Don't need a complex online calculator. The old Casio from high school will do the job. Just multiply the percentage moves together, but negate and reciprocal the FX move first, as USD needs to be the base currency but by market convention it's quoted as AUD/USD.
Eg. If the ETF holds $100B USD worth of underlying and AUD/USD is 0.65, it holds ~$153.85B AUD. Then the ETF rallies by 5% but AUD/USD also rises to 0.67. This is a (0.67-0.65)/0.65 = 3.08% rise in AUD but a ((1/0.67)-(1/0.65))/(1/0.65) = 3% fall in USD/AUD, so 1.05 * (1-0.03) = ~1.85% gain in AUD terms. So the next day it holds $105B / 0.67 = ~$156.72B AUD, which is 1.85% higher than $153.85B.
The market prices may not reflect this exactly due to fluctuation, but they will be close (compare IVV vs IHVV for example, they hold the same underlying assets but the latter is hedged, the former isn't). The difference in the daily moves between the two will usually be very close to the FX movement between 4 pm the previous day to the time of observation.