BMI 31.5: What It Means and What to Do
A body mass index of 31.5 places you in the Obese Class I category according to WHO and CDC standards. The average BMI for US adults is 29.8 (men: 29.4, women: 30.1).
BMI Scale Position
Your BMI: 31.5 — Increased risk for multiple chronic conditions
BMI Category
Obese Class I
Healthy BMI Range
18.5–24.9
BMI to Lose to Reach Normal
6.6 BMI
Approx. Lbs to Lose (5ft9 ref)
~64 lbs
Weight Loss Timeline to Reach Normal BMI (5'9" reference)
A BMI of 31.5 at 5'9" corresponds to approximately 213 lbs. Reaching the midpoint of the normal range (BMI 22) at this height requires losing roughly 64 lbs.
−500 cal/day
65 weeks
14.9 months
0.99 lbs/week
−750 cal/day
43 weeks
9.9 months
1.49 lbs/week
FDA recommendation: 1–2 lbs/week. Deficits over 1,000 cal/day require medical supervision. Actual height and weight vary; use the BMI Calculator for your exact numbers.