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A view of the New Secretariat and State Bank of India buildings at night from across the Hooghly river

City Asia

Kolkata

Kolkata is a big city in India. It sits on a wide river. A giant steel bridge crosses the water.

Kolkata, once called Calcutta, is the capital of the Indian state of West Bengal, on the Hooghly River. It grew from a trading post started in 1690 and was the capital of British-ruled India until 1912. It built India's first underground metro in 1984, and the 2011 census counted 4,496,694 people in the city.

Kolkata, formerly Calcutta, capital of West Bengal, grew around a post founded by the English East India Company in 1690 beside the Hooghly. From 1773, as capital of Bengal, it oversaw all of the Company's possessions in India, and it served as the capital of British India until the capital moved to Delhi in 1912. The 2011 census counted 4,496,694 people within the Kolkata Municipal Corporation.

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Photo: DeepanjanGhosh, CC BY-SA 4.0, via Wikimedia Commons

Discover Kolkata

Kolkata is a big city in India. Long ago it was called Calcutta.

A wide river flows past it. At night, lights from tall buildings shine on the water.

Kolkata is the capital of West Bengal, a state in eastern India. It stretches along the Hooghly River. The city was once called Calcutta.

India's 2011 census, the latest one, counted 4,496,694 people in the city of Kolkata. Counted more widely, Kolkata is much bigger: UrbanRail.net, a guide to city railways, gives it more than 11 million inhabitants.

Kolkata is the capital of West Bengal, in eastern India, on the Hooghly River. Its core is the area governed by the Kolkata Municipal Corporation, which counted 4,496,694 residents in the 2011 census, India's latest; counted more widely, the city is far larger, and UrbanRail.net gives it more than 11 million inhabitants.

The Gran Enciclopèdia Catalana describes two historic parts: a European-built core around the Maidan, a great open space by the river where the government buildings of British times stand, and an older, densely built city to the north, which crowds most closely near the Hooghly at both ends of Howrah Bridge.

Country
India (capital of West Bengal)
People in the city (2011 census)
4,496,694
River
the Hooghly
Former name
Calcutta
A view of the New Secretariat and State Bank of India buildings at night from across the Hooghly river
Photo: DeepanjanGhosh, CC BY-SA 4.0, via Wikimedia Commons

A marble memorial, a steel bridge and a museum

Kolkata has a big memorial building made of marble. It stands in large gardens.

A giant steel bridge crosses the river. It joins the city to the other side.

The Victoria Memorial, a marble memorial to Queen Victoria built between 1906 and 1921, is one of Kolkata's most notable buildings. It stands where the Maidan, the city's open space by the river, meets Queen's Way, among 64 acres of gardens.

Howrah Bridge, which opened on 3 February 1943, joins Kolkata to Howrah across the Hooghly River. This steel bridge is 655.7 meters long and 85 meters high. The Indian Museum keeps treasures such as part of the railing of the ancient Bharhut stupa, from about 150 BC.

Among the city's buildings, the Gran Enciclopèdia Catalana singles out the Victoria Memorial (1921), a memorial to Queen Victoria built of Makrana marble, which stands among 64 acres of gardens where the Maidan meets Queen's Way. Howrah Bridge, opened on 3 February 1943, links the city center with the industrial district of Howrah across the Hooghly; Wikidata gives its length as 655.7 m and its height as 85 m.

The Indian Museum holds part of the balustrade of the Bharhut stupa (about 150 BC) and important collections of Greco-Buddhist, Gupta and post-Gupta sculpture. Across the river is Howrah railway station, and since 2024 a metro line has run beneath the Hooghly to reach it.

Victoria Memorial
1921
Howrah Bridge opened
3 February 1943
Howrah Bridge length
655.7 m
A view of the New Secretariat and State Bank of India buildings at night from across the Hooghly river
Photo: DeepanjanGhosh, CC BY-SA 4.0, via Wikimedia Commons

From a trading post to a capital

Long ago, traders from England came to a village by the river. They built a fort and a town grew around it.

