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Body Fat (YMCA) Calculator

How much of my weight is fat (using the YMCA formula)?

This calculator uses the formula developed by the YMCA to estimate your body fat percentage without calipers. Use a tape measure and enter your waist measurement. Combine the waist measurement with your gender and weight and this calculator will estimate your percent of body fat, how much of your weight is lean mass and how much is fat mass, and your general fitness category. The water displacement test is the most accurate way to determine body fat percent, but the Navy Body Fat test or YMCA formula is accurate within 1-3% for most people.

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Write a comment 8 comments waiting approval   this was within 1% of my calipers. I would say it's very accurate. - 11/9/2016 8:50:29 PM

Obviously Obese   So, I am female, 5'3 with a weight of 106 and a waist of 29. This calculator labeled me as obese. Obese? I walk about 2 miles a day at a fast clip. How am I obese? - 7/12/2016 12:24:55 PM

Rylie   I know that this can't be correct. I'm a female, 190 pounds and waist measurement 36 inches and this is literally the only test that hasn't told me my weight is acceptable. Every other test tells me I'm obese. I don't understand??? - 1/17/2016 10:58:47 PM

RATAN MANDAL   13-17 years age group male/ female which skinfold site are measure - 1/12/2016 10:11:34 AM

Josh   Wtf?? 17 year old male, I'm 5" 6 and 169 kg, with a waist of 40, yet it says I'm obese?? Like wtf that's not true, I'm just a little bit chubby but definitely not obese??? - 12/29/2015 6:35:09 PM

Lynn   Female size 2. I am 5'7 weigh 123 and I am obese according to your calculator. Really?? My doctors have me drinking 700 calorie shakes and are concerned about my lack of body fat. I work out at the gym 5 days a week and have been instructed by the doctors and my trainer not to do cardio because it will cause further weight loss. This calculator is sending the wrong message. - 7/1/2015 1:11:52 PM

N/a.   17 years. Male. 7%. Aw yeah. - 6/10/2015 4:14:21 AM

Lisa Cooper   I am 5ft 3in and weigh 121 lbs. according to your formula I am obese! WTF? - 5/27/2015 6:10:08 PM

Cindy   ***If you are UNDER the age of 18 this calculator is NOT for you!!! See your pediatrician for correct information regarding your weight and development. *** When figuring out if your body composition is within healthy standards you need to not only consider your height, weight and body fat%, but also your waist to hip ratio, your resting heart rate, your blood pressure, and your fitness level. For women, if your body fat is over 34% you ARE "overweight" regardless of your BMI even if it is in the "normal range". You need to eat a balanced diet and incorporate strength/resistance training into your fitness routine to increase lean body mass. This website is a fitness tool not a medical test. It's a mathematical formula which is only accurate enough for a general estimate, but works well when you compare it to yourself as you track your own progress during a fitness plan, the margin of error will be the same each time. The only way to get your true body percentage is a water density test done by a medical specialist. - 5/1/2015 4:58:51 AM

dulce   Na - 4/14/2015 8:46:17 PM

Not a girl   Lol at all the pissy teenage girls pissed at the online calculator that just called them fatsos, this is obviously not accurate, doesnt take in count age, height and lots of other things, if you want someone to call you fat to your face go to a real nutritionist and tell him to measure your body fat - 1/28/2015 8:49:13 PM

bullsh!t   i am 17 years old.I am 65 kg and my waist is 93,the calculator says me %30 body fat mass! what the hell is going on this calculator.Bullshit - 11/3/2014 10:45:10 AM

ben   I am 14 years old and i am 5' 3", 95 lbs, and my waist is 25 in. It says i am -3% body fat??? worst calculator, to not trust it! - 10/25/2014 4:39:34 PM

PilatesGirl   I am 171cm tall, 59 kg, with the stats bust 81cm, 66cm, 96cm. I am not underweight at all but is am definitely on the skinnier side of body types, I just wanted to know my body fat percentage. This came up as 41%, obese?!?! Clearly vastly inaccurate, I do not look like a beach ball! - 9/7/2014 4:56:38 AM

me   i'm 14 and 5 foot 7 and 107 lbs and it said I have 5% and i'm 'dangerously low' whaaaat!? i'm pretty sure i'm like average because I don't feel super skinny, I meen obviously i'm not fat at all but I don't look anorexic which is what this suggests :3 bit confused here!! my waist is 22 inches, am I a healthy weight? - 9/2/2014 8:25:17 AM

tv marathoner   um.... they do need height. so oen of these calculators said i was obese at 31% and this one says 19% if i measure at thinnest part 28.5 (which is what women are supposed to do, only men do a navel...) and 26% measured at navel (which is Wrong) most often i get 24-27 on these calculators looking at different ones to try and get a more accurate number. i am 5' 9" 150 pounds. which means like 22 bmi. however i normally get around 26 only with ones that factor in my butt... : ) and having muscles and no fat does make u under weight btw. so anonymous under me is wrong. probably anorexic and doesnt realize it. i think personally beign younger means that having a 26% is little chubby (like as in 5-8 extra pounds, i dont know what your defention is, but that is mine). however, i have been told by people that i am not chubby at all.... ( i know i sadi tv marathoner, but i can easiyl swim a mile, did it last week, and can do a mile running in under 10 minutes(havent timed myself in a while, but last time it was like 9;30) which isnt great but i can do 19 push ups, which also isnt amazing but not overweight! or "acceptable" aka danger of over weight. sry, i like to rant. - 6/18/2014 8:04:57 PM

berrychild   These measurements are all messed up. They dont even calculate your height into problem. I weight 130lbs at 5'7" with a 31 in waist. I am very thin with a little belly fat. It Says I have 32percent body fat and I am obese. Ya'll need a new calculation!!!!!!! - 6/11/2014 12:51:13 PM

Trish   Awful!! I am 34 years old, 5'3" and weigh 110lbs soaking wet. This thing says I am OBESE! I may not be muscular but I am definitely not obese. - 6/4/2014 11:14:51 AM

Female Athlete   I am a national team athlete in my prime fitness (swimmer). I can do 60 chin ups and am lean. 5'7", 120lbs with a waist of 33 because of oblexe, it says I am obese... highly unlikely - 5/6/2014 2:17:28 PM

Matt   You're basing obesity from your BMI measurement? How do you think bodybuilders factor in with such a measurement? - 12/13/2013 9:33:25 AM

Field Help

Input Fields

TitleA title for these calculator results that will help you identify it if you have printed out several versions of the calculator.

US/MetricChoose US or Metric units.

GenderSelect your gender.

WeightYour current scale weight.

Waist (at navel)Your waist measurement at the navel (or belly button).

Output Fields

Body FatThe approximate percentage of your body's mass that is made up of fat.

Fat MassThe portion of your weight that is fat.

Lean MassThe portion of your weight that is lean (not fat).

Body Fat CategoryYour body fat category depends on your gender and your body fat percentage.

Body Fat Categories TableThis table shows you the Body Fat Range for each Classification so you can see how close your calculated Body Fat percentage is to the next Body Fat Classification range.

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