In sp hybrid orbitals (composed of one s and one p orbital), the s character makes up 50% and the p character makes up 50%. In sp2 hybrid orbitals (composed of one s and two p orbitals), the s character makes up 33% and the p characters make up 66%. In sp3 hybrid orbitals (formed by one s and three p orbitals), the s character makes up 25% and the p character makes up 75%.