For many years, the British ruled India from Kolkata.

In 1690, the English East India Company, a trading company, set up a post beside the Hooghly near a village called Calcutta, which had been mentioned in records as early as 1596. In 1696 the Company built Fort William there.

From 1773 Calcutta was the capital of Bengal and the seat from which the Company ran its lands in India, and later it was the capital of all of British-ruled India, until the capital moved to Delhi in 1912. When India became independent in 1947, Calcutta became the capital of the state of West Bengal.

The Gran Enciclopèdia Catalana dates the city's founding to 1690, when the English East India Company settled near the village of Calcutta, recorded as early as 1596, and built Fort William in 1696. From 1773 Calcutta, as capital of Bengal, oversaw all of the Company's possessions in India, and from 1834 the governor of Bengal became governor-general of India.

Calcutta remained the capital of British India until 1912, when the capital moved to Delhi. From 1930 the city was deeply involved in the struggle for independence, and when Bengal was divided on 15 August 1947, Calcutta became the capital of the Indian state of West Bengal. Today the city's official name is Kolkata.

Founded by the English East India Company
1690
Fort William built
1696
Capital of British India until
1912 (moved to Delhi)
A view of the New Secretariat and State Bank of India buildings at night from across the Hooghly river
Photo: DeepanjanGhosh, CC BY-SA 4.0, via Wikimedia Commons

Through the years

India's first metro, and trains under the river

Kolkata had the first underground train in India. It opened a long time ago.

Now some trains even run in a tunnel under the river!

The Kolkata Metro was the first underground railway in India. Building began in 1973, and the first 3.4-kilometer section opened on 24 October 1984, between Esplanade and Bhowanipur. The north-south line kept growing for many years.

A newer east-west line, the Green Line, goes under the Hooghly River between the city and Howrah railway station. Its river section opened in 2024, and since 22 August 2025 trains have run along the whole line. People also cross the river on Howrah Bridge.

A 1971 master plan proposed five rapid transit lines, of which the north-south route was considered most important. Built mainly by cut-and-cover from 1973, its first section, Esplanade to Bhowanipur (now Netaji Bhaban), opened on 24 October 1984 as India's first subway line; by 1995 the line was 16.5 km long with 17 stations, and later extensions have taken it north to Dakshineswar (2021) and south on an elevated route.

The east-west Green Line, built from 2009, uses standard gauge, air-conditioned trains and platform screen doors. Between Mahakaran and Howrah station it runs beneath the Hooghly; the Howrah Maidan–Esplanade section opened on 6 March 2024, and the Esplanade–Sealdah link of 22 August 2025 allowed through service along the whole line.

First metro section opened
24 October 1984, Esplanade to Bhowanipur (3.4 km)
First subway line in India
the Kolkata Metro
Green Line runs under the Hooghly
Howrah Maidan to Esplanade from 6 March 2024
A view of the New Secretariat and State Bank of India buildings at night from across the Hooghly river
Photo: DeepanjanGhosh, CC BY-SA 4.0, via Wikimedia Commons

Hot spring, rainy monsoon and a cool winter

Spring in Kolkata is very hot. Then the summer rains come, and lots of rain falls for months.

Winter is mild and dry, with cool nights.

Kolkata's year has three moods. April and May are the hottest months, with average days of about 35 to 36 °C. From June to September the monsoon rains arrive, with about 280 to 340 millimeters in each of these months.

Winter, from December to February, is dry and mild, with days of about 26 to 29 °C and nights of about 14 to 17 °C. The World Meteorological Organization's long-term averages add up to about 1,650 millimeters of rain a year.

WMO averages for Kolkata, based on 1901–2000, show average highs peaking at 35.7 °C in April and 35.5 °C in May, before the monsoon; January is the coolest month, at 26.0 °C by day and 13.7 °C at night.

The monthly rainfall averages sum to about 1,651 mm, and the monsoon months dominate: 282.4 mm in June, 339.8 mm in July, 333.2 mm in August and 277.2 mm in September, together about three-quarters of the year's total. December, with 6.4 mm, and January, with 13.3 mm, are the driest.

