Please use this sheet to calculate your overload; note that only the yellow cells can be modified. You will need to sign into your Microsoft 365 account in order to open the file.
Tested on Chrome and Firefox (regular, not incognito/private/guest mode); apologies that the web developer did not have a chance to test with other browsers.
If you don’t have a Microsoft 365 account, you can also download the original Excel file below and it should make the same calculations. Regardless of what method you use, always confirm the numbers with your FO/FA.