25 Best Free Online FFMI Calculator Websites

Here is a list of the best free online FFMI calculator websites. FFMI is short for Fat-Free Mass Index. FFMI is a widely used metric to measure the lean mass and body fat ratio of an individual. This index calculates muscle mass relative to height. FFMI indicates muscle development. Thus it is used by bodybuilders as a means of measurement and comparison with others. FFMI is an alternative to BMI. Where BMI only accounts for the weight and height of the individual, FFMI takes into account lean muscle mass, making it a more reliable indicator of overall body composition. To calculate your FFMI, you should know your height, weight, and body fat percentage.

This post covers 25 free websites where you can calculate FFMI online. You get dedicated calculators on all these websites. Almost all these calculators work with imperial and metric unit systems. No matter what unit system you use, you can select the system of choice and go ahead with the calculations. Within seconds, you get the FFMI on the screen. Along with the FFMI, these calculators also get you the normalized or adjusted FFMI, lean mass or fat-free mass, and body fat. You can go through the post to explore these in detail.

My Favorite Online FFMI Calculator

All these calculators work almost the same way with the same input parameters and results. You can pick any of these and get the FFMI along with other related terms. Thus, picking a favorite is more of a choice rather that a decision based on features.

You can also check our other lists of the best free online Ape Index Calculator websites, online Pregnancy Calculator websites, and Health Symptom Checker services.

Overview Table:

Websites	FFMI	Noramlized FFMI	Unit Sytem
FFMICalculator.org	✓	✓	Imperial/Metric
OmniCalculator.com	✓	✓	Imperial/Metric
Calculators.org	✓	✓	Imperial/Metric
TheCalculator.co	✓	✓	Imperial/Metric
StyleCraze.com	✓	✓	Imperial/Metric
NaturalPhysiques.com	✓	✓	Imperial
EasyCalculation.com	✓	✓	Imperial/Metric
GoodCalculators.com	✓	✓	Imperial/Metric
EzCalc.me	✓	✓	Imperial/Metric
Online-Calculator.org	✓	✓	Imperial/Metric
Calculator.academy	✓	x	Imperial
Calculator-Online.net	✓	✓	Imperial/Metric
Calculators.io	✓	✓	Imperial/Metric
BodyBuildingMealPlan.com	✓	✓	Imperial
MeanMuscles.com	✓	✓	Imperial/Metric
WorldOfMedicalSaviours.com	✓	✓	Imperial/Metric
MyMathTables.com	✓	✓	Imperial/Metric
InchCalculator.com	✓	✓	Imperial/Metric
MuscleEvo.net	✓	✓	Imperial/Metric
Calculators.tech	✓	✓	Imperial/Metric
FitnessVolt.com	✓	✓	Imperial/Metric
Tribelocus.com	✓	✓	Imperial
iCliniq.com	✓	✓	Imperial/Metric
LegionAthletics.com	✓	✓	Imperial/Metric
MDApp.co	✓	✓	Imperial/Metric

FFMICalculator.org

FFMICalculator.org is a free online FFMI calculator that calculates Fat-Free Mass. This calculator has an interactive interface where you get sliders to set the input. You have to provide the height, weight, and body fat percentage. At the top, you can change between the imperial and metric systems and add your input. The calculator then shows you the FFMI along with fat-free mass and body fat. It visualizes the FFMI on a circular scale. You get a guiding FFMI measurement line at the bottom. It marks the current FFMI on the line and shows where you stand on the FFMI.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

 

OmniCalculator.com

OmniCalculator.com, a popular website with online calculators, offers a free online FFMI calculator. The calculator page has the actual calculator on the left side accompanied by theoretical explanations on the entire page. You can read the definition with formulas, other related terminology, and comparisons. Coming back to the calculator, it has an input section to add the data. This includes sex, height, weight, and body fat. You can pick the unit of these parameters and add the data accordingly. When you do that, it gets you the FFMI. It also shows the normalized FFMI along with fat-free mass and total body fat.

Highlights:

• Input: Sex, Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

 

Calculators.org

Calculators.org offers a free online fat-free mass index calculator. This calculator supports the imperial and metric systems. You can select the measurement system you want to use at the top. Then you can add the values that require height, weight, and body fat. With these three parameters, the calculator gets you the current FFMI. Along with that, it also shows the normalized FFMI for the input covering fat-free mass and body fat.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

TheCalculator.co

TheCalculator.co is a free website with a wide collection of calculators. Under its health calculators, it has a free online FFMI calculator. The calculator is quite simple and easy to use. It asks you to pick the unit system of your choice for the calculations. You can go with the English (Imperial) or Metric system. Then you can just provide the weight, height, and body fat to get the FFMI. This calculator also shows the lean mass and shows the adjusted FFMI. It also offers an embed code that you can use to add this calculator to your site.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Adjusted FFMI.
• Unit System: Imperial and Metric.

