In 1918 Fredriksskans was opened and at the same time the where a major conference in Kalmar about the high number of clubs in the town, this led to the merging of IF Gothia and Kamraterna to Kalmar Idrotts Sällskap and Kalmar IK merged with Falken to form Kalmar AIK. In 1927 Kalmar Idrotts Sällskap changed its name to Kalmar FF.

In 2004 the club bought three new Brazilian players, Dedé Anderson, Fábio Augusto and Cesar Santin, they all helped the club to a 5th place in Allsvenskan, just missing out on Royal League, the club also made a change board as chairman Ronny Nilsson left after 12 years at the helm, he was replaced by Tommy Strandman.

In 1988 Kalmar FF won Division 2 without a single defeat which is a record in Division 2 and higher leagues. Between 1989 and 1997 the club spent most of its time in second highest league; this caused serious economic problems for the club.

In 1981 the club won its first title ever, by defeating IF Elfsborg with 4–0, the club won the Svenska Cupen for the first time ever, however they failed to stay in Allsvenskan and was relegated to Division 1; however the spell was only one year long and Kalmar returned in 1983.

In 2011 Guldfågeln Arena was initiated. It is the new stadium of the football team of the city, Kalmar FF. The capacity of the stadium is 12,000 people and it is currently one of the newest stadiums in Sweden. The stadium was also built to host concerts and did so in the summer of 2011 when Swedish artists Håkan Hellström and The Ark performed.

Kalmar has a cold oceanic climate.[4] It is somewhat continental with warm summers and cold winters which normally averages just above the freezing point during days and goes somewhat below it at night. It has some of the hottest temperatures recorded by Swedish cities for most months, with an all-time record of 35.2 °C (95.4 °F).[5] The average summer temperatures however are quite normal for southern Sweden.

After returning to Allsvenskan in 1998, but in 1999 the club fell out again, the only good thing was that the economy had been restored and was in good shape again. During the 2000 season club had to fight to avoid relegation from the second highest league and was only able to do it in the end of the season.

The two following seasons, 2005 and 2006, Kalmar ended up in 3rd and 5th respectively. Then in 2007 they made a great run from start to finish and finally ended up in second place after champions IFK Göteborg. They won Svenska Cupen the same year by beating IFK Göteborg with 3–0 at Fredriksskans in Kalmar.

Bicycle lanes are common; for example, the Kalmarsundsleden,[3] and cars line up at Kalmar city's public biogas pump. Building codes now require thermal insulation and efficient windows for new construction or retrofits. Street lights use low-energy sodium bulbs, and car dealers promote fuel-efficient and hybrid vehicles.[2]

On 15 June 1910, the club IF Göta was created, however they were not allowed to enter the Riksidrottsförbundet due to a conflict regarding the name. The name was already taken by Stockholm's-Göta and Karlstads-Göta. Later in 1912 the club changed its name to IF Gothia and was then accepted by Riksidrottsförbundet.

Kalmar became a diocese in 1603, a position it held until 1915. In 1634, Kalmar County was founded, with Kalmar as the natural capital. In 1660, the Kalmar Cathedral was begun by drawings of Nicodemus Tessin the Elder. It would be inaugurated in 1703.

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Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

The goal of the 2001 season was to return to Allsvenskan again, after buying several new players such as Lasse Johansson, Fredrik Gärdeman and Lucas Nilsson, the club was able to return to Allsvenskan again, unfortunately the club was relegated directly. During the 2002 the first Brazilian, Alysson, arrived at the club.

In 1927–1928 they qualified for the local league in the Swedish league system, IFK Oskarshamn won the league and was moved up to the Southswedish league, covering both Småland and Skåne, however IFK Oskarshamn renounce its position and it was given to Kalmar FF, this gave rise to complaint from the clubs in Skåne since there were no good train connections to Kalmar at that time, however SJ solved it. In their first game they defeated KIS Malmö FF with 6–0.

1985 became the club's most successful season, as the club ended up in second place behind Örgryte IS and Billy Lansdowne and Peter Karlsson both became the league's top goalscorer along with Sören Börjesson, Örgryte IS, all scoring 10 goals each. The following year did not go as good; the club was relegated from the top league and the only happiness in 1987 was when the club yet again won the Cup title, this time against GAIS, however the club fell out of Division 1 this year.

The spell in Superettan 2003 became only one year as Kalmar won the league well ahead of Trelleborgs FF, purchase of Daniel Mendes and Dudu helped the club a lot.

In 1976 the club played its 100th game in Allsvenskan against GIF Sundsvall, however this ended with 9–2 defeat and led to manager Kay Wiestål being fired. The 1977 season became the club's most successful season so far; a group of companies sponsored the club's buying of Benno Magnusson; the club was able to end in 3rd place at the end of the season, earning the club its first medal.