The school's student council, enviro-schools committee and Queen's Action Committee (Quack) scoured the school's rubbish receptacles on Thursday, collecting and weighing the contents, as part of World Environment Day which is celebrated today.
Quack member Hannah Davidson said the groups counted 1280 pieces of packaging, nearly 300 pieces of cling film and a large quantity of half-eaten or uneaten food.
The grand total was about 80kg of refuse, she said.
"It was quite disgusting sorting through all the rubbish.
"I was amazed to see what we actually throw out in a day - especially the 1280 pieces of unnecessary lunch packaging and the amount of uneaten food."
If the school was open every day for a year, it would generate 28 tonnes of rubbish, which is equivalent to 53kg for each person in the school, she said.
To put it in perspective, it was equivalent to every person in the school throwing out one pupil every year, she said.
It was a "smelly and yucky" job, but Hannah believed it highlighted the large amounts of unnecessary refuse created by the school in a single day.
"Of that 80kg, we think 70kg could be recycled.
"Every little bit does make a difference," she said.
The school hopes to repeat the audit again in term 3 and compare the results. It was hoped there would be a lot less refuse, she said.
