The Civilization 6 interface apparently doesn't provide any information on why or how borders grow. I assume its culture with modifiers because that was how it was in Civ 5 and Civ 4, but I have no idea if the formula is the same as Civ 5 or what might affect it.

The only quote I could find in the manual says:

The more Culture you generate, the faster your borders will grow

Does anyone know the formula for border growth in Civ 6?

A side question: Are culture producing buildings and districts the best way to have natural border growth (i.e. not purchased)?

  • 2
    Perhaps user @Ace would know? They made a mod that provides number of turns until border growth and shows a preview.
    – pushasha
    Nov 3, 2016 at 17:04

1 Answer 1


Based on multiple posts in this thread, it looks like the border expansion formula has been found in the XML files:

  1. tiles are obtained with culture produced by the city
  2. the culture cost of a tile is 10+(6*n)^1.3 (where n is the number of tiles obtained by culture already...not sure if gold bought ones count)

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