 

StyleCraze.com

StyleCraze.com has a free online FFMI calculator. The calculator has a simple and minimalistic user interface. It has a “System” option at the top with radio buttons for Imperial and Metric. From there, you can choose the unit system of choice. Below that, you get input sections for weight, height, and body fat. Just enter the input and run the calculator. Within seconds, it gets you the FFMI along with normalized FFMI, fat-free mass, and body fat.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: FFMI, Normalize FFMI, Fat-Free Mass, and Body Fat.
• Unit System: Imperial and Metric.

 

NaturalPhysiques.com

NaturalPhysiques.com has a simple online FFMI calculator. This calculator uses the imperial unit system for the measurements. To calculate the FFMI, you have to provide the weight, height, and body fat percentage. With that, the calculator gives you the lean mass along FFMI and adjusted FFMI. The adjusted FFMI here is the same as the normalized FFMI for the given data.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial.

EasyCalculation.com

EasyCalculation.com is known for its wide collection of calculators for various topics. It offers an online FFMI calculator that you can use. This particular calculator has three input parameters; weight, body fat percentage, and height. You can pick the unit for weight and enter the value. For height, it has two separate sections; one for imperial input and another for metric. No matter what unit system, you can use this calculator to find the FFMI. Along with the FFMI, it calculates the lean mass and normalized FFMI as well.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

GoodCalculators.com

GoodCalculators.com is another website with a collection of online calculators. It has a free FFMI calculator that works with the imperial and metric unit systems. Similar to other calculators, you get to pick the unit system of choice at the top. Doing that loads the respective input fields for weight, height, and body fat percentage. You can add your values and run the calculators. The output gives you the FFMI as per the input. It shows the normalized FFMI and fat-free mass as well. It also categories the FFMI and shows your FFMI category in the output.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, FFMI, Normalize FFMI, FFMI Category.
• Unit System: Imperial and Metric.

EzCalc.me

EzCalc.me offers easy calculators covering a variety of topics and subjects. Among the health calculators, it has a free FFMI calculator. The calculator works with imperial and metric unit systems. It has radio buttons at the top to select the unit system of choice. The buttons are followed by three sliders to set height, weight, and body fat percentage. When you add your inputs, it shows you the FFMI at the top of the results. Below that, it covers normalized FFMI, fat-free mass, and body fat.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

Online-Calculator.org

Online-Calculator.org is another free website with an online FFMI calculator. To calculate the FFMI, this calculator requires weight, height, and body fat percentage. It has two separate input sections for weight and height. One section is for the imperial unit system and another is for the metric unit system. You have to enter your input in the respective section. When you do that, it gets you the results. First, it shows the fat-free mass and body fat in both unit systems. Then it gives you the FFMI along with the normalized FFMI.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

Calculator.academy

Calculator.academy is another website where you can calculate FFMI online. This website offers a simple calculator for that. The calculator supports the imperial unit system. That means you have to enter the weight in lbs and height in inches. Along with that, you also have to provide the body fat percentage. Then you can run the calculator to get the FFMI. This calculator only gets you the FFMI; it does not calculate or show any other parameters in the output.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: FFMI.
• Unit System: Imperial.

Calculator-Online.net

Calculator-Online.net has a free online FFMI calculator. This calculator has a neat interface with support for imperial and metric unit systems. It uses dropdown boxes for weight and height to select the respective unit system. Then you can just add the values along with body fat percentage. This calculator takes you to a new page to show the results. There you get the FFMI, normalized FFMI, body fat, and fat-free fat. It tells you the FFMI category and shows the BMI as well.

Highlights:

• Input: Gender, Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, Normalize FFMI, FFMI Category, and BMI.
• Unit System: Imperial and Metric.

Calculators.io

Calculators.io offers a free FFMI calculator under the Health section. This calculator can help you find your FFMI, fat-free mass, and body fat. To do that, you have to add your weight, height, and body fat percentage into the calculator. While doing so, you get a dropdown to choose from the imperial and metric unit systems for the input. As you add all the inputs, it shows you the results on the side. It also calculates the normalized FFMI for the input data. Apart from that, you can get the embed code for this calculator. This allows you to add this calculator as a widget on your website.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

BodyBuildingMealPlan.com

BodyBuildingMealPlan.com also has an online FFMI calculator. This calculator determines the FFMI from weight, height, and body fat percentage. It takes the input in the imperial unit system and uses a slider for weight body fat percentage. It also shows illustrations to help you pick the matching body fat percentage in case you are unaware of that. With that, the calculator gets you the FFMI along with the lean mass. It also shows normalized FFMI adjusted to average height as per gender.

Highlights:

• Input: Gender, Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial.

