Sunni Muslims and Shia Muslims comprise the two main sects within Islam. Because data on the percentages of Sunni and Shia Muslims are rough estimates in many countries, this study presents them as ranges. 57
Sunnis will continue to make up an overwhelming majority of Muslims in 2030. The number of Sunnis is projected to reach almost 2 billion by 2030 (between 1.91 billion and 1.97 billion), up from approximately 1.4 billion in 2010 (between 1.41 billion and 1.46 billion). Sunnis are expected to make up 87-90% of the world’s Muslims in 20 years, roughly the same percentage as today. The number of Shia Muslims is projected to be between 219 million and 285 million in 2030, up from between 162 million and 211 million in 2010. Shia Muslims are expected to make up 10-13% of the world’s Muslims, roughly the same percentage as today.
Within these ranges, however, there may be a very slight increase in the percentage of Sunni Muslims and a very slight decline in the percentage of Shia Muslims, largely because of low fertility in Iran, where more than a third of the world’s Shia Muslims live. The annual rates of growth for the world’s Sunni and Shia populations were identical from 1990 to 2000. But the rate of growth of the Shia population is expected to be slightly lower than the rate of growth for Sunnis over the next 20 years.
Four countries in the world have a Shia-majority population – Iran (where ~93% of Muslims are Shia), Azerbaijan (~70%), Bahrain (~70%) and Iraq (~67%). Of these, Iran has the largest number of Shia Muslims. Iraq’s Shia Muslim population is substantially smaller, but it is expected to grow at a faster rate than the Shia population in neighboring Iran.
The four countries with the largest Sunni-majority populations are Egypt (where ~99% of Muslims are Sunni), Indonesia (~99%), Bangladesh (~99%) and Pakistan (~87%). Of these, Pakistan is expected to have the greatest annual growth in its number of Sunni Muslims. Indonesia’s gains will be more modest.