How much did the space race cost?

Project Apollo remains the benchmark. NASA reported a cumulative cost of about 25.4 billion dollars to Congress in 1973, covering the Saturn launch vehicles, the command and lunar modules, ground facilities and operations. Adjusted for inflation, the Planetary Society puts that at roughly 257 billion dollars in 2020 terms, or close to 280 billion if the earlier Mercury and Gemini programmes and the robotic lunar probes are folded in. At its peak in 1965 and 1966, NASA consumed more than 4 percent of the entire federal budget, a share it has never approached since.

Moscow never published a consolidated figure. Its lunar effort was split among rival design bureaus, funded through military budgets and priced in a non-convertible rouble, so Western analysts could only estimate. Russian documents released after 1991 suggest the N1-L3 moon programme alone absorbed several billion roubles before it was cancelled in 1974 after four failed N1 launches, but converting that into comparable dollars is guesswork rather than accounting.

The spending produced far more than footprints on the Moon. It built the Kennedy Space Center, the Deep Space Network, the Houston control complex and a generation of engineers, and it drove advances in integrated circuits, materials and systems management that spread across industry. Measured against the federal budget of the 1960s, it was a large but time-limited investment: the annual peak was reached in 1966 and spending fell steadily as the lunar landings were completed, which is why historians tend to describe Apollo as a political instrument that the country could afford rather than an economic sacrifice.