Bosch 12SDN vs DeWalt DWS780: 12-Inch Miter Saws

Buy the Bosch GCM18V-12SDN 18V bare tool (B0BMF8XNN1) if you already own Bosch 18V / AMPShare batteries and want cordless 12-inch capacity on the jobsite, at $659.00; buy the DeWalt DWS780 corded 12-inch slider (B00540JS7C) if you want the complete ready-to-cut kit with unlimited runtime, at $649.00. The Bosch concentrates on cordless mobility: the maker pairs BITURBO Brushless drive with the PROFACTOR 18V system, a 3-1/2 by 14-inch crosscut envelope, dual bevel with detents, a shadow LED cut line, and a 52.4-pound tool-only body with carry handle. The DeWalt concentrates on corded shop value: the maker pairs a 15-amp brushed motor at 3,800 RPM with an XPS shadow cut line, 2x14 crosscut capacity at 90 degrees, a 56-pound body, and a 3-year warranty. On 09/16/2026 the exact Bosch bare tool was $659.00 with only 1 left in stock, shipped from and sold by Amazon.com, and the exact DeWalt saw was $649.00 In Stock, shipped from and sold by Amazon.com.

Shopping note: the links in this guide are paid links to the exact listings observed for this comparison. As an Amazon Associate, Cadiens earns from qualifying purchases. Prices, stock and sellers move; confirm the model code and the live offer before buying.

Choose by your situation

Capacity and adjustments that change the decision

Both are 12-inch dual-bevel sliding compound saws, but their envelopes differ. Bosch rates the GCM18V-12SDN at 3-1/2 inches high by 14 inches wide at 0 miter and 0 bevel, 10 inches wide at 45-degree miter, and 1-1/2 inches high by 9-1/2 inches wide at combined 45-degree miter with right bevel, per its manual. DeWalt rates the DWS780 at 2x14 dimensional lumber at 90 degrees and 2x10 at 45 degrees, with a manual maximum of 4.4 inches high by 13.75 inches wide at 0 miter. For tall stock the DeWalt has the edge: 7-1/2-inch crown nested and 6-3/4-inch base vertically, against the Bosch 5-1/2-inch fence height. For wide crosscuts the Bosch leads slightly: 14 inches against 13.75 inches. Miter ranges are close: Bosch 52 degrees left and 60 degrees right with detents at 0, 15, 22.5, 31.6 and 45 degrees plus 60 right; DeWalt 50 degrees left and 60 degrees right with 10 positive stops, cam lock and detent override. Bevel goes both directions on both: Bosch selects 0 to 45 degrees each side with a 47-degree maximum position; DeWalt bevels 49 degrees left and right per its manual.

Bosch GCM18V-12SDN: the cordless pick for Bosch battery owners

The Bosch GCM18V-12SDN bare tool is the buy for readers invested in the Bosch 18V system. The maker specifies BITURBO Brushless drive on the PROFACTOR platform with AMPShare battery compatibility, recommending 6, 8 or 12 Ah high-demand packs for full performance, and states brushless performance comparable to high-demand corded tools. Practical details help on site: centered sliding bars, a carry handle, a toolless workpiece clamp, a dust bag with vacuum-hose compatibility, and a shadow LED cut line that needs no adjustment. The box holds the saw, a 12-inch blade, the clamp, the dust bag and a wrench; the battery and charger are sold separately, so a new-to-Bosch buyer must budget them on top of the $659.00 bare price. Coverage is strong on paper: 5-year limited tool warranty with 3-year battery coverage and a 180-day return promise stated on the listing. Limits: the observed Amazon unit was the last one, the listing shows only 12 ratings so social proof is thin, runtime depends entirely on the pack you attach, and no runtime measurement is published in the observed evidence.

DeWalt DWS780: the corded value pick with full kit

The DeWalt DWS780 is the buy for continuous shop work. The maker specifies a 120V 15-amp brushed motor at 3,800 RPM, dual horizontal steel rails on ball bearings, stainless miter detent plate with cam lock, tall sliding fences, and the XPS shadow system for an adjustment-free cut line. Dust collection captures over 75 percent of generated dust with the bag fitted, per the maker. The box is complete: saw, 12-inch carbide blade, blade wrench, dust bag and vertical clamp, so $649.00 is the full cost of entry before a stand or extra blades. Warranty is 3-year limited with 1-year free service and 90-day satisfaction. Limits: 56 pounds plus a cord to manage, brushed motor with no battery option, and rail travel that needs bench space behind the saw.

Power, cut lines and what the numbers do not prove

Do not compare the motors directly: 18V BITURBO brushless against 15-amp corded brushed are different power systems, and neither maker publishes measured cut counts or runtime in the observed evidence. The Bosch ECO-mode runtime extension of up to 20 percent is a maker claim, not a measured result. Both saws guide the cut optically without adjustment, Bosch with a shadow LED line and DeWalt with the XPS shadow line; neither replaces a test cut on scrap. Amp and volt figures are input ratings, and star ratings are listing displays, not test outcomes.

Handling, dust and what is in the box

Portability favors the Bosch before the battery: 52.4 pounds tool-only with a carry handle against 56 pounds corded, though an 8 or 12 Ah pack adds real weight to the Bosch. Footprints are close: 33.25 inches wide for the Bosch and about 32.3 inches long for the DeWalt. Both ship a dust bag and a material clamp; the Bosch adds vacuum-hose adapters for 1-1/4 and 1-1/2 inch hoses, while DeWalt claims over 75 percent capture through its bag. Box check: Bosch bare ships saw, blade, clamp, bag and wrench with battery and charger sold separately; DeWalt ships saw, blade, wrench, bag and clamp with nothing else to buy to start cutting.

Where to check the exact variants

Check the Bosch GCM18V-12SDN bare tool (B0BMF8XNN1) (observed at $659.00 on 09/16/2026 with only 1 left in stock, shipped from and sold by Amazon.com) and the DeWalt DWS780 with XPS (B00540JS7C) (observed at $649.00 on 09/16/2026 In Stock, shipped from and sold by Amazon.com). Model codes matter: Bosch sells glide (GDCN) and slide (SDN) 12-inch heads plus kits and bare tools that look alike, and DeWalt sells the similar DWS779 without XPS, so confirm GCM18V-12SDN and DWS780 on the exact-variant page before buying. If cordless mobility inside the Bosch 18V system matters most, take the Bosch while its observed unit lasts; if complete corded capacity with the lower all-in ticket matters most, take the DeWalt.

Sources and further reading

1. Bosch — GCM18V-12SDN 18V 12-inch slide miter saw
2. Bosch — GCM18V-12SD operating and safety instructions (PDF)
3. Amazon.com — Bosch GCM18V-12SDN bare tool (B0BMF8XNN1)
4. DeWalt — DWS780 12-inch sliding compound miter saw
5. DeWalt — DWS780 instruction manual N693246 (PDF)
6. Amazon.com — DeWalt DWS780 with XPS (B00540JS7C)