If the setting is by the circumference, then you can estimate it by adding twice the tire width to the BSD of the wheel and multiplying by 3.14. Tire height on the rim is roughly equal to it's width. A 700C wheel will always have a BSD of 622mm.
So that'd give you a circumference of 2191.72. So use 2192. If you find that is doesn't come up true when you ride a measured distance, you can adjust that number to match by just using simple math to figure out the difference.
Since you are using a really wide tire on that 700C rim, you might find your answer in the tables for a 29er or 29" tire which also will always have the same 622mm BSD. Up until recently, 700C tires where typically less than 30 mm. So a lot of tables for wheel size on bike computers never went larger.
You can also measure it by doing a roll out. Put a piece of tape on the ground and then put the valve stem of the wheel over it. With your weight on the bike, roll the tire one revolution and then measure the distance between in millimeters. Or roll several times keeping track of the number of turns and then measure and divide.