April, average daily high (WMO, 1901–2000)
35.7 °C
January, average daily high and low
26.0 °C and 13.7 °C
Rain in a year (sum of the monthly averages)
about 1,650 mm

A city of poets, universities and open spaces

A famous poet named Rabindranath Tagore was born in Kolkata. He won a big prize for his poems.

The city has an open space by the river, called the Maidan.

The poet Rabindranath Tagore was born in Calcutta in 1861. In 1913 he won the Nobel Prize in Literature for his poems, which he also put into English himself. In 1901 he started a school in Shantiniketan that mixed Indian and Western ideas.

Kolkata is a city of learning: the University of Calcutta was founded in 1857, and Jadavpur University in 1955. Beside the river lies the Maidan, an open space in the city.

Rabindranath Tagore, born in Calcutta on 7 May 1861, won the 1913 Nobel Prize in Literature for verse that, in the words of the prize citation, he had made "a part of the literature of the West" in his own English words. After studying in England in the late 1870s he returned to India, published poetry from the 1880s, and in 1901 founded an experimental school at Shantiniketan blending Indian and Western traditions; he died in Calcutta in 1941.

The city is a long-standing center of higher education: the University of Calcutta dates from 1857, Jadavpur University from 1955 and Rabindra Bharati University from 1962. The Maidan, the open space by the river, has the British-era government buildings around it and the older city to its north.

Rabindranath Tagore
born in Calcutta, 7 May 1861; Nobel Prize in Literature 1913
University of Calcutta
founded 1857
The Maidan
an open space beside the river
A view of the New Secretariat and State Bank of India buildings at night from across the Hooghly river
Photo: DeepanjanGhosh, CC BY-SA 4.0, via Wikimedia Commons

Kolkata on the map

Find Kolkata on the globe.

It is in India, in Asia. Look in the east of India, by a river.

Kolkata is in eastern India, in the state of West Bengal, on the Hooghly River. Howrah lies across the river to the west, joined to the city by Howrah Bridge.

Kolkata is at about 22.5 degrees north of the Equator. The country of Bangladesh lies to its east.

Kolkata lies at about 22.5° N and 88.3° E, on the east bank of the Hooghly in West Bengal. Howrah, with its great railway station, lies on the opposite bank, linked by Howrah Bridge and, since 2024, by the Green Line under the river.

Bangladesh lies to the east.

Latitude
about 22.5° north
Longitude
about 88.3° east
State
West Bengal, in eastern India

Amazing facts

  • Kolkata had the very first underground train in India.

    The Kolkata Metro's first section opened on 24 October 1984. It was the first subway line in India.

    Planned in 1971 and built mainly by cut-and-cover from 1973, the Kolkata Metro opened its first 3.4 km on 24 October 1984 as India's first subway line.

  • Some trains in Kolkata travel under a river!

    The Green Line runs in a tunnel under the Hooghly River between Kolkata and Howrah railway station.

    Between Mahakaran and Howrah station the Green Line runs beneath the Hooghly; its Howrah Maidan–Esplanade section opened on 6 March 2024.

  • A famous poet who won a Nobel Prize was born in Kolkata.

    Rabindranath Tagore, born in Calcutta in 1861, won the Nobel Prize in Literature in 1913.

    Rabindranath Tagore was born in Calcutta on 7 May 1861 and died there on 7 August 1941; he received the 1913 Nobel Prize in Literature.

  • Kolkata's giant steel bridge is more than 600 meters long.

    Howrah Bridge, opened in 1943, is 655.7 meters long and 85 meters high.

    Howrah Bridge, opened on 3 February 1943, is 655.7 m long and 85 m high, according to Wikidata.

Words to know

trading post
a place set up by traders to buy and sell goods far from home
monsoon
a wind that changes with the seasons and brings a long rainy season
metro
a city railway, often running underground
census
an official count of all the people in a country
memorial
a building or monument made to remember a person or event
delta
flat land at the mouth of a river, where it splits into smaller channels

Discovery challenge

  1. Kolkata is a city in which country?

    Kolkata is the capital of a state in which country?

