BMI Calculator
Calculate your Body Mass Index (BMI) based on your height and weight to assess weight-related health categories.
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This BMI Calculator tool is provided strictly for educational and general wellness screening purposes. Results are statistical estimations calculated using standardized body composition and metabolic formulas. These figures do not account for individual medical histories, metabolic properties, clinical conditions, genetics, or therapeutic factors. For medical advice or diagnosis, consult a licensed healthcare provider.
Normal Weight Range
Personalized Actionable Insights
Your calculated BMI of 22.9 falls within the normal weight range (18.5– 24.9) per WHO screening guidelines. BMI is a population-level screening estimate and does not directly measure body composition, fitness, or health.
Maintain your healthy diet, ensuring a rich spectrum of whole foods, hydration, and fiber.
Aim for a hybrid physical routine combining aerobic fitness and muscle-strengthening sessions.
Monitor body composition trends (e.g., waist-to-hip ratio) alongside overall weight.
Mathematical Formula & Equations
Understand the logic under the hood. Here is the formula and exact variable mappings utilized by the BMI Calculator to compile results.
The Equation
BMI = weight (kg) / [height (m)]^2
Body Mass Index (BMI) is calculated by dividing body mass (weight) by the square of height. Height is converted from centimeters to meters in our formula.
Variable Definitions
Your total body weight measured in kilograms (kg).
Your total height measured in centimeters (cm) which is squared in meters.
Methodology & Computational Scope
Our BMI estimator uses the standard metric formula defined by Adolphe Quetelet. Ratios are compiled to categorize scores into four core clinical categories based on World Health Organization (WHO) international databases.
- Adolphe Quetelet Index of Relative Weight Development (Quetelet Index)
- World Health Organization (WHO) BMI Standard Weight Guidelines
- World Health Organization (WHO) Global Database on Body Mass Index
- National Institutes of Health (NIH) Clinical Guidelines on Overweight & Obesity
Step-by-Step Example Calculation
See the calculation in action. Below is a step-by-step mathematical example using default parameters to demonstrate how values are processed and generated.
Standard BMI Calculation Example
For an individual weighing 70 kg and standing 175 cm tall:
Convert height to meters: 175 cm / 100 = 1.75 m.
Square the height: 1.75 × 1.75 = 3.0625 m².
Divide weight by squared height: 70 ÷ 3.0625 = 22.86 (rounded to one decimal: 22.9).
Per World Health Organization screening guidelines, a BMI of 22.9 falls within the normal weight range (18.5–24.9). Note: BMI is a population-level screening estimate only and does not account for body composition, age, or muscle mass.
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Frequently Asked Questions
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BMI Calculator — Body Mass Index & Ideal Weight Range (Metric & Imperial)
Free interactive BMI Calculator. Check your Body Mass Index in kg/cm or lbs/inches with WHO and South Asian risk categories, plus ideal body weight ranges.
About This Calculator
Calculate your Body Mass Index (BMI) based on your height and weight to assess weight-related health categories.
Our BMI estimator uses the standard metric formula defined by Adolphe Quetelet. Ratios are compiled to categorize scores into four core clinical categories based on World Health Organization (WHO) international databases.
Accuracy & Editorial Standards
Reviewed by the NexProTools editorial team
NexProTools Editorial Board
Formula Sources
- Adolphe Quetelet Index of Relative Weight Development (Quetelet Index)
- World Health Organization (WHO) BMI Standard Weight Guidelines
Data Sources
- World Health Organization (WHO) Global Database on Body Mass Index
- National Institutes of Health (NIH) Clinical Guidelines on Overweight & Obesity
Last updated: June 2026. All results are estimates for informational purposes only and do not constitute professional advice.
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Calorie Calculator
Estimate your Total Daily Energy Expenditure (TDEE) and BMR. Find how many calories you need daily to maintain, lose, or gain weight.
Ideal Weight Calculator
Calculate your ideal body weight using four established medical formulas: Devine, Robinson, Miller, and Hamwi. Compare results for a comprehensive assessment.
Body Fat Calculator
Estimate your body fat percentage using the US Navy circumference method. Calculate fat mass and lean body mass based on simple body measurements.
Disclaimer: This BMI Calculator tool is provided strictly for educational and general wellness screening purposes. Results are statistical estimations calculated using standardized body composition and metabolic formulas. These figures do not account for individual medical histories, metabolic properties, clinical conditions, genetics, or therapeutic factors. For medical advice or diagnosis, consult a licensed healthcare provider. All calculations are performed entirely in your browser — no data is sent to our servers.