DeWalt 20V Max Circular Saw DCS391B Review 2026
If you are looking for a cordless circular saw that delivers real power without dragging a cord behind you, the DeWalt 20V Max Circular Saw DCS391B deserves your attention.
This tool has earned thousands of positive reviews on Amazon, and it remains one of the best selling 6.5 inch cordless saws on the market. But does it hold up in 2026?
Whether you are a weekend DIYer or a contractor who needs a light, portable saw on the job site, you want something that cuts clean, feels balanced, and doesn’t quit halfway through a sheet of plywood. The DCS391B promises all of that at a price that won’t empty your wallet.
Key Takeaways:
- The DeWalt DCS391B runs a 5,150 RPM motor that handles framing lumber, plywood, and sheet goods with ease. It cuts 2x material at both 90 and 45 degree angles, making it a solid choice for general construction and home improvement projects.
- It weighs about 7 pounds with a battery, which makes it one of the lighter cordless circular saws available. The magnesium shoe keeps the weight low while adding long term durability and cut accuracy.
- Bevel capacity goes from 0 to 50 degrees, giving you more flexibility than many competing saws. This means you can tackle angled cuts on trim, rafters, and more without switching tools.
- This is a bare tool, so batteries and chargers are sold separately. If you already own DeWalt 20V Max tools, your existing batteries will work perfectly with this saw.
- The 6.5 inch carbide tipped blade provides a maximum cutting depth of 2 1/8 inches at 90 degrees and 1 5/8 inches at 45 degrees. These numbers are strong for a compact cordless saw.
- Users consistently praise the comfort grip and the electric brake that stops the blade quickly after each cut. The saw feels secure in hand, and the brake adds a real layer of safety.
DeWalt 20V Max Circular Saw DCS391B Overview
The DeWalt DCS391B is a 20V Max cordless circular saw built for DIYers, hobbyists, and professionals who need a portable cutting solution. It uses a 6.5 inch blade and runs on the DeWalt 20V Max battery platform. This means it shares batteries with dozens of other DeWalt tools.
DeWalt has positioned this saw as a sidewinder style circular saw. The motor sits beside the blade, which keeps the saw compact and easy to control. This design also reduces overall weight.
The saw ships as a bare tool. You will not find a battery or charger in the box. DeWalt designed it this way because many buyers already own 20V Max batteries from other tools.
At around $99 on Amazon, this saw punches above its price point. It offers features like a magnesium shoe, an electric brake, and a comfortable rubber grip that some more expensive saws lack.
Motor Performance and RPM
The heart of the DCS391B is its 5,150 RPM motor. This motor delivers consistent speed through dimensional lumber, OSB, and plywood. It won’t stall on standard cuts through 2×4 pine or even harder materials like oak.
The motor is brushed, not brushless. This is worth noting because brushless motors run more efficiently and last longer. However, the brushed motor in the DCS391B still delivers strong performance for the price. Many users report years of reliable service from this saw.
One area where the brushed motor shows its limits is battery efficiency. Brushed motors draw more power than brushless ones. You may notice shorter run times compared to brushless saws like the DeWalt DCS565B. For quick cuts and light to medium tasks, though, battery life is rarely a concern.
The motor maintains speed well under load. It doesn’t bog down during rip cuts in 3/4 inch plywood. That steady RPM keeps your cuts clean and reduces blade wander.
Build Quality and Design
DeWalt built the DCS391B with job site durability in mind. The magnesium shoe is the standout feature here. Magnesium is lighter than steel but strong enough to handle drops and rough handling. It keeps the base flat over time, which means your cuts stay accurate.
The upper and lower blade guards are also well constructed. They retract smoothly and snap back into place without sticking. This is important because a sticky guard slows your workflow and can create safety issues.
The overall ergonomic design puts the handle and trigger in a natural position. You can make long cuts without hand fatigue. The rubber overmold on the grip absorbs vibration and gives you solid control even with sweaty hands.
The saw feels balanced from front to back. It doesn’t tip forward or pull to one side during cuts. This balance is a key reason why so many users prefer the DCS391B over bulkier competitors.
Top 3 Alternatives for DeWalt 20V Max Circular Saw DCS391B
1. DeWalt DCS565B 20V Max Brushless 6.5 Inch Circular Saw
2. Makita XSS02Z 18V LXT 6.5 Inch Cordless Circular Saw
3. Milwaukee 2630-20 M18 18V 6.5 Inch Cordless Circular Saw
No products found.
Cutting Depth and Bevel Capacity
The DCS391B delivers a maximum cutting depth of 2 1/8 inches at 90 degrees. At a 45 degree bevel, the depth drops to 1 5/8 inches. These numbers let you cut through standard 2x lumber in a single pass.
The bevel adjustment ranges from 0 to 50 degrees. Most circular saws stop at 45 degrees. That extra 5 degrees gives you more flexibility for compound angle cuts on trim work and rafters. It’s a small detail that makes a real difference on the job.
