I-cubic meter (cbm) iyunithi yesilinganiso sevolumu esetshenziswa abathumeli ukunquma amanani esisindo. Isamba se-cbm (ngamamitha) singabalwa ngokuphindaphinda ubude (L), ububanzi (W), nobude (H) bephasela. Ngomthwalo oqukethe izinto ezinosayizi abahlukahlukene, phinda isibalo sosayizi ngamunye bese uhlanganise imiphumela. Ngokuvamile, kunezinhlobo ezintathu zefomula ye-cbm enkulu yezinhlobo ezintathu zamaphasela:
cbm ifomula yamaphasela avamile = L x W x H
Ifomula ye-cbm yamaphasela angajwayelekile = Yinde L x Mude Kakhulu W x Mude Kakhulu H
Ifomula ye-cbm yamaphasela ayisilinda = π x r² xh