What does the BMI calculator measure?
It compares weight and height to create a standardised body mass index score. The result helps you see whether you fall into underweight, healthy weight, overweight, or obesity categories so you know when to seek further evaluation. It is a proxy for body fatness but not a direct measure.
How reliable are BMI readings for muscular people?
Muscular individuals often show higher BMI scores because muscle is dense and weighs more than fat by volume. Use body-fat tests, circumference measurements, and professional guidance alongside BMI to determine whether the elevated value signals risk or just athletic build.
Can I track BMI trends over time with this tool?
Yes. Revisit the calculator weekly or monthly, update your weight, and switch units whenever needed. Consistent timing and accurate measurements will produce comparable results for long-term tracking. We recommend tracking it alongside your waist circumference.
Is BMI enough to assess my overall health?
BMI is a screening metric, not a diagnostic conclusion. It doesn't account for blood pressure, cholesterol, blood sugar, or family history. Pair it with lab tests, waist measurements, lifestyle review, and medical consultations to build a full picture of health.
Does the calculator store my personal information?
Inputs stay on your device so you can reset or clear them anytime. No personal data is transmitted to external servers, ensuring your health data remains private.
When should I consult a doctor about my BMI?
Schedule an appointment if BMI falls below 18.5, rises above 24.9 with additional risk factors (like high blood pressure), or changes rapidly without explanation. Professionals can investigate underlying causes and tailor a safe plan.
How often should adults recalculate BMI?
Most adults refresh their BMI every one to three months unless they are in a supervised program. Weekly logs help during rapid changes, but daily checks can highlight normal fluid shifts instead of meaningful progress.
Does the BMI calculator work for strength athletes?
Lean muscle can elevate BMI scores. Pair the calculator with body-fat testing, performance metrics, and professional assessments to avoid misreading an elevated category. If you can see your abs but your BMI says 'overweight', trust the mirror over the math.
Can I use this tool for children or teens?
Paediatric BMI relies on age- and sex-specific percentiles because children grow at different rates. This calculator is designed for adults with stable height—use official CDC or WHO growth charts or consult a paediatrician for minors.
What accuracy should I expect from home measurements?
Calibrated household scales and stadiometers are typically accurate within about 0.5 kg or 0.5 cm. Repeat measurements and place devices on a firm, level surface (not carpet) to minimise error.
How does hydration impact BMI results?
Short-term water retention can shift weight by one to two kilograms and temporarily nudge BMI. Measuring at consistent times—such as morning and fasted—reduces hydration noise.
Is my data stored when I close the browser?
Inputs are stored locally in your browser's storage so you can revisit without retyping. Clear your browser cache or use a private window if you prefer not to retain readings.