MeanMuscles.com

MeanMuscles.com is a website that focuses on muscle building and all the relevant things including meals, exercises, etc. It has an online FFMI calculator as well. This simple calculator calculates the FFMI from weight, height, and body fat percentage. It supports both, imperial and metric, unit systems. You can select the system of choice and then add your data. The results give you the FFMI, normalized FFMI, fat-free mass, and body fat. Alongside that, it also has charts with FFMI ranges for men and women.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

WorldOfMedicalSaviours.com

WorldOfMedicalSaviours.com is another website with a free online FFMI calculator. This calculator can help you calculate the lean mass, fat-free mass index, and normalized FFMI. It has three input sections asking for weight, height, and body fat percentage. You can go with the imperial or metric unit system for weight and height. The calculator has a dropdown where you can pick the unit and add the values to get the FFMI. Along with FFMI, it shows the lean mass and normalized FFMI as well.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

MyMathTables.com

MyMathTables.com is a website with a wide catalog of online calculators covering math, physics, finance, health, etc. It offers an FFMI calculator under the health category. This calculator works with imperial as well as matric unit systems. For the weight it lets you select the unit of choice. And in the case of height, you get two boxes; one for imperial input and another one for metric input. You can enter the height in either of the boxes. With the percentage of body fat, this calculator gives you the FFMI. It also shows the lean mass and the normalized FFMI. The results are followed by a section where you get the formulas used to calculate all three outputs.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

InchCalculator.com

InchCalculator.com is another website that offers online calculators for a wide range of topics. It has a free online FFMI calculator. This calculator is capable to take inputs in metric as well as imperial unit systems. You can select the unit of choice for weight and height and then add your values along with body fat percentage. When you run the calculator, it gets you the FFMI along with the normalized FFMI. It also fetches the fat-free mass and body fat in the same unit system as the inputs. This calculator offers you a share link that you can use to share the results online with others.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

MuscleEvo.net

MuscleEvo.net is an online platform that offers information on how to build muscles along with products and meal plans. It also offers an online FFMI calculator. This is a simple calculator that works with imperial (English) and metric unit systems. It has a dropdown from where you can select the unit system you want to use. Based on that, it adjusts the input fields for height and weight. Then you can simply add your values to the calculator to get the results. The results give you the lean mass followed by FFMI and normalized FFMI.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

Calculators.tech

Calculators.tech is another website with a collection of online calculators. You can find an FFMI calculator on this website. This calculator has a simple interface with an input section on the left and results on right. It supports multiple measurement units under the imperial and metric unit systems. Alongside the height and weight, you can select the desired unit and add your values. When you run the calculator, it gets you the fat-free mass, body, fat, FFMI, and normalized FFMI in a table format on the right side of the screen. Below that, it generates an “FFM by Percentile” table where you can check the FFM percentile for men and women.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

FitnessVolt.com

FitnessVolt.com is a website with a focus on fitness. It provides guides for bodybuilding, weight lifting, nutrition, workouts, and more. It has a free FFMI calculator. This is a simple calculator that comes with a toggle to switch between imperial and metric unit systems. Based on the selection, it takes the values of height and weight in the respective unit system. Then you can add the body fat percentage and run the calculator. The results show you the fat-free mass, body fat, FFMI, and normalized FFMI. Along with that, it also generates an FFMI percentile table where you can check the FFMI for men and women based on percentile.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, Body Fat, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

Tribelocus.com

Tribelocus.com is another free website with an online FFMI calculator. This calculator works with the imperial unit system only. It takes the weight in lbs and height in feet and inches. You can add the respective values along with body fat percentage to get FFMI. It also calculates the normalized FFMI and lean mass. Apart from that, the calculator has a share button that you can use to share the results. It also offers an “embed code” that you can use to add this exact calculator to your website or blog.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial.

iCliniq.com

iCliniq.com is a platform where you can consult with doctors online. It also offers many health guides and calculators. It has an FFMI calculator that you can use to find your FFMI and lean mass. The calculator works with imperial and metric unit systems. You can pick the unit of choice and then add your weight, height, and body fat percentage. With that, it gets you the FFMI and lean mass. It also gives you the adjusted FFMI in both, pounds and kilograms. Alongside the calculator, it covers the formula of each output and explains it with examples. You can follow that guide to understand how to calculate FFMI.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean Mass, FFMI, and Adjusted FFMI.
• Unit System: Imperial and Metric.

LegionAthletics.com

LegionAthletics.com is another free website where you can calculate FFMI online. This website has an FFMI calculator with a minimalistic interface. First, it has a dropdown section where you can choose the unit system of choice. It works with both, imperial and metric unit systems. After selecting the unit system, you can add the values of weight, height, and body fat percentage into the calculator. Based on that, it gets you the FFMI, normalized FFMI, and fat-free mass.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Fat-Free Mass, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.

MDApp.co

MDApp.co is a free website that offers health-related information on various topics. It has a free online FFMI calculator that you can use. This calculator can help you find your FFMI based on your height, weight, and body fat percentage. It works with imperial and metric unit systems. You can pick the unit system of choice and then add your input values. When you do that, it gets you the FFMI along with lean mass and normalized FFMI. From there, you get the option to print and share the results. You can also get an embed code to add this calculator as a widget on your website.

Highlights:

• Input: Height, Weight, and Body Fat percentage.
• Output: Lean, FFMI, and Normalize FFMI.
• Unit System: Imperial and Metric.