25 Best Free Online BSA Calculator Websites

Here is a list of the best free online BSA calculator websites. BSA stands for Body Surface Area. A BSA calculator can help you find the external surface area of a human body. BSA is very useful in medicine and physiology. It is a better indicator of the metabolism of a human compared to body weight. BSA is also used to determine the dose of medication. Many medications have doses defined by per square meter body surface area. By knowing your BSA, you can come up with the right amount of dose for yourself.

This post covers 25 websites with body surface area calculators. To calculate the BSA, you have to provide the weight and height. Almost all these calculators allow you to enter the weight and height as per imperial and metric unit systems. That means you can pick the correct unit and directly add your data without performing any conversions. Some of these calculators cover multiple BSA calculation approaches such as DuBios, Boyd Gehan-George, Haycock, Mosteller, etc.

My Favorite Online BSA Calculator

Halls.md is my favorite website on this list to calculate body surface area online. This website offers a multiple-purpose calculator that not only calculates the BSA but also determines the medical doses. The table below can give you some insight into each calculator. Then you can go through the post to explore these in detail.

You can check out our other lists of the best free online FFMI Calculator websites, online AB Test Calculator websites, and online Ape Index Calculator websites.

Overview Table:

Websites	Unit System	Gender Specific Calculation	BSA Formula(s)
Halls.md	Imperial/Metric	Yes	Multiple
OmniCalculator.com	Imperial/Metric	No	Multiple
MDCalc.com	Imperial/Metric	No	Single
Calculator.net	Imperial/Metric	Yes	Multiple
MDApp.co	Imperial/Metric	Yes	Multiple
MyEndoConsult.com	Metric	No	Multiple
ClinCalc.com	Imperial/Metric	Yes	Single
iCliniq.com	Imperial/Metric	No	Multiple
GigaCalculator.com	Imperial/Metric	No	Single
EBMCalc.com	Imperial/Metric	No	Single
ManuelsWeb.com	Imperial/Metric	No	Multiple
EasyCalculation.com	Imperial/Metric	No	Multiple
Calculators.tech	Imperial/Metric	No	Single
Calculator-Online.net	Imperial/Metric	Yes	Multiple
Medscape.com	Imperial/Metric	No	Single
MedicineWorld.org	Imperial/Metric	No	Single
CalcTool.org	Imperial/Metric	No	Multiple
MyTecBits.com	Imperial/Metric	No	Multiple
GlobalRPh.com	Imperial/Metric	No	Multiple
PediatricOnCall.com	Imperial/Metric	No	Single
MSDManuals.com	Imperial/Metric	No	Single
BCBST.com	Imperial/Metric	No	Single
EBMConsult.com	Imperial/Metric	No	Multiple
VetoncologyConsults.com	Imperial/Metric	No	Single
CancerTherapyAdvisor.com	Imperial/Metric	No	Single

Halls.md

Halls.md is a free website to calculate BSA online. This website offers a Body Surface Area Calculator for medication doses. This calculator has three steps. The first step calculates the BSA. It supports metric and imperial unit systems and takes weight and height as input. For BSA, it supports 5 formulas covering DuBios, Boyd Gehan-George, Haycock, and Mosteller. You can pick the formula of your choice and then get the body surface area. Moving to the second step which is a safety check. It factors in age and gender to recalculate and estimate the body description. Lastly, the third step is the medication dose calculator. In this step, you can enter the dose per meter square and the calculator gets you the dose as per your body surface area. From there, you can print the results if need.

Highlights:

• Input: Weight and Height (Age & Gender).
• Output: BSA (DuBios, Boyd Gehan-George, Haycock, and Mosteller), Body Description, and Medical Dose.
• Unit System: Imperial and Metric.

OmniCalculator.com

OmniCalculator.com has a free online BSA calculator. This calculator lets you easily find your body surface area (BSA). By default, the calculator opens in a simple mode where it gets you the BSA using the most common form, the Du Bois formula. It supports various measurement units covering imperial and metric unit systems. You can change the unit for each parameter individually as well. This calculator also has an “Advanced mode”. When you toggle to this mode, it covers many different BSA formulas covering Mosteller, Haycock, Gehan and George, Boyd, Fujimoto, Takahira, Shuter, etc. All you need to use these formulas is to enter your weight and height.

