Yes there is a way.
All devices have a specified Tx output for different modes and speeds.
And Rx sensitivity is also specified in the device’s data sheet for different modes and speeds.
So, if you target e.g. MCS7 you find the numbers in the specs.
The same goes for the antennas.
And then you have all data needed for the wireless calculator.
If it states “Reliable”, then that particular mode will probably work.
You should also checkout this topic:
http://forum.mikrotik.com/t/wireless-product-max-distance/96823/1