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A standard 7-1/4 inch circular saw cuts about 2-7/16 inches deep at 90 degrees and about 1-3/4 inches at a 45 degree bevel. That clears a 2x4 laid flat with room to spare, and only just clears one on the bevel. It cannot cut a 3-1/2 inch 4x4 in one pass — that takes two cuts from opposite faces. Usable depth is always well under the blade radius because the arbor, guard and shoe occupy the difference. Smaller 6-1/2 inch saws reach roughly 2-1/8 inches; 10-1/4 inch saws reach about 3-3/4 inches.
How deep does each blade size cut?
Depth scales with blade diameter but never reaches the radius. These are the figures manufacturers publish across the common sizes, and individual models vary by an eighth of an inch either way, so check the spec sheet for your saw before planning a cut.
| Blade | Depth at 90° | Depth at 45° | Clears |
|---|---|---|---|
| 4-1/2 in (compact) | ~1-9/16 in | ~1-1/8 in | Plywood, 1x stock |
| 5-3/8 in | ~1-3/4 in | ~1-1/4 in | 2x flat, not on bevel |
| 6-1/2 in | ~2-1/8 in | ~1-9/16 in | 2x flat, marginal at 45° |
| 7-1/4 in | ~2-7/16 in | ~1-3/4 in | 2x flat and on bevel |
| 8-1/4 in | ~2-13/16 in | ~2-1/8 in | 2x plus wet-set framing |
| 10-1/4 in | ~3-3/4 in | ~2-5/8 in | 4x4 in one pass |
Remember that lumber dimensions are nominal. A 2x4 is 1-1/2 by 3-1/2 inches, a 2x6 is 1-1/2 by 5-1/2, and a 4x4 is 3-1/2 by 3-1/2. It is the actual figure that has to fit under the shoe.
How do you cut stock thicker than the saw reaches?
Cut from two opposite faces and let the kerfs meet in the middle. Square a line all the way around the piece with a speed square first — this is what keeps the two cuts aligned, and skipping it is why home-cut 4x4 posts often show a visible step. Set the depth to slightly more than half the thickness so the kerfs overlap. Make the first cut, roll the piece 180 degrees, and cut again with the shoe running on the same reference edge. For a 6x6, which is 5-1/2 inches thick, even four passes with a 7-1/4 inch saw will leave a core; finish that with a reciprocating saw or a hand saw. Our guide to squaring cuts with a speed square covers the layout, and cutting a straight line with a circular saw covers the technique.
How should you set the depth for a normal cut?
Set the blade so roughly a quarter inch — about one tooth — projects below the underside of the material. Unplug the saw or remove the battery, retract the guard, rest the shoe on the workpiece with the blade beside the edge, and adjust until the tooth tips clear by that margin. This setting keeps more teeth engaged in the cut for a cleaner edge, exposes the minimum amount of blade below the work, and reduces the chance of a bind. Running the blade at full depth for every cut increases kickback force and loads the motor unnecessarily. CPSC injury data on portable power saws consistently points to blade contact and kickback as the dominant injury mechanisms, both of which a conservative depth setting reduces.
Does the material change what depth is safe?
The setting rule stays the same, but material changes the blade and the feed. Plywood and sheet goods cut cleanest with the blade barely through and a high tooth count blade, good face down on a circular saw since the teeth exit upward. Pressure-treated lumber is wet and heavy, so it binds more readily — support both sides of the cut and never let the offcut pinch the blade. Engineered products such as LVL and laminated beams are dense enough that a full-depth cut in one pass will bog a 15 amp saw; plan on two passes. Cutting anything other than wood, including fiber cement and metal, requires a blade rated for it and appropriate respiratory protection.
Where to go next
Choosing a saw is covered in our ranked best circular saws, which compares current models on aggregated owner ratings and recurring complaints. The corded-versus-cordless trade-off is in corded vs cordless circular saw, the blade layout question in worm drive vs sidewinder, and power draw in how many amps a circular saw draws. Everything sits under the power tools and workshop hub.
We never buy or physically handle the tools we rank — our recommendations come from aggregated owner reviews and expert consensus, and the method is on how we rank.