Sydney University expects a $470 million loss due to the COVID-19 crisis this year, thanks to a 17 per cent drop in international students, fewer than expected domestic students, and the extra cost of online teaching.

In an email to staff on Wednesday, vice-chancellor Michael Spence said the university's census on March 31 - the last date for students to change their enrolment - clarified its financial position.

It showed a total of 9.9 per cent fewer students than the university had planned for in 2020, including 4.8 per cent fewer domestic students and 16.8 per cent fewer international students, "which has significant revenue implications," he said.

Sydney University expects a $470 million hit to its bottom line as a result of COVID-19. Credit:Louise Kennerley

The university was assessing what that meant for its financial position, taking into account the expected hit to second semester domestic and international enrolments, and extra costs related to COVID-19.