Powerful Body Surface Area Calculator

(BSA)Body Surface Area Calculator – Accurate, Trusted, and Clinically Proven

(BSA)Body Surface Area Calculator

Related Body Measurement Calculators

⚙️What is a Body Surface Area Calculator?

A Body Surface Area Calculator is a digital tool (usually on health websites like Healthmole) that helps you instantly calculate your BSA by inputting your:

Height (in cm)
Weight (in kg)

It uses scientific formulas like:

Du Bois Formula
Mosteller Formula (most commonly used)
Haycock, Boyd, or Gehan & George formulas

📲 You just enter your values and the calculator gives you your BSA in m² within a second.

What is BSA Body Surface Area?

Body Surface Area (BSA) is measured in square meters (m²) and it is actually called as total external body surface. Unlike body weight or height alone, BSA gives an accurate body size estimate — and it is especially helpful in medical contexts like:

Calculating medication doses (especially in chemotherapy)
Estimating fluid needs (in dehydration or burn treatment)
Assessing metabolic function
Evaluating organ size match (e.g., in transplants)
Adjusting drug dosing in children or obese patients

For example:
A 71 kg person who is 170 cm tall will have a BSA of around 1.83 m², and most drug doses are then calculated per square meter.

🏥 Why is the BSA Calculator Important?

Doctors, nurses, and pharmacists uses your Body Surface area value to:

Determine how much medicine you should take in a particular time intervals (e.g., “120 mg/m²” dosage)
Estimate how many fluids to give you in emergency situations.
Understand your body’s energy or metabolic needs
Adjust care in ICU, pediatrics, or cancer treatment

Key Uses of BSA:

Application	Why BSA Matters
Chemotherapy	Accurate dose to avoid toxicity or under-dosing
Kidney Function (GFR)	GFR is normalized per 1.73 m² of BSA
IV Fluid Therapy	BSA helps estimate fluid needs in severe dehydration or burns
Pediatric Care	Children’s dosages are based on BSA rather than age or weight alone
Organ Transplants	BSA determines organ size matching

How is BSA Calculated? (Formulas Explained)

There are 5 ways of formulas that explain Body Surface Area

1. Du Bois and Du Bois Formula

BSA = 0.007184 × Height(cm)^0.725 × Weight(kg)^0.425

2. Mosteller Formula (Most popular in hospitals)

BSA = √((Height(cm) × Weight(kg)) / 3600)

3. Haycock Formula

BSA = 0.024265 × Height(cm)^0.3964 × Weight(kg)^0.5378

4. Gehan and George Formula

BSA = 0.0235 × Height(cm)^0.42246 × Weight(kg)^0.51456

5. Boyd Formula

BSA = 0.0003207 × Height(cm)^0.3 × Weight(grams)^(0.7285 – 0.0188 × log10(Weight in grams))

Which BSA Formula Should You Use?

Mosteller’s formula is the go-to formula for its simplicity and clinical accuracy.

Formula	Accuracy	Complexity	Best For
Mosteller	High	Low	Adults, general use
Du Bois	Moderate	Medium	Research, cancer
Haycock	High	Medium	Children, Pediatrics
Boyd	High	High	Obese/extreme cases
Gehan & George	Moderate	Medium	Pharmacokinetics

📊 BSA Chart (Height vs Weight)

Height (cm)	Weight (kg)	Approx BSA (m²)
150	45	1.36
160	60	1.64
170	70	1.83
180	80	2.01
190	90	2.18

Note: Based on Mosteller formula.

🧪How to Use (BSA) Body Surface Area Calculator for good Health

Enter your height in metric and imperal units as you wish.
Enter your weight in metric and imperal units as you wish.
Click “Calculate”.
Instantly view your BSA in m².
Use the value in medical calculators, dosage charts, or share it with your doctor.

⚕️ BSA in Real-Life Health Scenarios

Let’s see how BSA is used in the real world.

✴️ Chemotherapy Dosing

A 60 kg, 160 cm patient has BSA of 1.6 m².
If a chemo dose is 100 mg/m², they get:
100 mg × 1.6 = 160 mg total dose

✴️ Pediatric Antibiotic Dose

Child’s BSA = 0.9 m²
Drug dose = 30 mg/m²
Total = 0.9 × 30 = 27 mg

10 Most Frequently Asked Questions (FAQs) ❓

What is a normal BSA?

For adults, BSA ranges from 1.5 to 2.2 m² depending on height and weight.

How is BSA different from BMI?

BMI is a ratio of weight and height; BSA includes surface area, which is more accurate for dosing.

Which BSA formula is used in hospitals?

Mosteller formula is most commonly used in modern hospitals.

Can Body Surface Area be used for children?

Yes. Haycock and Gehan & George formulas are ideal for pediatric Body Surface Area calculations.

What is the unit of BSA?

square meters (m²).

Is BSA used in dialysis?

Yes. Dialysis dose (Kt/V) is often normalized to BSA.

Is there a mobile app for BSA calculation?

Yes. But Healthmole’s calculator is fast, online, and free.

Does obesity affect BSA?

Yes. BSA increases with body weight. Use Boyd formula for better accuracy.

Can BSA help in weight loss planning?

It’s not a weight loss metric, but BSA helps track nutritional needs more precisely.

Is your BSA constant?

No. It changes if your height or weight changes significantly.

Why to Prefer Healthmole’s Calculator ?

✅ It is 100% Free and Easy to Use
✅ The calculator toos are Based on up-to-date National medical guidelines
✅ Every mobile supports the tool
✅ No data stored or shared to anybody–your data is completely erased on reset button
✅ It supports both metric and imperial units to get your output

🧑‍⚕️ Medical Disclaimer

This tool is made for educational and informational purposes only. Always please consult a licensed healthcare professional for medical advice.

Final Thoughts 🧭

Body Surface Area is a powerful and essential calculation in modern healthcare habits. Whether you’re a doctor, caregiver to someone, athlete, or patient, using a BSA Body Surface Area calculator gives you a significant advantage in managing your health intelligently.

Healthmole’s BSA Calculator is made with a combination of accuracy, simplicity, and real-world application to empower your health journey.

So what are you waiting for?

🔗 Bookmark Healthmole Media page.
📲 Use the calculator.
📧 Share your BSA with your doctor.
🎯 Make better health decisions today!