Highlights:

• Input: Weight and Height.
• Output: BSA, BSA (Fujimoto), BSA (Gehan & George), BSA (Haycock), and BSA (Mosteller).
• Unit System: Imperial and Metric.

MDCalc.com

MDCalc.com offers a free online calculator for Body Mass Index (BMI) and Body Surface Area (BSA). This calculator has three input sections for weight, height, and Target BMI. The Target BMI is optional. You can just add the weight and height and use the calculator to get the BSA. But if you do add target BMI, it tells you what your weight should be to achieve that BMI target. Along with that, it also advises about health as per the BMI. This tool supports both, imperial and metric, unit systems. You can independently change the unit of weight and height.

Highlights:

• Input: Weight and Height.
• Output: BSA and BMI.
• Unit System: Imperial and Metric.

Calculator.net

Calculator.net has a free online BSA calculator. This calculator supports both, imperial and metric, unit systems. It has a versatile input section where you can add input in either of the unit systems. You start off by selecting the gender. After that, you can pick pounds or kilograms for the weight and enter the value. Below that, it offers two input sections for the height; one in centimeters and one in feet. You can use any of those to provide your input to the calculator. The results get you the BSA based on the Du Bois formula. Along with that, it also shows the BSA for Mosteller, Haycock, Gehan & George, Boyd, Fujimoto, Takahira, and Schlich formulas.

Highlights:

• Input: Gender, Weight, and Height.
• Output: BSA (Du Bois), BSA (Mosteller), BSA (Haycock), BSA (Gehan & George), BSA (Boyd),
• BSA (Fujimoto), BSA (Takahira), and BSA (Schlich).
• Unit System: Imperial and Metric.

MDApp.co

MDApp.co is a free website to calculate body surface area online. This calculator determines the BSA based on gender, age, weight, and height. It uses 5 BSA formulas covering Boyd, DuBios, Gehan-George, Haycock, and Mosteller. You can select the measurement unit at the top and then add your input to the calculator. Along with that, you have to select the formula you want to use for BSA. Based on that, the calculator gets you the body surface area. It also calculates BMI, Lean Body Mass, Ideal Body Weight, and Body status based on the WHO BMI range.

Highlights:

• Input: Gender, Age, Weight, and Height.
• Output: BSA (Boyd, DuBios, Gehan-George, Haycock, and Mosteller), BMI, and Lean Body Mass.
• Unit System: Imperial and Metric.

MyEndoConsult.com

MyEndoConsult.com has a free online BSA calculator. This is a simple calculator to measure the total area of the skin of a human body. It uses the metric unit systems for the input and output parameters. To get the BSA, you have to provide the weight and height. After that when you run the calculations, it gets you the body surface area. It shows the BSA using DuBios, Gehan-George, Haycock, and Mosteller formulas. Apart from that, it also provides theoretical information on BSA and other related terminologies.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios, Boyd, Gehan-George, Haycock, and Mosteller).
• Unit System: Metric.

ClinCalc.com

ClinCalc.com is another free website with an online BSA calculator. This calculator gets you the body surface area based on gender, weight, and height. It supports metric and imperial unit systems. You get to select the unit of choice for weight and height. Then you can add your input values to perform the calculation. When you do that, this calculator gets you the BSA. Along with the BSA, it shows you the ideal body weight as per the inputs, lean body weight, and BMI as well.

Highlights:

• Input: Gender, Weight, and Height.
• Output: BSA, Lean Body Mass, and BMI.
• Unit System: Imperial and Metric.

iCliniq.com

iCliniq.com offers a free online body surface area calculator. This calculator gives the BSA for DuBios, Boyd Gehan-George, Haycock, and Mosteller formulas. It comes with a simple interface where you have to add the weight and height. Alongside the inputs, you get dropdown boxes to select the unit for each parameter. You can pick a unit from the imperial or metric unit system. After that when you perform the calculation, it shows BSA as per all five formulas.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios, Boyd, Gehan-George, Haycock, and Mosteller).
• Unit System: Imperial and Metric.

GigaCalculator.com

GigaCalculator.com is an online calculator website that has a BSA calculator. This body surface area calculator is simple and gets the BSA using single default formula. The calculator has input sections to add the weight and height of the person. Alongside that, you get options to choose the unit for each input. You can go with the imperial or metric system for each input independently. Then you can add the data and get the body surface area.

