Calculations


Detailed Caloric Calculation

  • Macronutrient Breakdown:

    • Carbohydrates: 16 x 3.75 = 60 Kcal

    • Protein: 31 x 4 = 124 Kcal

    • Fat: 12 x 9 = 108 Kcal

  • Total Calories:

    • 60 + 124 + 108 = 292 Kcal

Energy Density Calculation

  • Example: 2 slices wholemeal bread

    • Weight: 64 g

    • Energy: 584 KJ

  • Energy Density Formula:

    • Energy Density (KJ/g) = Total Food Energy / Total Food Weight

    • Calculation: 584 KJ / 64 g = 9.1 KJ/g

Saturated Fat Guidelines

  • John's Total Caloric Intake: 2300 calories

  • Recommendation: Saturated fat intake should be <10%.

  • Calculations:

    • 10% of 2300 calories = 230 calories (or less) from saturated fat.

Protein Requirements Calculation

  • Mary's Information: 74 kg, non-exercising

  • Protein Requirement Formula:

    • Daily protein intake = Body weight x 0.8 g

    • Calculation: 74 x 0.8 g = 59.2 g/day

Starch Content Calculation

  • Typical Nutritional Values per 100g:

    • Energy (kJ): 346

    • Energy (kcal): 82

    • Carbohydrates: 17.2 g

    • Calculation for starch content per 100g: 2 - 0.6 = 16.6 g

Carbohydrates Requirement Calculation

  • Aoife's Total Caloric Intake: 2000 calories

  • Carbohydrates Recommendation: 50% of Total Daily Energy Intake (TDEI)

  • Carbohydrates Calculation:

    • 1000 calories from carbohydrates translated to grams: 1000/4 = 266.6 g

Fat-Free Mass Calculation

  • Sean's Body Mass: 93 kg, Body Fat %: 9%

  • Calculations:

    • Fat mass = Body Mass x %BF = 93 x 0.09 = 8.37 kg

    • Fat-Free Mass = Body Mass - Fat Mass = 93 – 8.37 = 84.63 kg


Body Mass Index Calculation

  • Ciarán's Information: 101 kg, 187 cm

  • BMI Calculation Formula:

    • BMI = Body Mass (kg) / Height (m²)

    • Result: BMI = 101 / (1.87)² = 28.9 kg/m²


Body Density Calculation

  • Method: Jackson & Pollock (1978)

  • Body Density Calculation Formula:

    • Body Density = 1.0994921 - (0.0009929 x sum of skinfolds) + (0.0000023 x square of the sum of skinfolds) - (0.0001392 x age)

  • Skinfold Measurements:

    • Triceps: 12.30

    • Thigh: 25.10

    • Suprailiac: 8.25

    • Age: 22 years

  • Body Density Result: 1.05



Body Fat Percentage Calculation

  • Author: Siri (1961)

  • Formula: %BF = (4.95/DB – 4.50) x 100

  • Population Group: White males/females

  • Result: 21.4% body fat


Vitamin A Intake Calculation

  • Target Population: Men and Women aged 18-35 years

  • Vitamin A Calculation:

    • Retinol and Carotene Conversion: 6 µg of beta-carotene = 1 µg of retinol


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