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Body Surface Area Calculator

Health & Body

Five BSA formulas with 1.73m² reference

Quick Answer

Body Surface Area Calculator: Five BSA formulas with 1.73m² reference. Body Surface Area Calculator uses standard health formulas to compute accurate results instantly.

Mosteller BSA

1.75 m²

5-formula average 1.76 m² · max spread 0.011 m²

Five formulas compared

Mosteller （Most used clinically） ←1.752 m²
Du Bois （1916）1.754 m²
Haycock （Pediatrics）1.754 m²
Gehan-George （Oncology）1.763 m²
Boyd （Wide range）1.762 m²

Mosteller steps

  1. 1BSA = √(h × w / 3600)
  2. 2= √(170 × 65 / 3600)
  3. 3= √(3.07)
  4. 4= 1.752 m²

BSA position

Infant
Child
Adult
Large build

Mosteller 1.75 m²

Reference ranges

Newborn0.2-0.3 m²
1 year old0.4-0.5 m²
10 years old1.0-1.2 m²
Adult female1.6-1.8 m²
Adult male1.8-2.0 m²
Obese adult>2.2 m²
BSA drives chemotherapy dosing (mg/m²), cardiac index (CO/BSA), and burn fluid resuscitation. Mosteller is preferred — it's simple, bedside-computable, and within 1-2% of the older Du Bois across normal builds. For neonates prefer Haycock; formulas diverge most at extreme body sizes.

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How to Use

  1. Enter body metrics: fill height, weight, age etc. as prompted by the Body Surface Area Calculator.
  2. Read value and grade: results appear instantly with an authority-based classification.
  3. Check reference tables: confirm your range and healthy targets against the tables on this page.
  4. Back-solve your goal: adjust inputs to see what it takes to reach a target.

Key Points

  • Body Surface Area Calculator is a free online health tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Five BSA formulas with 1.73m² reference.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Body Surface Area Calculator formula

Body Surface Area Calculator uses standard health formulas to compute accurate results instantly.

FAQ

How do I use the Body Surface Area Calculator?
Open the page and fill in the input fields — results update automatically. Five BSA formulas with 1.73m² reference.
Are the results accurate?
Results follow published international standards (WHO, ACE, IOM) and are for reference only.
Can this replace medical advice?
No. Always consult a qualified healthcare professional for health decisions.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on all devices.

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Source & Updates

Based on WHO, ACE, IOM and other published international standards. Last updated: 2025-07

Authoritative sources:

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Body Surface Area Calculator[EB/OL]. https://www.yijiansuan.com/en/c/health/bsa

Results provided by this tool are for reference only and do not constitute professional advice.