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Calculator Preferences
3-Site Body Composition Calculator Sign
3-Site Body Composition Calculator

This weight-loss calculator can be used to quickly calculate your body fat percentage when using a skinfold caliper to perform a 3-site skin fold test. The pop-up tips include directions and images showing how and where the skin fold tests are taking from -- for both males and females. The Learn tab includes:

  • 3-site skinfold testing formulas for both genders.
  • Body fat percentage categories chart.
Learn More

Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
Units:Units:Measurement:Preferred units of measurement:

Units of measurement:

Select your preferred units of measurement. Note that since calipers typically measure in millimeter increments, your preferred measurement selection only affects the weight entry. All other measurements must be entered as millimeters (mm).

Gender:Gender:Gender:Gender:

Gender:

Select male or female. This will add and remove rows based on which measurements are required for each gender.

Age:Age:Age:Age:

Age:

Enter your current age.

Weight:Weight:Weight:Weight:

Weight:

Enter your weight in your chosen unit of measurement. Pounds for standard and kilograms for metric.

Hip avg:Hip average:Hip average:Hip (suprailiac or iliac crest) average:
Enter 3 hip measurements
1st
2nd
3rd

Hip (suprailiac or iliac crest):

Female Only

Enter the average of three hip caliper tests, or click the button to enter three measurements and have the calculator compute the average for you -- plus enter it into the appropriate field.

This skin fold is right below the front or anterior part of the armpit (axilla). From here follow a vertical line until you hit the hipbone. The skin fold is an angled one (approx. 45 degrees going up and away from the body) 2 centimeters right above the iliac crest. The fold spot should be between the top of the hipbone on the side and the bony part on the lower right of the belly, which is still the same hipbone.

3-Site Body Composition Calculator: Female suprailiac caliper measurement
Tric avg:Tricep average:Tricep average:Tricep (upper arm, back) average:
Enter 3 Tricep Measurements
1st
2nd
3rd

Tricep (upper arm, back):

Female Only

Enter the average (in millimeters) of three tricep caliper tests, or click the button to enter three measurements and have the calculator compute the average for you -- plus enter it into the appropriate field.

Pinch a vertical skin fold halfway the upper arm. If you want to be more precise, use a tape between the bony top of the shoulder or acromiale (do not confuse it with the bony upper part of the shoulder blade!) and the most prominent tip of the elbow (radiale). Mark a dot or a horizontal line at half the measured distance, here is where the vertical fat fold should be pinched. Face the hand palm forward.

3-Site Body Composition Calculator: Female tricep caliper measurement
Quad avg:Thigh average:Thigh average:Thigh (quadriceps) average:
Enter 3 Thigh Measurements
1st
2nd
3rd

Thigh (quadriceps):

Male & Female

Enter the average (in millimeters) of three thigh caliper tests, or click the button to enter three measurements and have the calculator compute the average for you -- plus enter it into the appropriate field.

The skin fold here should be taken in the front, halfway from the upper part of the knee (proximal patella, where it corners when the leg is bend) and the fold above the thigh when the leg is raised (inguinal fold). The vertical fold should be pinched a little harder as fat and skin tissue in this area tends to be somewhat firmer. The thigh skin fold may therefore overestimate fat content.

3-Site Body Composition Calculator: Female thigh caliper measurement
3-Site Body Composition Calculator: Male thigh caliper measurement
Chest avg:Chest average:Chest average:Chest (pectoral) average:
Enter 3 Chest Measurements
1st
2nd
3rd

Chest (pectoral):

Male Only

Enter the average (in millimeters) of three chest caliper tests, or click the button to enter three measurements and have the calculator compute the average for you -- plus enter it into the appropriate field.

The pinch is taken between the nipple and the armpit (axilla) but closer to the armpit, approximately 1/3 the distance. The skin fold is a diagonal one in the direction of the nipple-armpit line.

3-Site Body Composition Calculator: Male pectoral caliper measurement
Belly avg:Belly average:Belly average:Belly (abdomen) average:
Enter 3 Belly Measurements
1st
2nd
3rd

Belly (abdomen):

Male Only

Enter the average (in millimeters) of three belly caliper tests, or click the button to enter three measurements and have the calculator compute the average for you -- plus enter it into the appropriate field.

A vertical or horizontal fold is taken 2 centimeters to the right of the bellybutton (umbilicus). The vertical pinch is mostly used as the fat folds easier with most people. Some might find the horizontal pinch to fold easier. Use the direction that allows the most comfortable measurement.

3-Site Body Composition Calculator: Male abdominal caliper measurement
Body fat %:Body fat percent:Body fat percentage:Body fat percentage:

Body fat percentage:

Based on your entries, this is your calculated body fat percentage.

Fat wgt:Fat weight:Body fat in weight:Body fat in weight:

Body fat in weight:

Based on your entries, this is the calculated weight of your body fat listed in your preferred unit of weight (standard or metric).

Lean wgt:Lean weight:Lean body weight:Lean body weight:

Lean body weight:

Based on your entries, this is the calculated weight of your lean body weight listed in your preferred unit of weight (standard or metric).

If you would like to save the current entries to the secure database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

Feedback AppreciatedFeedback Greatly AppreciatedYour Feedback Would Be Greatly AppreciatedYour Feedback Is Greatly Appreciated
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Tip

Help and Tools

Help and Tools:

This section, which you can Unstick or Hide in the Calculator Preferences (just above the top of the calculator), contains the following tabs (content too long to fit within bordered frame can be scrolled up and down):

About: Click this tab for an introduction to the calculator.

Instructions: Click this tab for step-by-step instructions for using the calculator.

Terms: Click this tab for a list of the descriptions that are located within each popup help button (info icons).

PCalc: Click this tab for a handy "pocket" calculator you can use when you need to calculate an entry needed for the calculator.

Data: Click this tab to save a set of entries or a note in between visits. Entries and notes will be stored to your web browser's local storage (if supported by your browser of choice), meaning they can only be recalled with the same device and web browser you were using when you saved them. If you'd like to save entries and notes between devices you can do so by subscribing to the Ad-Free Member Version.

 

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