The depth adjustment lever is easy to reach and locks firmly. You can set the blade depth quickly between cuts without fumbling with a hard to reach knob. The bevel adjustment, however, has drawn some criticism. A few users find the bevel scale cluttered and slightly difficult to read in low light conditions.
Despite that minor complaint, the DCS391B offers excellent cut capacity for a 6.5 inch cordless saw. If you regularly cut 2×6 or 2×8 lumber at 90 degrees, this saw handles it well. For thicker material, you would need a 7.25 inch saw.
Battery Compatibility and Runtime
The DCS391B runs on the DeWalt 20V Max battery platform. This platform includes compact 2.0Ah batteries, standard 3.0Ah and 5.0Ah packs, and the larger FlexVolt batteries. The saw accepts all of them.
With a 5.0Ah battery, you can expect roughly 200 to 300 crosscuts through 2×4 lumber on a full charge. This number drops with harder materials or continuous rip cuts. A 2.0Ah battery will deliver significantly fewer cuts, so upgrading to a larger pack is worth the investment if you plan on heavy use.
Battery life is the biggest trade off with this saw. The brushed motor draws more current than a brushless one. If you run through batteries quickly, consider upgrading to the DCS565B, which uses a brushless motor for better efficiency.
The good news is that 20V Max batteries charge relatively fast. A standard charger takes about 60 to 90 minutes for a 5.0Ah pack. DeWalt’s fast charger cuts that time in half.
Blade Type and Blade Changes
The DCS391B comes with a 6.5 inch 18 tooth carbide tipped blade. This blade handles general purpose cuts in framing lumber, plywood, and OSB. It’s a good starter blade for rough work.
For finer cuts in hardwood or finished plywood, you may want to swap to a higher tooth count blade. A 40 tooth blade produces much cleaner edges. Several aftermarket brands offer 6.5 inch blades that fit the DCS391B perfectly.
Blade changes are fast and tool free thanks to the spindle lock. You press the spindle lock button on top of the saw, then use the included wrench to loosen the blade bolt. The entire process takes under a minute.
The arbor size is 5/8 inch, which is standard for most 6.5 inch circular saw blades. This means you have a wide selection of replacement blades to choose from at any hardware store or online retailer.
Comfort, Grip, and Ergonomics
The DCS391B features a rubber overmolded grip that wraps around the main handle. This grip reduces vibration and provides a secure hold. It feels natural in both right and left hands, though the saw is designed primarily for right handed users.
The trigger mechanism includes a safety switch that you press before the trigger engages. This two step process prevents accidental starts. It adds a fraction of a second to your startup, but the safety benefit is worth it.
At about 7 pounds with a battery, this saw is light enough for overhead cuts and extended use. You won’t feel fatigued after cutting down a stack of sheet goods. The compact size also makes it easy to store in a tool bag or on a shelf.
The handle position puts your hand directly in line with the blade. This alignment gives you better cut visibility and more control. You can follow a pencil line with precision, especially at slower feed rates.
Safety Features
Safety is a strong point for the DCS391B. The electric brake stops the blade within seconds after you release the trigger. This feature prevents the blade from spinning freely after each cut, reducing the risk of accidental contact.
The lower blade guard retracts automatically as you push the saw into the material. It returns to the closed position the moment you finish the cut. The guard moves smoothly and does not stick or jam during normal use.
The two step trigger mechanism adds another layer of protection. You must deliberately press the safety lockout and then squeeze the trigger. This prevents the saw from starting if it is bumped or dropped.
DeWalt also provides a 3 year limited warranty on the DCS391B. This warranty covers manufacturing defects and gives you peace of mind. You can register your saw online to activate the warranty.
Portability and Job Site Use
One of the biggest advantages of the DCS391B is portability. You don’t need an extension cord. You don’t need to find an outlet. You charge a battery, snap it in, and start cutting. This freedom changes the way you work.
On a roof, a deck, or a remote job site, this saw shines. You can move from cut to cut without tripping over cords. The compact size fits into tight spaces like closets, attics, and crawl spaces where a full size corded saw would be awkward.
The lightweight design also benefits users who carry tools up ladders or across large properties. Every ounce matters after a full day of work. The DCS391B keeps the load light without sacrificing cutting power.
For professional contractors, this saw works best as a secondary saw. Use a corded 7.25 inch saw for heavy duty rip cuts, and pull out the DCS391B for crosscuts, trim work, and quick adjustments.
DeWalt DCS391B vs DeWalt DCS565B
The DCS565B is the brushless upgrade to the DCS391B. It uses the same 20V Max battery platform and cuts with the same 6.5 inch blade. The key difference is the motor.
A brushless motor runs cooler, lasts longer, and uses battery power more efficiently. The DCS565B delivers up to 25% more runtime per charge compared to the DCS391B. If battery life matters to you, the DCS565B is the better pick.
The DCS565B also feels slightly smoother during cuts. The brushless motor maintains speed more consistently under heavy load. However, the price difference is noticeable. The DCS565B typically costs $30 to $50 more than the DCS391B.
