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Real-Life Math -- Solution

You want to figure out how many calories a 25-year-old woman who is 5'5" is allowed each day to maintain a weight of 120 pounds. Then you want to calculate the number of calories a 25-year-old man who is 6 feet tall is allowed each day to maintain a weight of 160 pounds.

First, you have to convert to metric.

Woman:


5'5" = 65 inches
65 inches x 2.54 cm per inch = 165.1 cm

120 pounds x 0.4536 kg per pound = 54.4 kg

Man:
6 feet = 72 inches
72 inches x 2.54 cm per inch = 182.8 cm

160 pounds x 0.4536 kg per pound = 72.6 kg

Now you can plug the values into the equations.

Woman:

BMR = 655 + (9.6 x weight in kg) + (1.8 x height in cm) - (4.7 x age in years)

BMR = 655 + (9.6 x 54.4 kg) + (1.8 x 165.1 cm) - (4.7 x 25)
BMR = 655 + 522.2 + 297.2 - 117.5
BMR = 1,356.9

The woman is allowed 1,356.9 calories per day.

Man: BMR = 66 + (13.7 x weight in kg) + (5 x height in cm) - (6.8 x age in years)

BMR = 66 + (13.7 x 72.6 kg) + (5 x 182.8 cm) - (6.8 x 25)
BMR = 66 + 994.6 + 914 - 170
BMR = 1,804.6

The man is allowed 1,804.6calories per day.