Fitness Calculators

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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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Samia   Body fat estimate - 6/7/2017 7:33:43 PM

Daisy   I weigh 102 lbs and 25 inch waist and apparently I'm underweight. I'm 5 foot eight! - 4/16/2017 12:00:03 PM

Calum   I'm 5'8 and 120 pounds, my waist is 28 in. This calculator says I'm 7% body fat. Awesome! - 4/4/2017 5:24:25 PM

Sam   ...This is pretty inaccurate. Play around with the numbers - 130lbs and 24 inch navel = dangerously low 150lbs and 24inch navel = dangerously low Seriously? 20lbs more and still low? Noooope. - 4/2/2017 8:55:33 AM

Danish Mashkoor   Male Weight 121 lbs Waist 27 inch Body Fat 3% Fat Mass 4 lbs Lean Mass 117 lbs Body Fat Category Essential Fat - 3/7/2017 7:48:19 AM

Tom   this was accurate, when I changed my gender from Male to Female. Otherwise, not even close. - 3/6/2017 1:36:27 PM

Nivi   Very inaccurate. I am into fitness for three years and i have never been overweight all my life. I am 5'1 , 29inch waist and it labelled me Obese! - 2/13/2017 8:17:54 AM

J.J   30% that can't be true I am 13 year old girl who is 95 pounds and 5'2. What the flip?! Will someone recommend a calculator that works so I know how long it takes to get a six pack. I am told 3-6 weeks but i just want to be sure. Please help. - 1/21/2017 9:59:28 PM

FUTURE ROTC DUDE   It says Im fit for a 6'2" 235lbs dude with a 16in neck and 37 wiast and 38 hip. have ti lose more weight i guess :/ - 12/23/2016 4:09:17 PM

S.C.to   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


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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