Mosteller BSA Calculator (Square Root Method)
BSA is an estimated body-surface-area value calculated from height and weight. Some medical research protocols use BSA as one input, but this calculator does not provide medication doses or treatment recommendations.
Mosteller BSA Calculator (Square Root Method)
Mosteller BSA Calculator (Square Root Method)
Calculation Results Summary
Enter your details to view your calculated result.
Choose a calculator, enter your details, and calculate your result.
Calculation Results Summary
--
--
Body Surface Area Reference
Body Surface Area Calculator — Mosteller & Du Bois Reference Equations
BSA is an estimated body-surface-area value calculated from height and weight. Some medical research protocols use BSA as one input, but this calculator does not provide medication doses or treatment recommendations.
Mosteller & Du Bois BSA Equations
BSA (m²) = √ [ (Height cm × Weight kg) / 3600 ]Mosteller BSA (m²) = √ [ Height (cm) × Weight (kg) / 3600 ] | Du Bois BSA (m²) = 0.007184 × Height (cm)^0.725 × Weight (kg)^0.425
Body Surface Area (m²) Adult & Population Reference Ranges
Infant population reference range
Child population reference range
Standard adult female population average
Standard adult male population average
| Category / Level | Reference Range / Metric | Reference Context |
|---|---|---|
| Infants (0–12 months) | 0.25 m² – 0.35 m² | Infant population reference range |
| Children (1–12 years) | 0.50 m² – 1.07 m² | Child population reference range |
| Adult Women Average | 1.60 m² | Standard adult female population average |
| Adult Men Average | 1.90 m² | Standard adult male population average |
Frequently Asked Questions
What is Body Surface Area (BSA)?
BSA is an estimated body-surface-area value calculated from height and weight. Some medical research protocols use BSA as one input, but this calculator does not provide medication doses or treatment recommendations.
How is BSA calculated using the Mosteller equation?
The Mosteller equation multiplies height in cm by weight in kg, divides by 3600, and takes the square root: BSA = √ (Height × Weight / 3600).
What is the average body surface area for adults?
The average estimated body surface area is approximately 1.60 m² for adult women and 1.90 m² for adult men.
Embed Free Real BMI Calculator On Your Website
Add a free, responsive BMI calculator to your blog, WordPress site, or website with a simple HTML embed code. No API key required.
<iframe src="https://realbmicalculator.com/embed/bmi-calculator" width="100%" height="560" frameborder="0" loading="lazy" style="border:none; border-radius:16px; box-shadow:0 10px 30px rgba(0,0,0,0.15);"></iframe>
<div style="font-size:12px; font-family:sans-serif; text-align:center; margin-top:8px; color:#888;">
Powered by <a href="https://realbmicalculator.com" target="_blank" rel="noopener" style="color:#E8674A; font-weight:600; text-decoration:none;">Real BMI Calculator</a>
</div>Articles & Health Library
Latest Health Articles & Guides
Evidence-based health guides, standard BMI reference ranges, and weight loss calculation formulas.
BMI Calculator India (2026 Guide): Revised WHO Ranges, Formula & Chart
Complete 2026 guide on BMI for Indians. Learn about BMI 23 and Asian-population reference thresholds, WHO South-East Asia cut-offs, healthy weight ranges, formulas, and FAQs.
What is BMI? Body Mass Index Definition, Calculation & Health Meaning
Comprehensive 2026 guide to Body Mass Index (BMI). Understand what BMI is, how it is calculated, WHO scale ranges, and what your score means.
Is BMI Accurate? Evidence, Limitations & the Oxford 2.5 Height-Adjusted Formula
Is BMI actually accurate for your body? Read 2026 published reference research on muscle density factors, Oxford height scaling formula, and WHO ethnic guidelines.
BMR vs. TDEE Calculator: Key Differences & Weight Loss Math
Understand the difference between BMR (Basal Metabolic Rate) and TDEE (Total Daily Energy Expenditure). Learn how to calculate daily deficit calories.
BMI Chart for Men and Women (Age-Based Reference Ranges 2026)
Detailed gender and age-adjusted BMI reference chart. Compare body fat distribution traits between male and female adults.
Understanding BMI 18.5–22.9 in Asian-Population Reference Guidance
In-depth analysis of WHO South-East Asia BMI reference guidelines. Understanding BMI 18.5–22.9 in Asian-Population Reference Guidance.
Body Mass Index (BMI) & Population Health Reference Guidance
How Do I Calculate My BMI & Related Metrics?
You can evaluate your Body Mass Index (weight / height²) alongside your Basal Metabolic Rate (BMR), Total Daily Energy Expenditure (TDEE), and Waist-to-Height Ratio (WHtR). This provides educational context that accounts for muscle density, age, and waist-to-height reference proportions.
How Does Standard BMI Work?
Standard BMI calculators use a mathematical formula recognized by WHO and CDC. Standard BMI measures total body mass relative to height. Real BMI presents BMI alongside complementary estimates and population-reference ranges for additional educational context.
How Do Multiple Metrics Provide Broader Context?
No single number paints a complete picture of an individual's body composition. Combining standard BMI with Waist-to-Height Ratio (WHtR) and WHO Asian cutoffs (23.0 kg/m² for overweight) provides additional context for body composition and abdominal fat reference indicators.
Is a BMI of 25 Realistic?
For muscular athletes, BMI may be higher because BMI does not distinguish muscle mass from fat mass.
Body Mass Index (BMI) & Population Health Guidelines
According to published literature from public health authorities (including the WHO and CDC), maintaining a Body Mass Index (BMI between 18.5 and 24.9 kg/m²) aligns with standard population reference baselines. Real BMI provides educational screening references aligned with these guidelines.
What is the Real BMI Platform and How Does it Work?
Real BMI is the name of this website and brand platform. Our suite presents standard Body Mass Index (BMI) calculations alongside complementary educational metrics — including Basal Metabolic Rate (BMR), Total Daily Energy Expenditure (TDEE), and Waist-to-Height Ratio — to provide broader context. Real BMI is our website entity, while Body Mass Index (BMI) is the underlying health reference metric.
Is BMI Accurate for Everyone? The Athlete & Muscle Paradox
While standard Body Mass Index formulas (weight/height²) apply universally, muscle density differs significantly from adipose tissue. Muscular athletes or weightlifters may register higher BMI values despite having low body fat percentage, because dense muscle weighs more than fat volume. Waist-to-height ratio can provide additional context alongside BMI, particularly when BMI may not reflect body composition.
Why WHO Recommends Lower BMI Cutoffs for Asian & South Asian Populations
World Health Organization (WHO) published consensus recommends lower BMI cutoff thresholds for Asian and South Asian populations: 23.0 kg/m² for overweight reference (vs. 25.0 kg/m² standard) due to higher relative body fat at lower body mass indexes.
BMI Calculation Formula: Metric (kg/m²) vs. Imperial (lbs/in²)
Our online Real BMI Calculator supports both metric and imperial measurements. In metric, the formula is: BMI = weight (kg) / [height (m)]². In imperial units, the formula is: BMI = [weight (lb) / height (in)²] x 703.
Using BMI for Weight-Management Planning
Estimated calorie needs can be used as one planning reference. Individual weight-management strategies vary, and modest energy adjustments alongside balanced nutrition and physical activity are commonly explored.