DeWalt 12-Inch Cordless Miter Saw: Which of the 3 Models Fits You
DeWalt actually makes three different cordless 12-inch miter saws, not one – the DCS781 (60V, single battery), the DHS790AT2 (120V, two batteries or a plug-in AC adapter), and the DCS785 (20V Max XR, the widest cut and newest dust collection). Which one is “the” DeWalt 12-inch cordless miter saw depends on which power system fits how you already work.
Most articles on this topic talk about “the DeWalt 12-inch cordless miter saw” as if there’s a single model. There isn’t, and picking the wrong one of the three for your situation is an easy way to end up with an $800+ tool that doesn’t fit your existing battery lineup. Here’s how the three actually differ, plus honest guidance on safety limits, maintenance, and what it can and can’t cut.
The Three Real Cordless 12-Inch Options
Widest-Cutting 20V Cordless Pick
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DeWalt DCS785WW1 20V Max XR 12″ Miter Saw Kit – $879.00 Runs on the same 20V Max batteries as most DeWalt drills and drivers, and cuts a 14-inch board where the other two cordless 12-inch models max out at 12-3/16.
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| Model | Power | Weight (tool only) | Max horizontal cut | Notable feature |
|---|---|---|---|---|
| DCS781 | 60V MAX, one FlexVolt battery | ~50.9 lbs | 12-3/16 in | Regenerative braking extends runtime |
| DHS790AT2 | 120V MAX, two FlexVolt batteries – or AC adapter | ~56 lbs | 12-3/16 in | Only one that also runs on a wall outlet |
| DCS785 | 20V MAX XR, two 20V batteries | ~51.7 lbs | 14 in | Widest cut capacity, up to 97% dust capture |
The practical difference comes down to your existing battery system. If you already own 20V Max DeWalt tools, the DCS785 shares those batteries and cuts the widest boards. If you’re building a FlexVolt-only shop, the DCS781 is lighter and simpler. If you need the option to plug into a wall outlet for an all-day job without swapping batteries, the DHS790AT2’s AC adapter is the one feature none of the others have.
Setting Up and Making Your First Cuts
- Fully charge the battery (or batteries) before starting – a partially charged FlexVolt pack can cause the saw to bog down mid-cut on thicker stock.
- Bolt or clamp the saw to a stand or bench. These saws are heavy but not immovable, and a shift mid-cut is a real kickback risk.
- Set the miter angle using the detent plate, then lock it down firmly before cutting – don’t rely on the friction of the miter lock alone for repeat cuts.
- For bevel cuts, unlock the bevel lever, tilt to the marked angle, and re-lock before the saw touches the wood.
- Clamp the workpiece with the saw’s material clamp for anything you’re not holding flat with both hands away from the blade path.
- Let the blade reach full speed before it contacts the wood, and let it stop spinning completely before lifting it back up after the cut.
What This Saw Can’t Safely Cut
DeWalt’s own manuals for these saws state plainly not to cut metal, plastic, masonry, or fiber cement – that warning applies regardless of which blade is mounted. In practice, some woodworkers do cut aluminum on a 12-inch miter saw, but only with a purpose-built, carbide-tipped non-ferrous metal blade, the workpiece clamped down solidly, and a slow feed rate. Steel is a different story: cutting steel on a wood miter saw, even with a “metal cutting” blade, is genuinely dangerous – the blade isn’t rated for the heat and forces involved, and manufacturers explicitly warn against it. If you need to cut steel or thin-gauge metal regularly, use a dedicated cold-cut saw or metal-cutting chop saw instead, not this tool with a swapped blade.
Projects That Suit a 12-Inch Saw’s Extra Capacity
The main reason to go with a 12-inch blade over a smaller 10-inch saw is crosscut width. A 12-inch saw handles a 2×12 in one pass where a 10-inch saw needs the board flipped, which matters for:
- Deck and bench framing – wide dimensional lumber cut cleanly in one motion instead of two lined-up passes.
- Crown molding and baseboard – the extra vertical and nested cutting capacity handles taller trim profiles without special jigs.
- Picture frames and small joinery – not because the extra capacity is needed here, but because the same saw covers both large framing work and fine miters without owning two saws.
Maintenance That Actually Matters
Blade cleanliness affects cut quality more than most people expect – pitch and resin buildup on the teeth causes burning and rough cuts long before the blade is actually dull. Wipe the blade with a resin-dissolving cleaner (or even a citrus-based degreaser) after any resinous softwood project, not just when it looks visibly dirty.
Check the miter and bevel detents periodically for slop – a saw that’s been dropped or transported roughly can develop play in these mechanisms that throws off supposedly “locked” angle settings without any obvious visual sign. A quick test cut on scrap at 0 and 45 degrees, checked with a square, catches this before it ruins a real workpiece.
Store FlexVolt and 20V batteries partially charged (60-80%) rather than fully drained or fully topped off if the saw will sit unused for more than a few weeks – lithium-ion packs degrade faster stored at either extreme.
Frequently Asked Questions
Is there only one DeWalt 12-inch cordless miter saw?
No. DeWalt currently sells three: the DCS781 (60V, single FlexVolt battery), the DHS790AT2 (120V, dual FlexVolt batteries or a plug-in AC adapter), and the DCS785 (20V Max XR, dual 20V batteries, 14-inch max cut). They share the 12-inch blade size but differ in power system, weight, and cut capacity.
Can a DeWalt cordless miter saw cut metal?
DeWalt’s manuals explicitly warn against cutting metal, plastic, or masonry with these saws. Some woodworkers cut aluminum using a dedicated non-ferrous carbide blade with the work firmly clamped, but that’s outside the manufacturer’s intended use. Steel should not be cut on this saw with any blade – use a dedicated metal-cutting saw instead.
Which DeWalt 12-inch cordless miter saw should I buy?
Match it to batteries you already own. Existing 20V Max DeWalt tool owners get the most value from the DCS785, which also cuts the widest boards at 14 inches. FlexVolt-only shops fit better with the lighter DCS781. If you need the option to run off a wall outlet on long jobs, the DHS790AT2 is the only one of the three with an AC adapter option.
How long does the battery last on a cordless 12-inch miter saw?
DeWalt rates the DCS781 at up to 675 cuts on 3-1/4-inch base molding with a 9.0Ah FlexVolt battery, though thicker stock like pressure-treated 4x4s drops that closer to 250-300 cuts per charge. Actual runtime depends heavily on wood species and cut thickness, so keep a spare battery on hand for full-day jobs.
If a 12-inch saw’s size or weight doesn’t fit your setup, our full guide to woodworking saw types breaks down where a 10-inch or compact 7-1/4-inch cordless miter saw makes more sense instead.
