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Skinfold Body Fat worksheet

Grades 8–9

Solve each problem and show your work. Round answers to 2 decimal places where needed.

1.
Problem 1.
- Sex: Female
- Method: 3-site
- Age: 48 years
- Triceps skinfold: 15 mm
- Suprailiac skinfold: 12 mm
- Thigh skinfold: 13 mm
Find: Estimated body fat
Answer
2.
Problem 2.
- Sex: Male
- Method: 7-site
- Age: 24 years
- Chest skinfold: 13 mm
- Midaxillary skinfold: 14 mm
- Triceps skinfold: 16 mm
- Subscapular skinfold: 13 mm
- Abdomen skinfold: 16 mm
- Suprailiac skinfold: 12 mm
- Thigh skinfold: 18 mm
Find: Estimated body fat
Answer
3.
Problem 3.
- Sex: Female
- Method: 3-site
- Age: 40 years
- Triceps skinfold: 20 mm
- Suprailiac skinfold: 12 mm
- Thigh skinfold: 22 mm
Find: Estimated body fat
Answer
4.
Problem 4.
- Sex: Male
- Method: 7-site
- Age: 42 years
- Chest skinfold: 10 mm
- Midaxillary skinfold: 13 mm
- Triceps skinfold: 16 mm
- Subscapular skinfold: 15 mm
- Abdomen skinfold: 22 mm
- Suprailiac skinfold: 9 mm
- Thigh skinfold: 15 mm
Find: Estimated body fat
Answer
5.
Problem 5.
- Sex: Male
- Method: 7-site
- Age: 45 years
- Chest skinfold: 7 mm
- Midaxillary skinfold: 14 mm
- Triceps skinfold: 16 mm
- Subscapular skinfold: 10 mm
- Abdomen skinfold: 24 mm
- Suprailiac skinfold: 20 mm
- Thigh skinfold: 13 mm
Find: Estimated body fat
Answer
6.
Problem 6.
- Sex: Male
- Method: 7-site
- Age: 34 years
- Chest skinfold: 11 mm
- Midaxillary skinfold: 11 mm
- Triceps skinfold: 15 mm
- Subscapular skinfold: 15 mm
- Abdomen skinfold: 18 mm
- Suprailiac skinfold: 11 mm
- Thigh skinfold: 15 mm
Find: Estimated body fat
Answer
7.
Problem 7.
- Sex: Male
- Method: 7-site
- Age: 39 years
- Chest skinfold: 10 mm
- Midaxillary skinfold: 11 mm
- Triceps skinfold: 12 mm
- Subscapular skinfold: 14 mm
- Abdomen skinfold: 20 mm
- Suprailiac skinfold: 16 mm
- Thigh skinfold: 16 mm
Find: Estimated body fat
Answer
8.
Problem 8.
- Sex: Female
- Method: 3-site
- Age: 40 years
- Triceps skinfold: 11 mm
- Suprailiac skinfold: 14 mm
- Thigh skinfold: 11 mm
Find: Estimated body fat
Answer
9.
Problem 9.
- Sex: Female
- Method: 7-site
- Age: 46 years
- Chest skinfold: 14 mm
- Midaxillary skinfold: 12 mm
- Triceps skinfold: 12 mm
- Subscapular skinfold: 16 mm
- Abdomen skinfold: 20 mm
- Suprailiac skinfold: 16 mm
- Thigh skinfold: 13 mm
Find: Estimated body fat
Answer
10.
Problem 10.
- Sex: Female
- Method: 7-site
- Age: 45 years
- Chest skinfold: 12 mm
- Midaxillary skinfold: 13 mm
- Triceps skinfold: 13 mm
- Subscapular skinfold: 14 mm
- Abdomen skinfold: 26 mm
- Suprailiac skinfold: 10 mm
- Thigh skinfold: 18 mm
Find: Estimated body fat
Answer

