Best Cordless Circular Saws for Decking and Framing (2026)

What to look for

Deck boards, joists and stair stringers are mostly straight cuts through lumber 1-1/2 in thick or less, so nearly any circular saw will cut them square. The specs that separate saws for this job are about bevels, posts and the repeated cutting a deck takes:

• Cut depth at 45°. To bevel through a 2×, the published depth at 45° has to be at least 1-1/2 in, the dry thickness of a 2× (see nominal vs. actual lumber sizes). Every pick clears it, from 1-9/16 in to 2 in.
• Cut depth at 90°. This decides posts. The 7-1/4 in picks cut 2-7/16 in to 2-5/8 in deep; the 6-1/2 in Milwaukee cuts 2-1/4 in.
• Blade size. A 7-1/4 in blade cuts deeper; a 6-1/2 in saw is smaller and suits deck boards, plywood and square cuts.
• An electric brake. All six picks list one. It stops the blade soon after you let go of the trigger.
• Bevel range and stops. Stops at 22.5° and 45° make the common framing angles quick to repeat. Check the maximum bevel only if you cut steeper angles.
• The battery platform. Most of these are sold as bare tools. If you already own batteries for one brand, the saw for that platform is usually the right one.

Cut depth vs. real lumber thickness

Lumber is named by its nominal size, but a saw has to cut its actual size. Under the American Softwood Lumber Standard (PS 20), a dry 2× is 1-1/2 in thick and a 4×4 is 3-1/2 in square; 6 in timbers are dressed 1/2 in under nominal, so a 6×6 is 5-1/2 in. Composite decking is thinner: Trex lists its Transcend and Enhance boards at .94 in.

Bevel through a 2×:      depth at 45° ≥ 1-1/2 in
Shallowest pick at 45°:  1-9/16 in − 1-1/2 in = 1/16 in to spare
Post from two faces:     2 × depth at 90° ≥ post thickness
4×4, shallowest pick:    2 × 2-1/4 in = 4-1/2 in ≥ 3-1/2 in
6×6, deepest pick:       2 × 2-5/8 in = 5-1/4 in, 1/4 in short of 5-1/2 in

Two faces: cut to full depth, turn the post over and cut from the opposite face to meet the first kerf; that reaches twice the depth at 90°. Sizes from PS 20 (dry): 2× 1-1/2 in, 4×4 3-1/2 in, 6×6 5-1/2 in.

So the 6×6 is where a cordless circular saw runs out: the deepest pick reaches 5-1/4 in from two faces, and the last 1/4 in in the middle is finished with a handsaw. Mark all four faces from a square line so the cuts meet.

Worked example: the cuts in a deck and its stairs

The deck calculator's example deck is 16 × 12 ft, with 5.5 in boards running the 16 ft way and 3/16 in gaps. That is 26 rows of one 16 ft board each, and 29 boards to buy with a 10% allowance. Two kinds of cut come out of it:

• Crosscuts. Each of the 26 rows gets its ends cut square. Every pick cuts a .94 in composite board or a 1-1/2 in 2× in one pass.
• One long rip. The rows do not divide the deck evenly, so the last row is ripped to 1-13/16 in along its full 16 ft. A guide or track keeps a rip that long straight; the SKIL pick's shoe fits SKIL's track guide. See deck board spacing and layout for ways to avoid a thin last row.

The stair calculator's example stair climbs 108 in with 15 risers of 7-3/16 in and 14 treads of 10 in, on stringers about 176-13/16 in (14 ft 8-13/16 in) long. Each stringer comes from a 2×12, 1-1/2 in thick, which any pick cuts through at 90°; the notches are cut along the rise and tread lines, stopping at each inside corner and finishing it with a handsaw so the kerf does not run past the line (see stair layout basics).

Stringer length  = 176-13/16 in = 14 ft 8-13/16 in
Board to buy     = next even length = 16 ft 2×12
Board feet       = 2 × 12 × 16 ÷ 12 = 32 board feet

The board-foot calculator totals the framing lumber for a whole deck the same way, from the nominal sizes on your cut list.

Battery platforms, and brands not on this list

Each pick runs on one brand's battery system: DEWALT 20V MAX, Milwaukee M18, SKIL PWR CORE 20, Metabo HPT 36V MultiVolt (or a cord, through its AC adapter) and Bosch 18V, whose batteries also fit other AMPShare brands. The labels are not comparable: DEWALT states that its 20V MAX batteries are 18V nominal. Bare tools are listed here, so plan on a battery and charger if you are starting a new platform.

Two saws we considered are marked discontinued by their makers (DEWALT's DCS573B and Milwaukee's 2732-20), so they are not ranked. Makita and RYOBI are not here because we could not confirm their published cut depths from pages our source checker can read; we only rank what we can cite. For more saws and drivers for the same job, see the decking tool picks.