If Renoah's driving on that route, remind me to stay well clear!
Eurostar takes about an hour and a half from Calais to Paris. OK, there's a very slight detour via Lille but It does travel at 300 km/h (=186 mph) for most of the journey. If Renoah thinks he/she can match that in a car, I definitely don't want to be on the same stretch of road as him/her.
ViaMichelin quotes the distance as 296km (184 miles), with nearly all of that distance (289km = 180 miles) being on motorways. The motorway tolls add up to 18.50 euros and the estimated journey time is quoted as 2 hours 56 minutes. In practice, I'd allow extra time for finding your final destination in Paris and estimate a total journey time approaching three and a half hours.
To check the ViaMichelin information, go here:
http://www.viamichelin.com
Chris