The Treaty formally concluded the Polish-Teutonic War which began in 1326/1327. It put an end to the long-running diplomatic clashes over Pomerelia including Gdańsk that ensued the War, an area that the Teutonic Order had in its possession since 1308, and which it viewed as its legal property since the conclusion of the Treaty of Soldin (1309) with the Margraves of Brandenburg. In the Treaty of Kalisz, King Casimir III, undertook in the future to raise no claims on Pomerelia as well as Chełmno Land and Michałów Land. In exchange, King Casimir III regained Kuyavia and Dobrzyń Land, which had been conquered by the Teutonic Order between 1329 and 1332. The peace agreement also confirmed seven cities: Poznań and Kalisz in Greater Poland, Włocławek and Brześć Kujawski in Kuyavia, as well as Kraków, Sandomierz and Nowy Sącz in Lesser Poland.

As a result, while Pomerelia remained a subject of contention, the treaty was followed by 66 years of peace between the Kingdom of Poland and the Teutonic Order, until the conflict erupted again in the Polish–Lithuanian–Teutonic War of 1409.