What is the natural sex ratio at birth?

The biologically normal SRB is 103–107 males per 100 females. Higher ratios (108+) in countries like China, India, and parts of the Caucasus have been attributed to son preference and sex-selective abortion.

Who coined 'missing women'?

Amartya Sen coined the term 'missing women' in 1990 to describe the demographic deficit of women in countries with son preference. Current estimates put the number of 'missing' women at 90–140 million globally.

Sex Ratio at Birth Calculator

Calculate sex ratio at birth (SRB) as the number of male births per 100 female births. The natural SRB is approximately 105–107. Deviations above 108 may indicate sex-selective practices.

Data set — comma or newline separated

Statistical Results — n = 8

Count (n)8

Sum (Σx)40

Min2

Max9

Range7

Q14

Q35.5

IQR1.5

Mean (μ)5

Median4.5

Mode4

Pop. Variance (σ²)4

Pop. Std Dev (σ)2

Sample Variance (s²)4.571428571

Sample Std Dev (s)2.138089935

Skewness0.65625

Excess Kurtosis-0.21875

How to Use

Enter the values for the scenario you are assessing. Calculate sex ratio at birth (SRB) as the number of male births per 100 female births. The natural SRB is approximately 105–107. Deviations above 108 may indicate sex-selective practices. Use the sex ratio at birth result to inform your calculation.

Sex Ratio at Birth Calculator

How to Use

Frequently Asked Questions

What is the natural sex ratio at birth?

Who coined 'missing women'?