Highlights:

• Input: Weight and Height.
• Output: BSA.
• Unit System: Imperial and Metric.

EBMCalc.com

EBMCalc.com has a simple online BSA calculator. The calculator has a minimalistic interface with data inputs for weight and height. It supports the imperial unit system and metric unit system. Alongside the weight and height, you can pick the measurement unit of choice for each input. After that, you can provide the values and the BSA. This calculator gives only one BSA output based on the DuBois formula. Along with that, you get a button to print the results of the calculation.

 

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios).
• Unit System: Imperial and Metric.

ManuelsWeb.com

ManuelsWeb.com offers a free online body surface area calculator. This calculator helps you determine your body surface area in square meters. It supports five BSA formulas covering DuBios, Boyd, Gehan-George, Haycock, Fujimoto, and Mosteller. You get to pick the formula of choice while performing the calculation. Along with that, you have to provide the weight and height in either the imperial unit system or the metric unit system. With that, you can easily get the BSA in square meters.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios, Boyd, Gehan-George, Haycock, Fujimoto, and Mosteller).
• Unit System: Imperial and Metric.

EasyCalculation.com

EasyCalculation.com offers a wide collection of online calculators. Among those calculators, there is a body surface area calculator that covers DuBios, Boyd, Gehan-George, Haycock, and Mosteller BSA formulas. These formula choices appear at the top of the calculator as tabs. From there, you can pick the BSA approach of choice and add the weight and height. The calculator supports imperial and metric unit systems. You can select a desired unit to enter the correct parameters. Once done, the calculator gives you the body surface area.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios, Boyd, Gehan-George, Haycock, and Mosteller).
• Unit System: Imperial and Metric.

Calculators.tech

Calculators.tech is another free website that has a catalog of online calculators. It offers a simple BSA calculator. This calculator gets you the DuBios body surface area. To do that, you have to enter the weight and height into the calculator. The calculator supports multiple measurement units of imperial and metric unit systems. You can select the units of choice for weight and height. With that, you can easily calculate the BSA using this calculator.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios).
• Unit System: Imperial and Metric.

Calculator-Online.net

Calculator-Online.net provides a free BSA calculator. The highlight of this calculator is that it supports 8 approaches for BSA calculation. This includes DuBios, Boyd, Gehan-George, Mosteller, Haycock, Fujimoto, Takahira, and Schlich. When you run the calculator, it shows the BSA using all 8 formulas. To be able to do that, you have to add the weight and height into the calculator along with the gender. It supports multiple measurement units under imperial and metric unit systems. You can select the units as per your data and then perform the calculations.

Highlights:

• Input: Gender, Weight, and Height.
• Output: BSA (DuBios, Boyd, Gehan-George, Mosteller, Haycock, Fujimoto, Takahira, and Schlich).
• Unit System: Imperial and Metric.

Medscape.com

Medscape.com also offers a free online BSA calculator. This is a simple calculator that follows a stepwise approach. When you open this calculator, it asks you to enter the weight of the person to calculate the BSA. You can pick between imperial and metric unit systems and enter the respective value of the weight. Then you have to move to the next step where you have to add the height in a similar manner. After that, it gets you the results covering BSA, BMI, and weight category.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios), BMI, and Weight Category.
• Unit System: Imperial and Metric.

MedicineWorld.org

MedicineWorld.org offers a simple body surface area and dose calculator. This calculator determines the BSA from the weight and height of the person. It has radio buttons alongside each input to pick from imperial and metric unit systems. You can select the desired unit and add the data. Along with that, you can also add the medication dose and run the calculator. The outputs give you the BSA of the person and the medication dose based on the body surface area.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios) and Dose Calculation.
• Unit System: Imperial and Metric.

CalcTool.org

CalcTool.org is a free website where you can find online calculators covering various topics and subjects. It has a BSA calculator that is similar to the one you get on OmniCalculator. By default, it uses the DuBois approach to calculate the BSA from weight and height. But you can toggle to an “advanced mode” that gets you BSA for Fujimoto, Gehan & George, Haycock, Mosteller, Schlich (men), Schlich (women), Shuter & Aslani, and Takahira as well.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBois, Fujimoto, Gehan & George, Haycock, Mosteller, Schlich-men, Schlich-women, Shuter & Aslani, and Takahira).
• Unit System: Imperial and Metric.