    Kolkata is the capital of West Bengal, a state of which country?

    • Bangladesh
    • India
    • Nepal
    Show the answer

    India

    India! Kolkata is in the east of India.

    India. Kolkata is the capital of West Bengal.

    India; Kolkata has been West Bengal's capital since 1947.

  2. What was Kolkata's old name?

    What was Kolkata called before?

    By what name was Kolkata known when it was the capital of British India?

    • Calcutta
    • Bombay
    • Madras
    Show the answer

    Calcutta

    Calcutta!

    Calcutta, the name of the village near the first trading post.

    Calcutta, capital of British India until 1912.

  3. What did Kolkata build first in India?

    In 1984, Kolkata opened India's first what?

    What opened on 24 October 1984 between Esplanade and Bhowanipur?

    • Airport
    • Underground metro
    • Space center
    Show the answer

    Underground metro

    An underground train!

    An underground metro line.

    The first 3.4 km of the Kolkata Metro, India's first subway line.

  4. Which river flows past Kolkata?

    Kolkata stretches along which river?

    Which river, crossed by Howrah Bridge and tunneled under by the Green Line, flows past Kolkata?

    • The Indus
    • The Hooghly
    • The Mekong
    Show the answer

    The Hooghly

    The Hooghly! A big bridge crosses it.

    The Hooghly, which flows past the city center.

    The Hooghly, which separates Kolkata from Howrah.

  5. When does most rain fall in Kolkata?

    In which season does Kolkata get most of its rain?

    In which months does Kolkata receive about three-quarters of its yearly rainfall?

    • December to February
    • June to September
    • March and April
    Show the answer

    June to September

    In summer, from June to September.

    In the monsoon season, from June to September.

    June to September: 282.4, 339.8, 333.2 and 277.2 mm in WMO's averages.

Nearby places

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For parents & teachers

What children will learn

  • Locate Kolkata on the Hooghly River in eastern India.
  • Explain how a trading post grew into a capital city.
  • Describe how a monsoon climate shapes the year in a city.
  • Name Rabindranath Tagore as a poet born in Kolkata who won the Nobel Prize.

Recommended ages: 3 to 17 · About 15 minutes

Talk about it

  • Kolkata grew from a small trading post. Why do you think trading posts were often built beside rivers?
  • Kolkata gets most of its rain in four months. How would that change what people do during the year?
  • Tagore started a school that mixed ideas from different places. What would you put in a school that mixes ideas from around the world?

Try at home or in class

  • Monsoon chart: draw twelve columns for the months and color in Kolkata's rainfall to scale (1 cm for every 20 mm), then compare it with your town's rain.
  • Paper bridge: fold strips of card into beams and build a bridge between two books, then test how many coins it can hold.
  • Write a short poem about a river near you, the way Tagore wrote about the world around him.

Key vocabulary: trading post, monsoon, metro, census, memorial, delta

Where these facts come from

  1. Wikidata , Wikimedia Foundation (CC0 1.0)
  2. Natural Earth vector data , Natural Earth (NACIS) (Public domain)
  3. Calcuta , Gran Enciclopèdia Catalana
  4. Kolkata (Calcutta) Metro , UrbanRail.Net
  5. Rabindranath Tagore: Facts , NobelPrize.org (Nobel Prize Outreach)
  6. Kolkata: climatological information , World Meteorological Organization, World Weather Information Service
  7. Victoria Memorial , Incredible India (Ministry of Tourism, Government of India)
  8. Wikimedia Commons , Wikimedia Foundation (Per file (public domain, CC0, CC BY or CC BY-SA); see each media record)

Checked, not yet human-reviewed. Last updated November 1, 2026. Spotted a mistake? Tell us.

Picture credits
  • Photo: DeepanjanGhosh, CC BY-SA 4.0, via Wikimedia Commons · source · license