The historical and modern estimates of attendance vary greatly between sources.
For example, the colonial era Imperial Gazetteer of India reported that between 2 and 2.5 million pilgrims attended the Kumbh mela in 1796 and 1808, then added these numbers may be exaggerations.
Between 1892 and 1908, in an era of major famines, cholera and plague epidemics in British India, the pilgrimage dropped to between 300,000 and 400,000.

During World War II, the colonial government banned the Kumbh Mela to conserve scarce supplies of fuel.
The ban, coupled with false rumours that Japan planned to bomb and commit genocide at the Kumbh mela site, led to sharply lower attendance at the 1942 Kumbh mela than prior decades when an estimated 2 to 4 million pilgrims gathered at each Kumbh mela.
After India's independence, the attendance rose sharply.
On amavasya – one of the three key bathing dates, over 5 million attended the 1954 Kumbh, about 10 million attended the 1977 Kumbh while the 1989 Kumbh attracted about 15 million.

On 14 April 1998, 10 million pilgrims attended the Kumb Mela at Haridwar on the busiest single day, according to the Himalayan Academy editors.
In 2001, IKONOS satellite images confirmed a very large human gathering, with officials estimating 70 million people over the festival, including more than 40 million on the busiest single day according to BBC News.
Another estimate states that about 30 million attended the 2001 Kumbh mela on the busiest mauni amavasya day alone.

In 2007, 70 million pilgrims attended the 45-day long Ardha Kumbh Mela at Allahabad, estimates the local administration.
In 2013, 120 million pilgrims attended the Kumbh Mela at Allahabad.
Nasik has registered maximum visitors to 75 million.

Maha Kumbh at Allahabad is the largest in the world, the attendance and scale of preparation of which keeps rising with each successive celebration.
For the 2019 Ardh Kumbh at Allahabad, the preparations include a ₹42,000 million (US$590 million or €540 million) temporary city over 2,500 hectares with 122,000 temporary toilets and range of accommodation from simple dormitory tents to 5-star tents, 800 special trains by the Indian Railway, artificially intelligent video surveillance and analytics by IBM, disease surveillance, river transport management by Inland Waterways Authority of India, and an app to help the visitors.

The Kumbh mela is "widely regarded as the world's largest religious gathering", states James Lochtefeld.
According to Kama Maclean, the coordinators and attendees themselves state that a part of the glory of the Kumbh festival is in that "feeling of brotherhood and love" where millions peacefully gather on the river banks in harmony and a sense of shared heritage.
The historical and modern estimates of attendance vary greatly between sources. For example, the colonial era Imperial Gazetteer of India reported that between 2 and 2.5 million pilgrims attended the Kumbh mela in 1796 and 1808, then added these numbers may be exaggerations. Between 1892 and 1908, in an era of major famines, cholera and plague epidemics in British India, the pilgrimage dropped to between 300,000 and 400,000.
During World War II, the colonial government banned the Kumbh Mela to conserve scarce supplies of fuel. The ban, coupled with false rumours that Japan planned to bomb and commit genocide at the Kumbh mela site, led to sharply lower attendance at the 1942 Kumbh mela than prior decades when an estimated 2 to 4 million pilgrims gathered at each Kumbh mela. After India's independence, the attendance rose sharply. On amavasya – one of the three key bathing dates, over 5 million attended the 1954 Kumbh, about 10 million attended the 1977 Kumbh while the 1989 Kumbh attracted about 15 million.
On 14 April 1998, 10 million pilgrims attended the Kumb Mela at Haridwar on the busiest single day, according to the Himalayan Academy editors. In 2001, IKONOS satellite images confirmed a very large human gathering, with officials estimating 70 million people over the festival, including more than 40 million on the busiest single day according to BBC News. Another estimate states that about 30 million attended the 2001 Kumbh mela on the busiest mauni amavasya day alone.
In 2007, 70 million pilgrims attended the 45-day long Ardha Kumbh Mela at Allahabad, estimates the local administration. In 2013, 120 million pilgrims attended the Kumbh Mela at Allahabad. Nasik has registered maximum visitors to 75 million.
Maha Kumbh at Allahabad is the largest in the world, the attendance and scale of preparation of which keeps rising with each successive celebration. For the 2019 Ardh Kumbh at Allahabad, the preparations include a ₹42,000 million (US$590 million or €540 million) temporary city over 2,500 hectares with 122,000 temporary toilets and range of accommodation from simple dormitory tents to 5-star tents, 800 special trains by the Indian Railway, artificially intelligent video surveillance and analytics by IBM, disease surveillance, river transport management by Inland Waterways Authority of India, and an app to help the visitors.
The Kumbh mela is "widely regarded as the world's largest religious gathering", states James Lochtefeld. According to Kama Maclean, the coordinators and attendees themselves state that a part of the glory of the Kumbh festival is in that "feeling of brotherhood and love" where millions peacefully gather on the river banks in harmony and a sense of shared heritage.
Kumbh Mela