Schoenus calcatus is a species of Cyperaceae endemic to Western Australia.

[2] S. calcatus is a small cushion-forming perennial.

The leaves are spirally arranged and have both a short blade and a short sheath.

[3] Schoenus calcatus was first described in 1997 by Karen Wilson.

[2] The specific epithet calcatus, is derived from the Latin verb, calcare, 'to tread upon' or 'walk over' and refers to a potential threat to the species.