweight: BMI below 18.5
- 2.Normal weight: BMI 18.5–24.9
- 3.Overweight: BMI 25.0–29.9
- 4.Obese: BMI 30.0 or higher
- 5.Severely obese: BMI 40.0 or higher
Frequently Asked Questions
Learn More
Understanding BMI: What It Means and How to Calculate It
Learn what BMI is, how to calculate it, what the ranges mean, and the limitations of body mass index as a health metric. Comprehensive guide with formulas and context.