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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:

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TFR =  B x
x 15= W x

Where:
TFR: Total fertility rate (children per woman);

Bx: Number of live births registered in the year of women aged (x);
x : One-year age interval;

Wx: 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:
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TFR 5=   B i
i 1= W i

Where:

TFR: Total fertility rate;
Bi: Number of live births in the reference period of women in the age
group (i);
th
i: i age group;
th
Wi: Number of women of the i age group up to the reference time-point.
The coefficient of 5 in the above formula is applied for the average
rate of consecutive 5-year age groups so that the TFR will be commensurate
with the age-specific fertility rates described in this formula.
Crude death rate
Crude death rate indicates that for every 1,000 people, how many
deaths are in the reference period.

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