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Where:

CBR: Crude birth rate;

B: Total live births in the reference period (total of children were born
alive in the reference period);

P tb: Population up to the reference time-point.

Total fertility rate (TFR)

Total fertility rate reflects the average number of live births that would be
born per woman during the childbirth period if the woman passes age-specific
fertility rates observed in a given reference period during the reproductive
period.
Formula by age group:

49
TFR   B x

x 15 W x
Where:

TFR: Total fertility rate (children per woman);
B x: Number of live births registered in the year of women aged (x);

x : One-year age interval;

W x: Number of women aged (x) at the calculation mid-year.

Age specific fertility rates are accumulated from x = 15 to x = 49.

In fact, the total fertility rate is calculated by the abridged method. In case
the age specific fertility rates are calculated for 5-year age groups, index of
(i) represents the 5-years interval of age, such as 15-19, 20-24, ..., 45-49.

Formula by 5-year interval of age:

7 B
TFR  5   i

i 1 W i
Where:

TFR: Total fertility rate;

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