The planned Terafab factory is expected to stretch roughly 2.5 miles in length , based on its announced floor area and preliminary descriptions. However, that figure isn’t an officially confirmed physical dimension, and some unofficial estimates have described a footprint closer to four miles long by one mile wide.
What’s confirmed
Tesla and SpaceX have announced plans for a Terafab semiconductor complex in Grimes County, Texas, with more than 100 million square feet of manufacturing space once fully built. That would make it one of the largest buildings ever planned, far exceeding facilities such as Tesla’s Giga Texas.
The 2.5-mile estimate comes from interpreting the proposed floor area as a largely rectangular building. A factory of that size could have a different shape, multiple connected structures, or separate production blocks, so its final end-to-end length may change.
Why estimates vary
Early illustrations and commentary have used different measurements. One widely shared estimate described the building as approximately four miles long and one mile wide , but that figure has not been established as an official specification.
The project is also planned as a four-phase development , rather than a single structure completed on one opening day. The first phase is expected to require more than $16.8 billion, while the full complex would be built out over several stages.
So, the safest answer is: about 2.5 miles long by current published estimates, with the final dimensions still uncertain.