Body Surface Area (BSA) Calculator
Calculate your Body Surface Area (BSA) using the Du Bois formula—one of the most widely used formulas in clinical practice. BSA is a key metric used in medicine for drug dosing, chemotherapy, and assessing metabolic rate. Get your personalized BSA estimate in seconds.
How to Use This Tool
1. Enter Weight
kg or lbs
2. Enter Height
cm or inches
3. Get Results
View BSA & category
Formula & Calculation
Results in square meters (m²)
Results are rounded to 2 decimal places for clarity.
Quick Reference BSA Table
| Weight (kg) | Height (cm) | BSA (m²) | Category |
|---|---|---|---|
| 50 | 155 | 1.49 | Below Average |
| 60 | 165 | 1.66 | Below Average |
| 70 | 175 | 1.84 | Average |
| 80 | 180 | 1.99 | Average |
| 90 | 185 | 2.13 | Above Average |
| 100 | 190 | 2.27 | Above Average |
How We Calculated
- Input: We collected your weight and height.
- Conversion: Weight is converted to kg, height to cm.
- Formula: Applied the Du Bois formula: BSA = 0.007184 × Weight^0.425 × Height^0.725.
- Category: Compared your BSA to standard ranges to determine the category.
Why Trust This Tool?
Clinically validated standard
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Accuracy & Standards
This calculator uses the Du Bois formula, which is one of the most widely used and validated formulas for estimating Body Surface Area in clinical practice. Results are rounded to 2 decimal places. The tool is for educational purposes—not a substitute for professional medical advice.
Unit Relationship
1 kg = 2.20462 lbs
1 in = 2.54 cm
1 m² = 10.764 ft²
Learn About Body Surface Area
What is BSA?
Body Surface Area (BSA) is a measure of the total surface area of the human body. It's used in medical settings for drug dosing, chemotherapy, and various clinical assessments.
Why BSA Matters
BSA is essential for calculating medication dosages, especially for chemotherapy and other treatments where precise dosing is critical. It's also used in assessing metabolic rate and cardiovascular function.
BSA vs BMI
BMI measures body fat based on weight and height, while BSA measures total body surface area. Both are used in medical contexts, but BSA is more relevant for drug dosing and metabolic assessments.
Real-World Examples
- Example 1: 70 kg, 175 cm → BSA: 1.84 m² (Average)
- Example 2: 60 kg, 165 cm → BSA: 1.66 m² (Below Average)
- Example 3: 90 kg, 185 cm → BSA: 2.13 m² (Above Average)
Limitations of This Tool
- Provides estimates—individual BSA may vary.
- Does not account for age, gender, or body composition differences.
- Not suitable for children or individuals with extreme body proportions.
- Always consult a healthcare professional for clinical decision-making.
Trust & Privacy
We take your privacy seriously. This tool:
- Does not store data on any server
- All calculations happen locally in your browser
- No cookies are used for this tool
References
- Du Bois D, Du Bois EF. A formula to estimate the approximate surface area if height and weight be known. Arch Intern Med. 1916.
- Mosteller RD. Simplified calculation of body-surface area. N Engl J Med. 1987.
- National Institutes of Health. Body Surface Area. NIH.gov.
Editorial Process
The Healthtus editorial team, consisting of healthcare professionals and medical writers, reviews this tool regularly to ensure accuracy and alignment with the latest medical standards. We update the content and references as new research emerges.
Last reviewed: July 2026