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Calories:

Daily caloric needs to maintain weight

note: kg = pounds divided by 2.2 (ie: 180 lbs / 2.2 = 81.8 kg)

Approximation:

>Men
kg (body weight) x 24 = kcal/day

 

These calculations do not take physical activity, medical conditions, or age into consideration... for a more accurate estimate of caloric needs - the following equations are used:

note:
kg = pounds divided by 2.2 (ie: 180 lbs / 2.2 = 81.8 kg)
cm =  inches multiplied by 2.54 (ie: 68 inches x 2.54 = 173 cm)

Harris-Benedict equations:

Men:
BMR = 66 + (13.7 x wt in kg) + (5 x ht in cm) - (6.8 x age in yrs)

Women:
BMR = 655 + (9.6 x wt in kg) + (1.8 x ht in cm) - (4.7 x age in yrs)

Other BMR (basal metabolic rate) formulas

BMR without exercise:
note: (wt = body weight in kg)
 

Sex and Age BMR Equation (kcal/day)
Males
0-3 yrs (60.9 x wt) - 54
3-10 yrs (22.7 x wt) + 495
10-18 yrs (17.5 x wt) + 651
18-30 yrs (15.3 x wt) + 679
30-50 yrs (11.6 x wt) + 879
over 60 yrs (13.5 x wt) + 487
   
Females
0-3 yrs (61.0 x wt) - 51
3-10 yrs (22.5 x wt) + 499
10-18 yrs (12.2 x wt) + 746
18-30 yrs (14.7 x wt) + 496
30-60 yrs (8.7 x wt) + 829
over 60 yrs (10.5 x wt) + 596
 

 
To include exercise - multiply BMR by the appropriate activity factor:
 
Level Type Of Activity Factor
Very light Cooking, driving, ironing, painting, sewing, standing 1.3 men
1.3 women
Light Walking 3 MPH, electrical trades, sailing, golf, child care, housecleaning 1.6 men
1.3 women
Moderate Walking 3.5-4.0 MPH, weeding, cycling, skiing, tennis, dance 1.7 men
1.6 women
Heavy Manual digging, basketball, climbing, football, soccer 2.1 men
1.9 women
Exceptional  Training for professional athletic competition 2.4 men
2.2 women
 
 
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