Calculate your Body Mass Index and see your healthy weight range using metric or imperial units.
Formula: BMI = weight (kg) ÷ (height (m))². For imperial units: BMI = 703 × weight (lb) ÷ (height (in))².
Example: 70 kg, 1.75 m → BMI = 70 ÷ (1.75²) = 22.86
BMI, or Body Mass Index, is a simple screening test that uses your height and weight to place you into a category: underweight, normal, overweight, or one of three obesity classes. It does not directly measure body fat, so it can misclassify muscular people and may underestimate risk in older adults. Despite its limits, BMI remains the standard first step because it is fast, free, and supported by decades of population data — and is also known as the body mass index test in clinical settings.
Body Mass Index (BMI) is a simple, widely-used screening tool that estimates body fat based on your height and weight. Developed in the 1830s by Belgian mathematician Adolphe Quetelet, BMI provides a quick way to categorize weight status and assess potential health risks.
This range is associated with the lowest risk of weight-related health problems. Maintaining a healthy BMI supports cardiovascular health, reduces diabetes risk, and promotes overall well-being.
This range indicates increased risk for conditions like high blood pressure, type 2 diabetes, and certain cancers. Modest weight loss (5-10%) can significantly improve health outcomes.
Obesity significantly increases risk for serious health conditions including heart disease, stroke, type 2 diabetes, and sleep apnea. Medical consultation is recommended for comprehensive management.
Being underweight can lead to nutritional deficiencies, weakened immune function, and osteoporosis. Focus on nutrient-dense foods and consult healthcare providers if unintentional weight loss occurs.
While BMI is useful for population-level assessments, it has significant individual limitations:
Professional Guidance: BMI is a screening tool, not a diagnostic instrument. Always consult with healthcare professionals for personalized health assessments and recommendations. Your overall health depends on many factors beyond BMI, including diet quality, physical activity, sleep, stress management, and genetic predispositions.
Type your weight (in kg or lbs) and height (in cm or inches). The calculator auto-converts to metric for the BMI formula.
BMI = weight in kg divided by height in meters squared. A 70 kg person who is 1.75 m tall has a BMI of 22.9.
Below 18.5 is underweight, 18.5-24.9 is normal, 25-29.9 is overweight, 30+ is obese. The calculator also shows the healthy BMI range for your height.
For related calculations, try our body fat calculator.
Cross-checked against authoritative formulas (IRS, NIST, ACM) and updated for 2025/2026 tax years and rates.
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Estimates only. Calculator results are for educational and planning purposes — not professional advice. For binding decisions on taxes, investments, health, or legal matters, consult a qualified professional.
FAQ
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A BMI calculator for guys is a tool that computes body mass index using male-specific reference ranges and thresholds. Our BMI calculator for guys uses the standard formula (weight in kg divided by height in meters squared) and the WHO adult male cutoffs. The BMI calculator for guys is more accurate than a generic BMI tool because it accounts for the typical male muscle-to-fat ratio.
How it works
Our bmi calculator for guys lets you calculate your BMI in metric or imperial units and see which health category you fall into in four steps.
Toggle the tab that matches how you measure your height and weight. Use metric for centimeters and kilograms, imperial for feet/inches and pounds.
Type your height in the matching field. In metric mode, use centimeters. In imperial mode, enter feet and inches separately.
Type your current weight in the matching field. Use kilograms in metric mode, pounds in imperial mode.
The calculator instantly displays your BMI number and the matching health category, plus a short description and recommendations for that range.
Learn how BMI works, its limitations, and how to use it effectively for wellness assessment and health monitoring.
Understand the differences between BMI and body fat percentage, when to use each, and how to track your health.
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