Dewalt DC390B 18-Volt Cordless Circular Saw Review

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  • Cool and efficient motor with 3,700 RPM cutting speed.
  • Equipped with 6-1/2-inch cutting blade with 90- and 45-degrees depth.
  • Fan-cooled motor feature plus replaceable brushes for easy maintenance.
  • Impressive and accurate 0-50-degrees bevel capacity.
  • Equipped with a thick magnesium base and blade guards.
Dewalt DC390B 18-Volt Cordless Circular Saw Review
Dewalt DC390B 18-Volt Cordless Circular Saw Review


Lightweight & Portable

Dewalt DC390B Review Lightweight

At only 8 pounds, the Dewalt DC390B is one of the most lightweight circular saws you’ll come across. And even though it’s lightweight, it delivers smooth, vibration-free performance.

Thanks to the ergonomic rubber-grip handle of the circular which reduces the vibration and rattling. Something standard circular saws are prone to do when used for a longer time. With this kind of ease of use, you can take your time with this circular saw. It won’t cause hand fatigue or stiffness.

Do not mistake the lightweight design for clumsy and inaccurate work. Because with the Dewalt, there’s no such thing as a lousy job. It does what you want it to do precisely and effectively.

Since it is a compact body, using it for different tasks in a single day is not at all a hassle. You can tackle different jobs from unique angles. Carry it to and away from your workspace and store it conveniently without wasting another minute.

Powerful Cutting Speeds

Dewalt DC390B Review Speed

The Dewalt DC390B has a 3,700 RPM motor performance with a 6-1/2-inch carbide-tipped blade. The cutting performance is quite powerful and stable with this circular saw. The size of the blade might be relatively small but it’s not lacking in torque and durability.

You can expect the blade to cut through 2x lumber easily and in a single pass. It even features dual cutting depth at 90 degrees and again at 45 degrees. So the cutting blade is versatile and adjustable to use.

What you shouldn’t expect, however, is heavy-duty use. The Dewalt DC390B is designed for intense light-duty work. It can perform exquisitely for quick, light jobs. But it will fail if you use it for anything more energetic and demanding.

So it’s better to lay down your priorities regarding the cutting blade performance before buying this lightweight and productive circular saw.

The fast-cutting blade, magnesium base, and high motor speed all complement each other. Providing stability, consistency, and durability in every task you use the Dewalt for. The average person has a need for a lightweight circular saw to cut 2x4s on-site. And that’s precisely what the Dewalt can do. It can work for longer at such scales but not bigger with regards to the size.

User-Friendly Performance

The Dewalt does have everything that makes it easy and quick to use. The depth adjustment knob and 0-50-degrees level capacity are some of the most reliable features of the Dewalt. It allows faster adjustments and more precise results.

It truly takes the ergonomic controls and adjustments to a new level. Included with the blade depth adjustment is a quick safety release mechanism. It’s not one of those that get stiffer and stiffer the more you use it. In the Dewalt, making the adjustments without hurting yourself is an easy feat.

This Dewalt has used a more ergonomic quick set and release safety valve. Not the thumb screw which can be a hassle to use sometimes. Nor do you have to press and push the safety valve in, it’s a push-forward mechanism that’s safer and way more accessible.

All this for literally half the price! It’s a wonder how this tool hasn’t gone out of stock yet. It’s very ergonomically useful, user-friendly, and most important, a compact and handy tool.

Durable & Efficient

The interior and exterior parts of the Dewalt stay cool and competent for longer. This is because of Dewalt’s fan-cooled motor that ensures smooth consistency and effective operation. The replaceable brushes improve power by limiting downtimes and maximizing productivity for demanding jobs.

The motor looks exactly like it performs, rugged and stabilizing. It won’t power down during or after cutting 2x lumber. The design features a skilled rotating blade guard that opens and closes as you’re cutting through the lumber. So this guarantees a safe, damage-free, and long-lasting cutting speed.

The blade guard also prevents wood chips or sawdust from jamming up the works. So at no point does the blade go astray or does the motor starts making funny chipping noises.

The motor is equipped with an electronic brake to stop the blade immediately after trigger release. This furthers the shelf life of the circular saw, more than you think. Because as soon as the trigger releases, the blade stops running without reversing or kickback.

This has more than one benefit for you – the first is that it saves the blade from ruining sooner. And second, you won’t end up ruining the lumber during trigger release by straying from the cutting line.

What’s also impressive about this Dewalt, in particular, is the long battery life. The battery charger has a solid design. It ensures a faster charging time when the power tool is not in use.

It doesn’t take long to recharge. Nor do you have to recharge very regularly, even if you use it a lot. You can use this for a comfortable amount of time – approximately 3-4 rips. The battery doesn’t need any extra care. Lithium-ion batteries are more efficient and ready for light yet demanding jobs.

Additional information

Specification: Dewalt DC390B 18-Volt Cordless Circular Saw Review

Engine Speed (RPM)


Voltage (V)


Power Source

Battery Powered

Depth of Cut - 90 Degrees (in)


Depth of Cut - 45 Degrees (in)


Blade Diameter (in)


Blade Location


Cord Style


Length (in)


Width (in)


Height (in)


Weight (pounds)


Shoe Material


Bevel Capacity (degrees)


Electric Brake


Laser Guide


Spindle Lock


Dust Collection


Dust Blower


Dust Port



Beams & Timber

Money-back guarantee days


Warranty (Years)


Arbor Size (in)


Batteries Included


Batteries Required


Battery Cell Type

‎Lithium Ion








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