CalVerse.co — BMI Calculator
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🏃 Health & Body Metrics
BMI Calculator
Calculate your Body Mass Index. Get your category, healthy weight range, waist risk, body fat estimate, and a personalised goal timeline.
Imperial & Metric
Waist Risk
Goal Timeline
Action Plan
📐 Enter Your Measurements
Metric (kg / cm)
Imperial (lbs / ft·in)
kg
cm
For Detailed Analysis + Waist Risk
yrs
cm
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BMI Scale (15 – 45)
UnderweightNormalOverweightObese
Healthy Range
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BMI 18.5 – 24.9
To Healthy Weight
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lose / gain
Ideal Body Weight
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Devine formula
Body Fat Est.
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Deurenberg formula
📏 Waist Circumference Risk
Waist size predicts visceral fat and metabolic risk more accurately than BMI alone. Enter your waist measurement above to unlock this section.
← Enter waist circumference in the input card above
Low RiskElevatedHigh Risk
Waist Size
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your measurement
Waist-to-Height
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target: < 0.50
Visceral Risk
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WHO threshold
⏱️ Timeline to Healthy Weight
Based on a sustained caloric deficit — no crash dieting.
Your Personalised Action Plan
3 steps based on your current BMI
1
Calculate and hit your loading...
Enter your measurements above for a personalised plan.
WHO BMI Categories
| Category | BMI Range | Health Risk |
|---|
⚠️ What BMI Doesn't Tell You
BMI is a population screening tool. These 6 factors mean two people with the same BMI can have very different health profiles.
Muscle Mass
Muscle weighs more than fat. A 200 lb athlete at 5'10" is BMI 28.7 (overweight) but may have only 10% body fat.
Fat Distribution
Visceral fat (around organs) is far more dangerous than subcutaneous fat. Two people with BMI 28 can have completely different cardiac risk.
Ethnicity
Asian populations face higher metabolic risk at lower BMI thresholds. WHO recommends using BMI 23 as overweight and 27.5 as obese for Asian adults.
Age
Older adults naturally lose muscle and gain fat. A BMI of 26 may reflect healthy body composition at 60 but excess fat at 25.
Bone Density
Heavy bone structure raises BMI without any extra fat. Conversely, osteoporosis can mask low BMI severity in older women.
Better Alternatives
Waist-to-height ratio (<0.5), waist circumference, body fat % via DEXA, and metabolic blood panels give a more complete picture.
⚕️ Important: BMI is a population-level screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, ethnicity, or fat distribution. Always consult a healthcare provider for a comprehensive health assessment.
Frequently Asked Questions
What is a healthy BMI for adults?+
According to the WHO, a healthy BMI for most adults is 18.5–24.9. Below 18.5 is underweight; 25–29.9 is overweight; 30 and above is obese. These are population-level guidelines — individual health depends on body composition, fitness level, blood markers, and metabolic health.
Is BMI accurate for athletes and muscular people?+
No — BMI significantly overestimates body fat in muscular individuals. A 200-pound athlete at 5'10" has BMI 28.7 but may have only 10–12% body fat. For athletes, body composition testing via DEXA scan, hydrostatic weighing, or bioelectrical impedance gives a far more accurate picture.
How can I lower my BMI?+
BMI decreases when you lose body fat, requiring a sustained caloric deficit. A deficit of 500 cal/day yields ~0.5 kg/week fat loss. Combining a reduced-calorie diet with resistance training is optimal — it preserves lean muscle while reducing fat mass. Use the Calorie Calculator to find your TDEE and set a target.
What is the BMI formula?+
Metric: BMI = weight (kg) ÷ height² (m²). Example: 75 kg at 175 cm = 75 ÷ (1.75²) = 24.5. Imperial: BMI = (weight in lbs × 703) ÷ height² (inches²). Example: 165 lbs at 5'9" (69 in) = (165 × 703) ÷ 69² = 24.4.
What is waist-to-height ratio and why does it matter?+
Waist-to-height ratio (WHtR) = waist circumference ÷ height. A WHtR below 0.50 is considered healthy for most adults and is a stronger predictor of cardiovascular and metabolic disease than BMI. The rule of thumb: "keep your waist to less than half your height." It accounts for body fat distribution in a way BMI cannot.
What are better metrics than BMI?+
Several metrics give more detail: (1) Waist circumference — risk increases above 88 cm/35 in (women) or 102 cm/40 in (men). (2) Waist-to-height ratio — keep below 0.5. (3) Body fat % via DEXA, hydrostatic weighing, or calipers. (4) Waist-to-hip ratio — WHO risk: above 0.90 (men) or 0.85 (women). Using 2–3 metrics together gives a far better picture.
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