The unofficial SkyMiles calculator does not provide current RDM by dollars spent calculation.

What you should do is use it because it accurately gives you the MQM. Assuming you are buying a coach fare that won't earn more than 100% MQMs flown, then multiply the MQM total by the RDM/MQD percentage number listed in the AF marketed table, for the fare class you are intending to purchase. This will accurately give you the MQD and RDM numbers.