Answer key: Skinfold Body Fat worksheet

1. Estimated body fat: 18.4%
1. Add up your 3 skinfolds (triceps, suprailiac, thigh). The equations use this total, S
  $15 + 12 + 13$ $= 40 mm$
2. Put the total and your age into the 3-site equation for women. It gives your body density: density = 1.0994921 − 0.0009929 × S + 0.0000023 × S² − 0.0001392 × age
  $1.0994921 - 0.0009929 \times 40 + 0.0000023 \times 40^{2} - 0.0001392 \times 48$ $= 1.056774 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.056774} - 450$ $= 18.406458%$
2. Estimated body fat: 14.2%
1. Add up your 7 skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh). The equations use this total, S
  $13 + 14 + 16 + 13 + 16 + 12 + 18$ $= 102 mm$
2. Put the total and your age into the 7-site equation for men. It gives your body density: density = 1.112 − 0.00043499 × S + 5.5e-7 × S² − 0.00028826 × age
  $1.112 - 0.00043499 \times 102 + 0.00000055 \times 102^{2} - 0.00028826 \times 24$ $= 1.066435 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.066435} - 450$ $= 14.163319%$
3. Estimated body fat: 22.8%
1. Add up your 3 skinfolds (triceps, suprailiac, thigh). The equations use this total, S
  $20 + 12 + 22$ $= 54 mm$
2. Put the total and your age into the 3-site equation for women. It gives your body density: density = 1.0994921 − 0.0009929 × S + 0.0000023 × S² − 0.0001392 × age
  $1.0994921 - 0.0009929 \times 54 + 0.0000023 \times 54^{2} - 0.0001392 \times 40$ $= 1.047014 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.047014} - 450$ $= 22.772912%$
4. Estimated body fat: 16.1%
1. Add up your 7 skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh). The equations use this total, S
  $10 + 13 + 16 + 15 + 22 + 9 + 15$ $= 100 mm$
2. Put the total and your age into the 7-site equation for men. It gives your body density: density = 1.112 − 0.00043499 × S + 5.5e-7 × S² − 0.00028826 × age
  $1.112 - 0.00043499 \times 100 + 0.00000055 \times 100^{2} - 0.00028826 \times 42$ $= 1.061894 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.061894} - 450$ $= 16.148187%$
5. Estimated body fat: 17.1%
1. Add up your 7 skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh). The equations use this total, S
  $7 + 14 + 16 + 10 + 24 + 20 + 13$ $= 104 mm$
2. Put the total and your age into the 7-site equation for men. It gives your body density: density = 1.112 − 0.00043499 × S + 5.5e-7 × S² − 0.00028826 × age
  $1.112 - 0.00043499 \times 104 + 0.00000055 \times 104^{2} - 0.00028826 \times 45$ $= 1.059738 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.059738} - 450$ $= 17.096523%$
6. Estimated body fat: 14.6%
1. Add up your 7 skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh). The equations use this total, S
  $11 + 11 + 15 + 15 + 18 + 11 + 15$ $= 96 mm$
2. Put the total and your age into the 7-site equation for men. It gives your body density: density = 1.112 − 0.00043499 × S + 5.5e-7 × S² − 0.00028826 × age
  $1.112 - 0.00043499 \times 96 + 0.00000055 \times 96^{2} - 0.00028826 \times 34$ $= 1.065509 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.065509} - 450$ $= 14.566735%$
7. Estimated body fat: 15.6%
1. Add up your 7 skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh). The equations use this total, S
  $10 + 11 + 12 + 14 + 20 + 16 + 16$ $= 99 mm$
2. Put the total and your age into the 7-site equation for men. It gives your body density: density = 1.112 − 0.00043499 × S + 5.5e-7 × S² − 0.00028826 × age
  $1.112 - 0.00043499 \times 99 + 0.00000055 \times 99^{2} - 0.00028826 \times 39$ $= 1.063084 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.063084} - 450$ $= 15.626248%$
8. Estimated body fat: 16.5%
1. Add up your 3 skinfolds (triceps, suprailiac, thigh). The equations use this total, S
  $11 + 14 + 11$ $= 36 mm$
2. Put the total and your age into the 3-site equation for women. It gives your body density: density = 1.0994921 − 0.0009929 × S + 0.0000023 × S² − 0.0001392 × age
  $1.0994921 - 0.0009929 \times 36 + 0.0000023 \times 36^{2} - 0.0001392 \times 40$ $= 1.061161 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.061161} - 450$ $= 16.470435%$
9. Estimated body fat: 22%
1. Add up your 7 skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh). The equations use this total, S
  $14 + 12 + 12 + 16 + 20 + 16 + 13$ $= 103 mm$
2. Put the total and your age into the 7-site equation for women. It gives your body density: density = 1.097 − 0.00046971 × S + 5.6e-7 × S² − 0.00012828 × age
  $1.097 - 0.00046971 \times 103 + 0.00000056 \times 103^{2} - 0.00012828 \times 46$ $= 1.04866 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.04866} - 450$ $= 22.030959%$
10. Estimated body fat: 22.4%
1. Add up your 7 skinfolds (chest, midaxillary, triceps, subscapular, abdomen, suprailiac, thigh). The equations use this total, S
  $12 + 13 + 13 + 14 + 26 + 10 + 18$ $= 106 mm$
2. Put the total and your age into the 7-site equation for women. It gives your body density: density = 1.097 − 0.00046971 × S + 5.6e-7 × S² − 0.00012828 × age
  $1.097 - 0.00046971 \times 106 + 0.00000056 \times 106^{2} - 0.00012828 \times 45$ $= 1.04773 g/cm³$
3. Turn density into body fat with the Siri rule: percent body fat = 495 ÷ density − 450
  $\frac{495}{1.04773} - 450$ $= 22.449828%$