Karaikal's economy has historically relied on agriculture and marine fishing, but it has diversified significantly in the 21st century. The establishment of the MARG Karaikal Port, an all-weather, deep-water port, has been a major catalyst for economic growth, transforming the city into a logistics hub for coal, fertilizer, and cement for the central Tamil Nadu region.
Tourism is another robust pillar of the economy, largely driven by religious pilgrimage to the Thirunallar temple, which brings a steady flow of domestic tourists. The cost of living in Karaikal is generally moderate and more affordable compared to major South Indian cities like Chennai or Bangalore. Local retail, hospitality, and state government employment also constitute significant portions of the local economy.