If you are a casual DIYer who makes a few cuts per weekend, the DCS391B offers the best value. If you cut daily or work on large projects, the DCS565B’s efficiency saves you time and battery swaps.
Who Should Buy the DeWalt DCS391B?
This saw fits a specific type of user perfectly. DIYers and home improvement enthusiasts will love the combination of power, portability, and price. It handles deck boards, fence pickets, shelving, and general framing with ease.
Hobbyist woodworkers who need a portable saw for breaking down sheet goods will also appreciate the DCS391B. It cuts plywood and MDF cleanly, especially with a higher tooth blade installed.
Contractors who already own the DeWalt 20V Max battery system should consider this saw as a convenient grab and go option. It fills the gap between your full size corded saw and a jigsaw or oscillating tool.
This saw is not ideal for heavy duty framing, continuous rip cuts in hardwood, or tasks that demand a 7.25 inch blade. If those are your primary needs, look at larger saws like the DeWalt DCS575B or the Milwaukee M18 FUEL 2732.
Pros and Cons of the DeWalt DCS391B
Pros:
The DCS391B delivers strong cutting power at 5,150 RPM. The magnesium shoe adds durability without adding weight. The 0 to 50 degree bevel range exceeds most competitors. The rubber grip absorbs vibration and keeps the saw secure. The electric brake stops the blade fast for added safety. Price is very competitive for a name brand cordless saw.
Cons:
The brushed motor uses more battery than a brushless alternative. Batteries and charger are not included, which adds to the total cost for first time DeWalt buyers. The bevel scale can be hard to read in dim light. The 18 tooth included blade produces rough cuts on finished wood. You will need to buy a finer blade separately for clean cuts.
Maintenance Tips for Long Saw Life
Keep your DCS391B running strong with a few simple maintenance steps. After each use, blow sawdust off the motor vents with compressed air. Dust buildup causes the motor to run hot and reduces its lifespan.
Check the blade guard regularly. Make sure it retracts and returns smoothly. A sluggish guard needs cleaning. Use a dry cloth to wipe debris from the guard track.
Inspect the magnesium shoe for flatness. If the base gets bent from a drop, your cuts will be inaccurate. Replace the shoe if you notice any warping.
Store the saw in a dry location. Moisture can corrode the blade and internal components. Remove the battery during storage to prevent slow discharge and potential damage.
Replace the carbon brushes when they wear down. The DCS391B uses a brushed motor, so the brushes do wear over time. DeWalt sells replacement brushes at a low cost. Changing them is a quick process that extends your saw’s life significantly.
Final Verdict: Is the DeWalt DCS391B Worth It in 2026?
The DeWalt DCS391B remains a fantastic cordless circular saw for the money. It delivers reliable power, excellent portability, and solid build quality. The 5,150 RPM motor handles most common cutting tasks without breaking a sweat.
Yes, the brushed motor is older technology. Yes, you need to buy batteries separately. But for the price point, few cordless saws match the DCS391B’s overall value. It’s a proven tool with thousands of satisfied users and a strong warranty.
If you already own DeWalt 20V Max batteries, this saw becomes an easy recommendation. If you are new to the DeWalt platform, factor in the cost of at least one battery and charger. Even with that added expense, the total cost stays competitive.
Bottom line: the DeWalt DCS391B earns its place as one of the best budget cordless circular saws in 2026.
Frequently Asked Questions
Does the DeWalt DCS391B come with a battery and charger?
No. The DCS391B is sold as a bare tool. You need to purchase a DeWalt 20V Max battery and charger separately. If you already own other DeWalt 20V Max tools, your current batteries will work perfectly with this saw.
What is the maximum cutting depth of the DCS391B?
The saw cuts up to 2 1/8 inches deep at 90 degrees and 1 5/8 inches at a 45 degree bevel. This is enough to cut through standard 2x lumber in one pass.
Is the DeWalt DCS391B brushless?
No. The DCS391B uses a brushed motor. If you want a brushless version, consider the DeWalt DCS565B, which offers better battery efficiency and longer motor life.
Can the DCS391B cut through hardwood?
Yes. The 5,150 RPM motor can cut through hardwoods like oak and maple. However, you should use a higher tooth count blade for cleaner results. The included 18 tooth blade works best for framing and rough cuts.
What size blades fit the DeWalt DCS391B?
The saw uses 6.5 inch blades with a 5/8 inch arbor. This is a standard size, so you can find replacement and upgrade blades at most hardware stores and online retailers.
How heavy is the DeWalt DCS391B?
The saw weighs approximately 7 pounds with a battery installed. Without a battery, it is lighter. This makes it one of the more portable cordless circular saws available.
Is the DCS391B good for professional use?
The DCS391B works well for light to medium duty professional tasks. It is best used as a secondary saw for crosscuts, trim, and quick adjustments. For heavy duty daily cutting, a brushless or 7.25 inch saw would serve you better.
