Calculadora de IMC
Verificar IMC e ver onde você está na escala de saúde
Esta calculadora fornece estimativas apenas para fins informativos. Não é aconselhamento médico. Consulte um profissional de saúde antes de tomar decisões de saúde.
Within the healthy weight range
Generally associated with lower risk of weight-related health conditions. Optimal range for most individuals.
Maintain current healthy habits with regular physical activity and balanced nutrition.
Fontes e metodologia
BMI = weight(kg) / height(m)²Body Mass Index formula
BMI categories: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (30+)
How to Use the BMI Calculator
What is BMI?
Body Mass Index (BMI) is a simple calculation using your height and weight to estimate body fat. Developed by Belgian mathematician Adolphe Quetelet in the 1830s, BMI has become the most widely used screening tool for categorizing weight status in adults. It provides a quick, cost-free way to identify potential weight-related health risks.
The BMI Formula
BMI is calculated using the formula:
BMI = Weight (kg) ÷ Height² (m²)
Or in imperial units:
BMI = (Weight (lbs) × 703) ÷ Height² (inches²)
For example, a person who is 5'9" (69 inches) and weighs 165 lbs has a BMI of: (165 × 703) ÷ (69²) = 24.4
BMI Categories Explained
The World Health Organization defines these BMI categories for adults:
- Severe Underweight: BMI below 16.0 – High risk of malnutrition
- Underweight: BMI 16.0 to 18.4 – May indicate nutritional deficiencies
- Normal Weight: BMI 18.5 to 24.9 – Optimal range for most adults
- Overweight: BMI 25.0 to 29.9 – Increased health risks
- Obese Class I: BMI 30.0 to 34.9 – Moderate obesity
- Obese Class II: BMI 35.0 to 39.9 – Severe obesity
- Obese Class III: BMI 40.0 and above – Very severe (morbid) obesity
Real-World Examples
- 5'4" (163 cm), 130 lbs (59 kg): BMI = 22.3 (Normal)
- 5'9" (175 cm), 165 lbs (75 kg): BMI = 24.4 (Normal)
- 6'0" (183 cm), 200 lbs (91 kg): BMI = 27.1 (Overweight)
- 5'6" (168 cm), 180 lbs (82 kg): BMI = 29.1 (Overweight)
- 5'10" (178 cm), 220 lbs (100 kg): BMI = 31.6 (Obese Class I)
Health Risks by BMI Category
Research shows that both very low and high BMI are associated with increased health risks:
- Underweight: Weakened immune system, osteoporosis, fertility issues, anemia
- Normal: Lower risk of chronic diseases, optimal metabolic function
- Overweight/Obese: Type 2 diabetes, cardiovascular disease, hypertension, sleep apnea, certain cancers, joint problems
Limitations of BMI
While BMI is a useful screening tool, it has important limitations:
- Muscle vs. Fat: Athletes and muscular individuals may have high BMI despite low body fat
- Age: Elderly individuals may have normal BMI but high body fat due to muscle loss
- Gender: Women typically have more body fat than men at the same BMI
- Ethnicity: Health risks may occur at different BMI thresholds for different populations
- Fat Distribution: BMI doesn't account for where fat is stored (belly fat is more dangerous)
Beyond BMI: Complete Body Assessment
For a more complete picture of your health, combine BMI with these tools:
- Body Fat Calculator – Estimate your body fat percentage
- Calorie Calculator – Determine your daily energy needs
- Waist-to-Hip Ratio – Measures fat distribution (waist ÷ hip circumference)
- Waist Circumference – Men >40", women >35" indicates elevated risk
About Our Calculations
Our BMI calculator uses the standard World Health Organization formula. Results are calculated instantly as you type and are accurate to one decimal place. For adults 20 years and older, we use the standard adult BMI categories. Children and teens require age-specific BMI percentile charts not covered by this calculator. Always consult a healthcare provider for personalized medical advice.
Perguntas Frequentes
BMI = weight (kg) / height (m)^2, or for pounds/inches: BMI = (weight x 703) / height^2. For example, 150 lbs at 5'8" (68 inches): (150 x 703) / (68 x 68) = 22.8 BMI. Our calculator handles both imperial and metric units.
A BMI of 18.5-24.9 is considered normal weight. Under 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese. However, BMI does not account for muscle mass, age, or body composition, so it is just one health indicator.
BMI often overestimates body fat in muscular individuals since muscle weighs more than fat. A fit athlete with significant muscle mass may have an "overweight" BMI while having low body fat. Body fat percentage is more accurate for athletes.
Healthy weight ranges vary. For a 5'6" person: 115-154 lbs is normal BMI range. For 5'10": 129-174 lbs. These are guidelines - individual factors like muscle mass, bone density, and body composition matter. Consult healthcare providers.
Standard BMI uses the same formula regardless of age or gender. However, women typically have more body fat than men at the same BMI, and older adults may have more body fat than younger adults. Adjusted calculations exist for children.
Higher BMI correlates with increased risk of heart disease, type 2 diabetes, high blood pressure, sleep apnea, and certain cancers. Even modest weight loss (5-10% of body weight) can significantly reduce these risks.
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