4.55 or 910 I bought this as an office chair for my department and even though we’ve only had it one day moral is much higher, the seat is wider than expected and it feels very structurally strong, also the arms can go up or be down. The only thing it could improve is the chair leaning back just a little more, but the back is a very squishy mesh. Warning though you definitely need two people to assemble the chair, alone would be extremely difficult.