If you're needing to find out how much that online purchase will be on your credit 
Card OR whether you should use the site's converter (Amazon, Newegg, Paypal, etc) vs your credit card's to save a few dollars.

Here's the site to use:
https://usa.visa.com/support/consumer/travel-support/exchange-rate-calculator.html


<sortable>
^ Bank ^ Stated Fee (%) ^ Charged Range* (%)^
| ANZ| | |
| ASB|2.1 | 2.1|
| BNZ| 5 | 2.25-5|
| KiwiBank| | | 
</sortable>

*Charged range is what you or other have worked out was actually charged on transactions