Is there a ferry from Calais to st malo?

Answer 1

No.

But, there are roads leading there. And it is 515 km taking this route:

1. Take A16 ROUEN, from Calais, to A28 ROUEN at Exit 23.
2. Take A28 to A29 to LE HAVRE and CAEN at the split-off near Rouen.
3. Take A29 to A13 CAEN, past Le Havre.
4. Take A13 to the autoroute towards RENNES [blue sign], via the PÉRIPHÉRIQUE SUD, bypassing CAEN (EXIT 9 off the PÉRIPHÉRIQUE to get onto the autoroutetowards RENNES). You will be actually getting on autorouteA84 towards RENNES.
5. Take A84 to the route nationale [green sign] towards ST-MALO at Exit 34.
6. Take route nationale N176 to D137 to ST-MALO; EXIT onto D137.
7. Take D137 to St-Malo.