Health Logo. FFMI Calculator

Fat Free Mass Index Calculator.

FFMI is an alternative to body mass index which accounts for a person's muscle mass. The average male scores about 19 and it is hard to score above 25 without using steroids or other banned substances.

Imperial

Height feet inches
Weight pounds
Body fat %

Fat-free mass pounds
Body fat pounds
FFMI
Normalized FFMI

Metric

Weight kilos
Height meters
Body fat %

Fat-free mass kilos
Body fat kilos
FFMI
Normalized FFMI

Mathematical Formulas

  • Total Body Fat = Weight * (body fat % / 100)
  • Lean Weight = Weight * (1 - (body fat % / 100)
  • FFMI = (Lean Weight / 2.2)/ ((Feet * 12.0 + Inches) * 0.0254)2
  • Adjusted FFMI = FFMI + ( 6.3 * (1.8 - (Feet * 12.0 + Inches) * 0.0254))

FFM by Percentile

Percentile Men Women
95% 22 18.5
90% 21 18
75% 20 17
50% 19 16

FFMI Ranges for Men

Description FFMI Range Body fat percent
Skinny guy 17-18 10-18
Typical average guy 18-20 20-27
Fat guy 19-21 25-40
Athlete / regular gym user 20-21 10-18
Advanced gym freak 22-23 6-12
Elite strength athlete (bodybuilders, etc.) 24-25 8-20

FFMI Ranges for Women

Description FFMI Range Body fat percent
Skinny woman 14-15 20-25
Typical average woman 14-17 22-35
Fat woman 15-18 30-45
Athlete / regular gym user 16-17 18-25
Advanced gym freak 18-20 15-22
Elite strength athlete (bodybuilders, etc.) 19-21 15-30

Notable Athletes

Fat-free mass index in users and nonusers of anabolic-androgenic steroids is an excellent study which uses information from the pre-steroid era to establish a baseline on likely steroid usage among modern athletes and bodybuilders. The below table includes the performance of Mr. America winners from before the steroid era to some current athletes. Some sumo wrestlers have exceptionally high FFMI scores which can significantly exceed normal ranges.

Name Year Adjusted FFMI Height Weight Claim to Fame
Bert Goodrich 1939 24.3     Mr. America winner
Roland Essmaker 1939 22.6     Mr. America winner
John Grimek 1940 24.0 5 ft 8.5 in 185 lbs. Mr. America winner
John Grimek 1941 26.9 5 ft 8.5 in 185 lbs. Mr. America winner
Frank Leight 1942 25.5     Mr. America winner
Jules Bacon 1943 23.9     Mr. America winner
Steve Stanko 1944 27.3 5 ft 11 in 223 lbs. Mr. America winner
Clarence Ross 1945 26.1     Mr. America winner
Alan Stephen 1946 25.9     Mr. America winner
Steve Reeves 1947 23.0     Mr. America winner
George Eiferman 1948 27.7     Mr. America winner
Jack Delinger 1949 28.0     Mr. America winner
John Farbotnik 1950 26.5     Mr. America winner
Roy Hilligenn 1951 26.0     Mr. America winner
Jim Park 1952 N/A     Mr. America winner
Bill Pearl 1953 25.8 5 ft 9 in to 10 in 201 to 242 lbs. Mr. America winner
Dick DuBois 1954 25.4     Mr. America winner
Steve Klisanin 1955 23.5     Mr. America winner
Ray Schaeffer 1956 N/A     Mr. America winner
Ron Lacy 1957 25.2     Mr. America winner
Tom Sansone 1958 26.8     Mr. America winner
Harry Johnson 1959 24.6     Mr. America winner
Mean of Mr. America winenrs 1939-59 25.4 +/- 1.5      
Barry Bonds 2001 28 6 ft 2 in 228 lbs. Home run king
Alex Rodriguez   26.4 6 ft 1.5 in 229 lbs. Baseball player
Jose Canseco   26.8 6 ft 4 in 240 lbs. Baseball player
Roger Clemens   26.0 6 ft 4 in 236 lbs. Baseball player, pitcher
Arnold Schwarzenegger 1974 28.5 6 ft 2 in 236 lbs. Mr Olympia, actor

Sources:

Exercise Cartoon

Unwanted Stolen Selfie Returned to Original Owner.

Man I Hate Legs Day.