Millfield is predominantly a boarding school with around 80% of its pupils as full or weekly boarders.

Both choristers and probationers are full boarders.

Most sixth formers are full boarders while day girls are welcome to board on an ad hoc basis.

Both weekly boarders (Monday - Friday) and full boarders are accepted.

Forty-three per cent are full or weekly boarders.

That is for a full boarder.

Around half are full boarders who go home at weekends and for holidays.

Choristers are full boarders while other boys return home for the weekend.

The school charges about $15500 NZD as school fees for a full boarder per year.

It caters for both weekly and full boarders, having a maximum capacity of 82 boys from Year 9 - 13.