BRI + BMI Calculator — Body Roundness Index

About

BRI + BMI Calculator is the only Chrome extension that calculates Body Roundness Index (BRI) — the modern, science-backed metric that predicts visceral fat and cardiometabolic risk better than BMI alone.

  WHY BRI MATTERS
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BMI only uses height and weight. BRI adds waist circumference, which means it captures fat distribution around your organs — the kind that drives heart disease, diabetes, and metabolic syndrome. BRI is the measurement doctors are increasingly paying attention to.

  WHAT YOU GET
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  ► Instant BRI + BMI calculation from the toolbar — no website visit needed
  ► Metric (cm / kg) and Imperial (in / lbs) support
  ► Color-coded 6-zone BRI gauge: Extremely Lean · Lean · Normal · Above Average · High · Very High
  ► Color-coded 4-zone BMI gauge: Underweight · Normal · Overweight · Obese
  ► "Understand your scores" link to the full BRI range guide
  ► How to measure your waist correctly — built right into the form

  HISTORY & PROGRESS TRACKING
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  ► Save measurements with one tap
  ► View your last 20 entries with color-coded BRI dots
  ► BRI trend chart — see if your score is improving
  ► Delete any entry instantly

  STATISTICS DASHBOARD
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  ► Average BRI over 7 days, 30 days, and all time
  ► BRI change over 30 days (green = improving, red = worsening)
  ► Dual BRI + BMI trend chart
  ► Your current BRI position on the full health gauge

  DESIGN
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  ► Modern, clean interface — no clutter
  ► Light and dark mode (persists across sessions)
  ► 380 px popup — compact but readable
  ► All data stored locally on your device — nothing sent to any server

  PRIVACY FIRST
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  ► Zero tracking, zero analytics, zero ads in the extension
  ► The only permission used is chrome.storage.local — to save your measurements on your device
  ► No account, no login, no email required

  BACKED BY SCIENCE
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BRI (Body Roundness Index) was developed by Dr. Diana Thomas and colleagues and published in peer-reviewed journals. It has been validated across multiple large cohort studies as a stronger predictor of visceral adiposity and metabolic risk than BMI.

Full calculator, blog, and scientific references at bri-bmi-calculator.com