The Louisiana Purchase cost the United States $15 million in 1803, paid to France for about 828,000 square miles of territory.

Quick Scoop

  • The U.S. agreed to pay $15 million total for the Louisiana Territory.
  • That worked out to roughly 4 cents per acre , an extremely low price even by early 19th‑century standards.
  • In modern terms, historians estimate that $15 million in 1803 is roughly $340–380 million today , depending on the inflation method used.

A Bit More Detail

  • The purchase was finalized in 1803 between the United States and France under President Thomas Jefferson and First Consul Napoleon Bonaparte.
  • The deal nearly doubled the size of the United States, adding land that would later become all or part of multiple central and western states.

Cost Breakdown

  • Nominal price: $15,000,000 (about 3% of the U.S. federal budget at the time).
  • Land area: approximately 828,000 square miles (around 530 million acres).
  • Implied rate: about 3–4 cents per acre , depending on the exact acreage figure used.

In short, when people ask “how much was the Louisiana Purchase?” the historically correct headline figure is $15 million —a sum now seen as one of the biggest land bargains in U.S. history.

TL;DR: The Louisiana Purchase cost $15 million in 1803, roughly a few hundred million dollars in today’s money, for land that nearly doubled the size of the United States.

Information gathered from public forums or data available on the internet and portrayed here.