Here's the breakdown of the 800,000.
As to the contractors? i don't think we'll ever know the total trickle down effects.
We'll never know how many people had their home buying plans changed... the number of farmers who will plant without the guidance of the Dept of agriculture, the companies who lost employees because they couldn't pay them, the cost to rehire new employees and train them, because the shutdown led them to new jobs. How many people who live paycheck to paycheck will suffer, and how many will lose their credit standing...and on and on.
The government may stop, but the world goes on. Who knows how much will be lost? Pick your area of concern.