• Dewalt 18v Cordless circular saw review
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Amazon Price: $119.00 $69.99 You save: $49.01 (41%). (as of January 20, 2019 9:39 am – Details). Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on the Amazon site at the time of purchase will apply to the purchase of this product.

Whether building wood decks or dormers, bookcases or kitchen cabinets, the professional-duty DEWALT DC390B 18-volt, 6-1/2-inch cordless circular saw delivers cordless convenience without sacrificing power or performance. An 18-volt battery (not included) drives the saw's 6-1/2-inch, thin-kerf blade at 3,700 RPM, an optimum speed for crosscutting and ripping construction lumber, softwood, hardwood, plywood, particleboard, oriented-strand board, and virtually any other sheet.

3,700 RPM for fast rip cuts and cross cuts
(view larger).

DC390B 18-Volt 6-1/2-Inch Cordless Circular Saw
At a Glance: 3,700 RPM for fast rip cuts and cross cuts

Includes carbide-tipped blade

Bare tool–doesn't include battery or charger

Three-year limited warranty; one-year free service

Power and Performance

With depth-of-cut capacities of 2-1/4-inch at 90-degrees and 1-5/8-inch at 45-degree (bevel), the DC390B can slice through all 2-by dimensional lumber. The 6-1/2-inch carbide tipped blade gives you 2x cutting capacity at 90 and 45 degrees, and the 0-50-dgree bevel capacity provides additional capacity for a multitude of applications.

A high strength magnesium shoe and upper guard provides increased durability, while a fan-cooled motor with replaceable brushes provides maximum power and durability. It's complemented by a vibration-dampening rubber-grip handle for comfortable handling on big jobs. This circular saw weighs 6.3 pounds.

Bare Tool

This DEWALT cordless tool does not come with a battery or charger. It's compatible with the DC9096 18-volt XRP battery pack and DW9117 15-minute charger.


This DEWALT tool is backed by three-year limited warranty covering any defects due to faulty materials or workmanship (from the date of purchase). It's also covered by DEWALT's one-year free service contract, where DEWALT will maintain the tool and replace worn parts caused by normal use–for free.

What's in the Box

One DEWALT DC390B 18-volt 6-1/2-inch cordless circular saw, one carbide tipped blade, one blade wrench, and operating instructions (batteries and charger sold separately).

0-50 degree bevel capacity provides additional capacity for a multitude of applications (view larger).

Technical Details

  • Mfr. item number – DC390B 3,700 RPM no load speed 6-1/2 in. carbide-tipped blade 5/8 in. arbor High strength magnesium shoe & upper guard 0-50 degree bevel capacity Fan-cooled motor with replaceable brushes Depth of cut at 45 degrees – 1-5/8 in. Depth of cut at 90 degrees – 2-1/4 in. Includes blade & blade wrench Batteries & charger sold separately Weight: Approximately:7.75 pounds Shipping Dimensions: Approximately 8.88 x 15.94 x 10.5 inches.

Customer Reviews


 on December 22, 2015
By KirkInBama
The DeWalt saw DC390B is one tough little saw! I have owned this saw for several years before my last one met its untimely demise from being thrown from a 3 story roof to the street below, and it wasn’t the saws fault by no means, I had bought some cheap replacement batteries from amazon, (URPOWER® 2 Pack 18V Battery for DEWALT) and after the 4-5th time the battery pack fell out of the saw from trying to cut the same 2×6 rafter the whole dang unit went flying, so I had to buy another saw and REAL DeWalt Battery packs. But, with that being said, my previous saw which is the very same saw has been VERY dependable for 5 days a week, 45 weeks a year and for 3 years straight before I had to replace the batteries and if it wasn’t for my little outburst, the saw would have still been going today if I didn’t buy cheap crappy batteries. But it was looking rough and was needing to be replaced, but it still cut straight and true and has never gave me a minute of trouble! Just like I hope this new one does!!!

