World Size Calculator

For square worlds, "radius" actually refers to the apothem: the distance from the center to the midpoint of a side, or half the side length, not the distance to a corner. Most world-generation tools call this a radius, so this calculator uses the same terminology.

Area is divided by 256 blocks per chunk and multiplied by a fixed per-chunk coefficient. Circular areas use pi / 4 of the corresponding square. Boundary chunks are approximated. Sizes use binary units: 1 GiB = 1,073,741,824 bytes.

Current 26.1.2 coefficients, interpreted as KiB per chunk: Overworld 9.82, Nether 6.42, End 4.31.

Actual storage varies with terrain, compression, server software, and world activity. Backups, plugins, player data, and future growth are not separately modeled. Headroom is a planning allowance, not a guaranteed upper bound.