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DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only vs Ryobi One P505 18V Lithium Ion Cordless 5 1/2"

Updated July 2026 — DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only wins on weight and safety, Ryobi One P505 18V Lithium Ion Cordless 5 1/2" wins on price.

The DEWALT ATOMIC 20V MAX* Circular Saw is a superior choice for professional use, while the Ryobi One P505 is more suited for casual DIY tasks.

Why DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only is better

Performance

DEWALT has a brushless motor for extensive cutting.

Safety Features

DEWALT includes an electronic blade brake.

Cutting Capacity

DEWALT can cut through thicker materials.

Why Ryobi One P505 18V Lithium Ion Cordless 5 1/2" is better

Price

Ryobi is significantly cheaper.

Weight

Ryobi is lighter and easier to handle.

Battery Compatibility

Ryobi works with multiple 18V batteries.

Overall score

DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only
85
Ryobi One P505 18V Lithium Ion Cordless 5 1/2"
65

Specifications

SpecDEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool OnlyRyobi One P505 18V Lithium Ion Cordless 5 1/2"
Motor TypeBrushlessBrushed
Max RPMNo data4700
Bevel Angle45 degrees50 degrees
Battery Type20V MAX*18V
Cutting Capacity2x material5-1/2 inch

Dimension comparison

DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool OnlyRyobi One P505 18V Lithium Ion Cordless 5 1/2"

Overview of the Products

The DEWALT ATOMIC 20V MAX* Circular Saw is priced at $159.00, while the Ryobi One P505 is significantly cheaper at $44.89, making it about 72% less expensive. Both products are cordless circular saws but cater to slightly different user needs and preferences. The DEWALT saw is designed for professional-grade work with a brushless motor, while the Ryobi saw is more suited for DIY enthusiasts and household tasks.

Performance and Power

When it comes to performance, the DEWALT ATOMIC offers a brushless motor capable of cutting up to 369 linear feet of 3/4-inch OSB with a compatible battery. This makes it suitable for extensive jobs without the need for frequent recharging. In contrast, the Ryobi One P505 operates at 4,700 RPM, delivering power comparable to corded models but is ideal for lighter, everyday applications. The DEWALT’s higher performance level suggests it is better suited for professional use, while the Ryobi is more of a functional choice for casual users.

Design and Usability

The DEWALT saw features a removable auxiliary handle, which enhances control during cuts, and an on-board dust port to maintain a cleaner workspace. Its bevel gear design allows for precise cuts at 90 degrees and 45 degrees. Meanwhile, the Ryobi P505 is equipped with a GRIPZONE overmold for improved handling and a transparent lower guard for better visibility. While both saws have unique design elements aimed at enhancing user experience, the DEWALT's features indicate a focus on professional-grade usability.

Cutting Capacity

The DEWALT ATOMIC can cut through 2x material at 90 degrees, making it highly effective for framing and structural tasks. The Ryobi P505, with a 5-1/2-inch blade, provides versatility with an adjustable bevel up to 50 degrees, allowing for different cutting angles. While both saws offer respectable cutting capacities, the DEWALT excels in its capability to handle thicker materials, positioning it as more suitable for serious woodworking or construction tasks.

Safety Features

Safety is a crucial consideration in power tools. The DEWALT ATOMIC includes an electronic blade brake that quickly stops the blade for enhanced safety and productivity. It also features a finger trigger that allows for better control when cutting. The Ryobi P505, while lacking an electronic brake, does have an extra side handle for improved control, particularly useful for making precise cuts. Although both saws prioritize user safety, the DEWALT's electronic brake offers an added layer of protection.

Battery Compatibility

The DEWALT ATOMIC is compatible with 20V MAX* batteries, specifically designed for high-performance tools. In contrast, the Ryobi P505 operates on Ryobi’s 18V battery system, which is versatile and works with multiple tools in the Ryobi ONE+ lineup. If you already own Ryobi batteries, the P505 may be the more practical choice. However, the DEWALT's battery system is designed for heavier-duty applications, which may justify the higher investment for users who need maximum power.

Pricing and Value

At $159.00, the DEWALT ATOMIC is a significant investment compared to the Ryobi P505, which is priced at $44.89. This makes the DEWALT about 253% more expensive than the Ryobi. However, the higher cost of the DEWALT can be justified by its superior performance, safety features, and suitability for professional tasks. The Ryobi, while much cheaper, may not offer the same level of durability and power, making it a better fit for casual users or those with lighter cutting needs.

Which should you buy?

Choosing between the DEWALT ATOMIC 20V MAX* Circular Saw and the Ryobi One P505 ultimately depends on your specific needs. If you require a robust, high-performance tool for professional applications, the DEWALT is worth the investment with its advanced features and cutting capabilities. However, if you are a DIY enthusiast looking for an affordable and versatile tool for lighter tasks, the Ryobi P505 is an excellent choice, offering significant savings without sacrificing too much in terms of usability.