Five Stars

 on November 10, 2016
By BillyMe
I used it for 5 minutes. Worked flawlessly

Consider Dewalt Please

 on February 2, 2018
By rob
I bought the first Dewalt 18 volt set in 2004. I gave the original one to my grandson for his construction business. It is still working but is getting tired. I replaced it with a new one this year 2018. The original one was used for crosscut and rip on lumber up to and including 2×12, hardie plank, and steel roofing. It is a very friendly tool on the roof, crawl spaces, and rafters. The saw is very robust as well. We have dropped it more than once from a roof and rafter location. I have a worm drive Makita that is a great saw as well but it has seen most of it duty diminished due to the convince of the Dewalt unit. The Makita saw is a great framing and large construction saw. Dewalt 18 volt cordless tools have expedited our output on many projects. We have used other cordless tools as well but in my opinion the broad range of tools that Dewalt has to offer in the 18 volt line is very useful. The real consumer friendly thing that Dewalt did was supporting the 18 to 20 volt upgrade with a adapter for most of the older lines. This is very business friendly because it allow an upgrade to occur as the older units need replaced instead of the large bit for a new line. Thanks Dewalt.

Pleasantly Surprised

 on January 24, 2014
By J. McGaw
I bought this saw to use primarily for ‘breaking down’ large heavy sheet goods while they are on my trailer before hauling the pieces into my wood shop for final cutting and fitting. It is far easier to move a quarter or third of a sheet of 7/8″ plywood single handed than a whole sheet, especially in a cramped shop with a low ceiling. I wasn’t really expecting the saw to do more than that but I can say now that it is fully up to normal remodeling service with the stock blade it delivers with. With the DC9180 battery (the ‘heavy’ one) it is a third the weight of my old lightweight Craftsman circular saw an probably a sixth the weight of my heavy worm-drive Milwaukee. While it certainly doesn’t have the power of either of these it easily cuts 3/4″ plywood (I’ve ripped several sheets lengthwise already) and regular 2-by framing lumber and this is probably all any home user will ever need to do. I do recommend that you use it with the DC9180 battery rather than the lighter DC9181 for the extra run time although it will run on the latter. For me, the hardest thing to get used to is the lack of a cord since I have always been paranoid about the cord on my other saws getting in the way or getting hung up on the work.

Just what I was wanting

 on March 9, 2013
By J. Bruha
I had a 14.4 V Dewalt circular saw for years, and used the snot out of it. It was just the thing to make a cut or two on a roof, or while remodeling when you had to have the power turned off in that area of the house. Eventually, I made the change to 18V tools, and when my last 14.4 battery died, it was cheaper to buy this saw, than 2 replacement 14.4 batteries.

This little saw came in very handy when we put …

 on September 11, 2016
By Mary
This little saw came in very handy when we put a new roof on the house. We eliminated the old style vents and this worked well to cut out to patch in new decking and to cut the new ridge vent. Cordless is the way to go on the roof. This tool operated as expected and my husband appreciated the gift


 on November 1, 2016
By Dalton
Used it with old batteries from my drill. Works great. Have to have a charger handy though. Shoot, as good as the old 18 volt stuff works I see no need to spend a bunch money for all the new 21 v stuff and new battery technology. Just have a charger handy and you’re golden. Inverter in the truck works just fine when away from a power source.

Pretty good for what it is

 on June 2, 2013
By Ivan C.
I just got this saw and used it to make some shelves. All circular saws I’ve owned in the past were corded. I had used other cordless circular saws before and was disappointed, but I can say this one was good enough to get the job done. I would recommend it to someone who is doing small jobs, or if portability and cordless capability are extremely important.

Very Good Value

 on May 17, 2013
By Joe Doakes
I bought this unit as a “bare-tool” saw because I ordered a Dewalt drill with two batteries and a charger. Turns out that was a good move because those batteries hold a charge and recharge very fast. I worked all day using both the saw and driver on a single charge.
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