When it comes to circular saw blades, you have a lot of options.
There's no need to feel overwhelmed, though.
Here's the "buzz" on choosing the right circular saw blade for your job.
Smaller, 5-inch diameter to 7.25-inch diameter blades are usually used on handheld circular saws.
Larger, 10-inch diameter and 12-inch diameter blades are typically for table saws and power miter saws.
Once you know which size you need, there are two important factors to consider
when choosing a blade for your circular saw: the size of the blade, and the number of teeth.
A 40-tooth blade would be a good choice for ripping or making rough crosscuts in heavy wood.
A 60-tooth blade, on the other hand, is a good all-around blade.
It'd be good for ripping or for giving semi-smooth crosscuts.
Finally, there are 80-, 90-, or 100-tooth blades.
These give increasingly finer cuts as the blade count goes up.
They're ideal for finish work and for cutting cabinet-grade plywood.
Keep these basics in mind, and you'll be able to choose the right blade for the job.
Link from: https://www.ronhazelton.com/tips/how_to_choose_a_circular_saw_blade