Thanks to @Comic Books VS The World for the calculation feats so far:
https://www.youtube.com/watch?v=O3rNZ-sdjAY
Here they have him at Wall level, possibly Higher: http://vsbattles.wikia.com/wiki/Spider-Man_(Marvel_Cinematic_Universe)
But the Car feat puts him at Multi-City Block Level and the boat feat puts him at Small Town Level if he indeed hold half of the boat. We have to wait and see for that feat confirmation. But let's assume he did for the boat feat, this would be revisit after I see the movie.
That car impact was calculated at 8,565,180 N or 873 tons Multi-City Block level durability. This goes to his Attack potency as well because of his fights in Civil War against Captain America and Giant Man who were able to harm each other. They also powerscale from him.
Converter: http://www.convertunits.com/from/newton/to/tonnes
Attack Potency Table: http://vsbattles.wikia.com/wiki/Attack_Potency
Do the same for the boat feat, 3,000 Tons! Or 3.6 Kilotons! In each hand! Small Town level!
Converter: http://www.convertunits.com/from/Tons+/to/Kilotons
Insane! This is the strongest Spider-Man so far in movie universe.