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Research Tool

BMI & GLP-1 Threshold Calculator

Calculate BMI, see your healthy-weight range, and check where you sit against the BMI thresholds used in modern GLP-1 obesity trials.

BMI & Body Composition Calculator

Calculate BMI, WHO category and the healthy-weight range for your height. Metric or imperial.

Your BMI
27.8
Overweight
Healthy weight range
56.7 – 76.3 kg
GLP-1 research note: BMI in the ≥27 range used in GLP-1 trials when a weight-related comorbidity is present.
WHO BMI categories
  • Underweight: < 18.5
  • Healthy weight: 18.5 – 24.9
  • Overweight: 25 – 29.9
  • Obese Class I: 30 – 34.9
  • Obese Class II: 35 – 39.9
  • Obese Class III: ≥ 40

Why BMI matters in GLP-1 research

Every landmark GLP-1 obesity trial has used BMI as an inclusion criterion. STEP-1 (semaglutide 2.4 mg) enrolled adults with BMI ≥30, or ≥27 with at least one weight-related comorbidity. SURMOUNT-1 (tirzepatide) used the same thresholds. The Phase 2 retatrutide trial (Jastreboff et al., 2023) enrolled adults with BMI ≥30, or 27–<30 with a comorbidity.

BMI is a screening number, not a diagnosis. It ignores body composition, ethnicity-specific risk (South Asian populations carry cardiometabolic risk at lower BMIs) and fat distribution. Waist circumference and waist-to-height ratio add useful signal — but for filtering into the current obesity trials, BMI is still the primary gate.

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