A power circular saw allows you to make straight crosscuts much faster than with a handsaw, and is unparalleled for ripping along the lengths of boards. Common sizes are from 51/2 to 81/4 inches; this refers to the largest diameter of blade that fits the saw’s arbor (axle). The most common 71/4-inch model will go through surfaced 2-by framing lumber at any angle between 45 degrees and 90 degrees. Look for a model rated at between 8 and 12 amps.
How to Cut Straight with a Circular Saw
To cut straight with a power circular saw, either use the ripping fence that comes with the saw, as shown in the detail, or fasten a straightedge to the surface you’re cutting. 
For the latter approach, measure from the saw’s base plate to the blade and secure the guide that distance from your cutting line.
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