A dizzying array of exemptions, credits and existing tolls makes it tricky to calculate how much drivers will actually pay when they enter Manhattan south of 60th Street.

Congestion pricing is now in effect in NYC, and drivers faced the first weekday commute with the controversial new tolling system.

With over 700,000 vehicles entering the congestion charge area in Manhattan daily per MTA figures, it equates to at least $4 million per day in toll revenue for the agency.

The Big Apple’s new congestion pricing mandate has turned one city block into a pricey proposition. A single one-block stretch of First Avenue between 60th and 61st streets will now cost drivers $9 as they come off the Queensboro Bridge — even though they’re driving north and away from the zone.