Contest: Guess My Body Fat Percentage

Before we get to today’s actual post, I have a challenge. At the risk of sounding like a carny barker, guess my body fat and win a Damage Control Master Formula. The winner will be the one who, before tomorrow’s post, guesses what the “gold standard” hydrostatic test showed my body fat percentage to be – to the nearest tenth of a percent without going over. (Submit your best guess in the comment board.) If several people guess the same number, we will draw a winner from that group. Malibu gym members are specifically excluded from this competition (’cause that’s where I had the test done). This photo was taken around the same time.


Find out who won the contest and learn the value of lab values by clicking here.

About the Author

Mark Sisson is the founder of Mark’s Daily Apple, godfather to the Primal food and lifestyle movement, and the New York Times bestselling author of The Keto Reset Diet. His latest book is Keto for Life, where he discusses how he combines the keto diet with a Primal lifestyle for optimal health and longevity. Mark is the author of numerous other books as well, including The Primal Blueprint, which was credited with turbocharging the growth of the primal/paleo movement back in 2009. After spending three decades researching and educating folks on why food is the key component to achieving and maintaining optimal wellness, Mark launched Primal Kitchen, a real-food company that creates Primal/paleo, keto, and Whole30-friendly kitchen staples.

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360 thoughts on “Contest: Guess My Body Fat Percentage”

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  1. No matter the number, you do look awesome. More importantly, you feel awesome!


    I bet someone will go all Price is Right and guess 0.1%.

  2. Great photo! Very motivational.
    I would guess 5.7%
    Never been near that myself, but still trying. Stay strong!

  3. I have a really cool computer program, BF 123, that analyzes digital pictures and gives you the bodyfat percentage. Hah, just kidding of course. My expert eye tells me you are at 6.3%.

  4. I’m changing mine to 5.5% Since mine is 11% and you look twice as awesome as me right now.

  5. i’m going to be the oddball here and guess that those machines don’t work as well as they ought to and have some ingrained CW something or other….
    so my guess is that the machine said 12.5%.
    but that it is wrong. but that’s what it said. kill the machine.

  6. Anyway Mark would not be so tasty to cannibal person, because of so little fat xd

    1. 8.1 % did you do anything different that day or day before like fast or dehydrate, just wondering, 245 last year now 210 and going down. Love primal, not exercising too much yet ,rotator hurting and winter time, watching 3 little ones but feeling great. Go primal, first time wearing a belt in five years, Thanks, Mark. Dan the priaml man. Thinking of starting my own primal group in Holland, Mi.

  7. 8.2% you have slightly rounded shoulders? or are you flexing in this pic.

  8. 0% – Mark destroys bodyfat just by existing.

    Actually, I take it back…
    NEGATIVE 15%.

  9. 6.3%… since going Primal I’ve cut my BF% in half from about 14 – 15%. Not bad for a few months’ play!

  10. my guess is going to be in the negatives because this contest has me thinking youre kind of a meat head….the highest quality grass-fed of course……………

  11. I’m gonna say 5.3%, although we can’t see your legs and back. But I am also willing to wager that if you measure your pectoral skin fold with a caliper, it will be less than 3mm!

  12. I have no way of guessing. But hubby said to guess 12%. So I’m guessing 11.11% since I love the number 11 and I don’t follow instructions too well ;P

  13. Fat? There’s supposed to be fat on that animal? Where? Behind the ears? Armpits?

    I will say 3.8%

  14. Actually are an inspiration to us beginning our journey on the PB. Thank you

    I would guess you to be 4.7% bodyfat.

  15. I look forward to the day I can start my own fitness blog and post topless photos of myself willy-nilly…..

    Oh, yes, back to the topic at hand…I’d say 8%.

  16. Gosh…if I could only remember back to your talk @ Diablo Fit…I bet you told us! 5.8%

  17. What ever it is your looking good! I wish I was shredded like that!

    My guess is 6.7%

  18. Seems like you’ve got enough contestants that you could’ve asked for hundredths of a percent… I’ve lost 10+ pounds just READING all the other guesses! Mine is: 8.7%

  19. Sitting here in Rotterdam looking at the freezing snow outside, it’s the suntan I find almost as depressing as the body !

    8.4% and not an ounce more….

  20. I can’t begin to guess, but you look brilliant! Just that picture should be ample nudging (I’m thinking of myself) to do the primal lifestyle.

    Awesome Mark.

  21. Now that you’ve spilled the beans, I’m curious as to what those body fat bathroom scales had you at?

  22. Mark,

    Amazing. I did the Bod pod test a few months ago and I was listed at 11.9% This is Pre-Primal. I am not quite as lean as you are but I thought I would be sub 10% What are you thoughts on the test?

  23. I’d like to know about the bathroom scale too. Mine says I am super fat.

    And I’d like to know the answer! You look great!

  24. How can I guess when I can’t see your legs?

    I am going to guess “wicked low”.

    Thanks for the inspiration!

  25. Nice proof-of-pudding Mark. I too have been banged my head against body fat (and lab) results for years as most of my body fat is stored in my upper body and the 11.9% percentage is not representative of my health.

    By the way, I would have guessed 4.6% on you!

  26. he looks incredibley fit for his age(or any age)could someone provide a link to his workout.

  27. oh no, i missed the guessing game here. but still i would like to say, you got a perfect body my friend. keep up the good work!

  28. 7.0- I have to say I saw somwhere around here you didn’t eat the skin of a chicken for your lunch or dinner. I know if it’s even possible for me to look like you I’m pretty sure I,d have to watch very carefully my quantity (calories) as well as quality (Primal)- and by the way, I bet Grok ate that chicken skin!

  29. hey im not a loyal fan of this guy, so maybe i just havent been swayed by his…errrr…..awesomeness or whatever….i just stumbled on this page……..but doesnt this strike any of you as a bet egotistical……………hey everybodddddy guess my body fat….im also not some 300 pound man judging from my mother’s basement….im 7 percent body…..just saying

  30. Your are 6.1 % bodyfat

    most of the FAT between the ears ( for healthy brain)