MyTecBits.com

MyTecBits.com has an online BSA (Body Surface Area) calculator. You can use this calculator to determine body surface area based on eight different approaches. The calculator takes weight and height as inputs. It supports the imperial unit system and metric unit system. You can enter the input parameters in any of those unit systems. After that, you can select from DuBios, Boyd, Gehan-George, Fujimoto, Haycock, Schlich, Takahira, and Mosteller. Then you can perform the calculation and get the BSA based on a selected formula.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios, Boyd, Gehan-George, Fujimoto, Haycock, Schlich, Takahira, and Mosteller).
• Unit System: Imperial and Metric.

GlobalRPh.com

GlobalRPh.com is a clinical reference website. This website has a body surface area calculator. This calculator works with imperial and metric unit systems and calculates BSA using the DuBios approach. It also has an optional section for the medication dose. You can define the doze alongside the weight and height. When you do that, it also calculates the medication dose as per the body surface area. This calculator also lets you export the results in PDF format. So you can perform calculations and save the BSA and doze measurements.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios) and Medication Dose.
• Unit System: Imperial and Metric.

PediatricOnCall.com

PediatricOnCall.com provides information and tools on various medical topics. It has a body surface area calculator. This calculator is slightly different from others. It takes weight and height as inputs. You can provide the input either in the metric unit system or the imperial unit system. Along with that, it also asks you to pick a method for calculation. This section lists a bunch of options based on race. You can pick one or set it to “decline to answer”. The output gives you the BSA based on the method you selected.

Highlights:

• Input: Weight, Height, and Method.
• Output: BSA.
• Unit System: Imperial and Metric.

MSDManuals.com

MSDManuals.com has a free online body surface area calculator. This is a simple calculator that uses the DuBios approach to calculate the BSA. It takes weight and height as the input for calculation. Both these parameters can be added as per the imperial unit system or metric unit system. Apart from that, you can also pick a unit of choice for the BSA and select the decimal precision for it. With that, you can use this calculator to determine the body surface area.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios).
• Unit System: Imperial and Metric.

BCBST.com

BCBST.com has a free BSA calculator. This calculator has a minimal appearance with two input parameter sections; weight and height. It can take weight in kg, lb, or oz. Similarly, it can take height in cm or inches. You can pick the unit of your choice and then add the data. Then you can perform the calculation with a click of a button. This calculator gives the body surface area in meters square. That is all you get with this calculator.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios).
• Unit System: Imperial and Metric.

EBMConsult.com

EBMConsult.com offers a multipurpose calculator that can calculate BSA, BMI, Ideal Body Mass, Body Mass Index, and more. It works with imperial and metric unit systems. You can set the desired unit system for all parameters or pick it individually for applicable parameters. Then you can add the weight and height along with gender and age. With those inputs, it gets you the BSA using DuBios, Boyd, Gehan-George, Haycock, and Mosteller approaches. Alongside the BSA, it shows Body Mass Index, Total Body Weight, Ideal Body Weight, Lean Body Weight, Adjusted Body Weight, etc.

Highlights:

• Input: Gender, Age, Weight, and Height.
• Output: BSA (DuBios, Boyd, Gehan-George, Haycock, and Mosteller), Lean Body Mass, BMI, etc.
• Unit System: Imperial and Metric.

VetoncologyConsults.com

VetoncologyConsults.com is a BSA calculator for animals. You can use this calculator to determine the body surface area of a dog, a cat, a ferret, a guinea pig, and a horse. First, you have to select the animal and then add its weight. You can provide the weight in kilograms or pounds. After that, you can simply run the calculator to get the BSA of the selected animal.

Highlights:

• Input: Animal Type, Weight, and Height.
• Output: BSA (DuBios).
• Unit System: Imperial and Metric.

CancerTherapyAdvisor.com

CancerTherapyAdvisor.com is a website that provides medical advice and information on various topics. It features a free online BSA calculator. The calculator is quite simple in terms of functionality as well as the interface. It shows the BSA formula at the top which is DuBios here. Then you get the input sections for weight and height. You can pick the desired unit for both parameters and add your data. Then you can perform the calculation to get the body surface area.

Highlights:

• Input: Weight and Height.
• Output: BSA (DuBios).
• Unit System: Imperial and Metric.