Ruutkilomeeter (tähis km²; kasutatud ka qkm) on pindalaühik, mis võrdub 1 000 000 ruutmeetriga:
- 1 km2 = 1000 × 1000 m = 1 000 000 m2.
Üheruutkilomeetrine pindala on ruudul, mille külje pikkus on 1 kilomeeter.
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