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DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only vs Ryobi P506 One+ Lithium Ion 18V 5 1/

Updated July 2026 — DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only wins on price and rpm, Ryobi P506 One+ Lithium Ion 18V 5 1/ wins on blade size and cut depth.

The DEWALT ATOMIC 20V MAX* Circular Saw offers superior performance and features, making it the better choice for serious users, while the Ryobi P506 is a budget-friendly option for occasional tasks.

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

Performance

Higher RPM and cutting capacity

Features

Includes electronic blade brake and on-board storage

Build Quality

Brushless motor enhances efficiency and runtime

Why Ryobi P506 One+ Lithium Ion 18V 5 1/ is better

Price

Significantly cheaper at $69.00

Weight

Lighter and easier to handle

Battery Compatibility

Works with all Ryobi 18V batteries

Overall score

DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool Only
85
Ryobi P506 One+ Lithium Ion 18V 5 1/
65

Specifications

SpecDEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool OnlyRyobi P506 One+ Lithium Ion 18V 5 1/
Motor TypeBrushlessBrushed
Laser GuideNoYes
Bevel Capacity45 degrees50 degrees
Auxiliary HandleYesNo
Electronic BrakeYesNo
Warranty3 years3 years

Dimension comparison

DEWALT ATOMIC 20V MAX* Circular Saw, 4-1/2-Inch, Tool OnlyRyobi P506 One+ Lithium Ion 18V 5 1/

Overview of the DEWALT ATOMIC 20V MAX* Circular Saw

The DEWALT ATOMIC 20V MAX* Circular Saw is designed for those needing a compact and powerful tool. Priced at $159.00, it features a brushless motor capable of cutting up to 369 linear feet of 3/4 in. OSB when used with a compatible battery. This tool is part of the ATOMIC COMPACT SERIES, making it a versatile option for various applications. With its unique bevel gear design, it allows for precise cuts in both 2x and 1x materials at different angles, ensuring that it meets the demands of professional and DIY projects alike.

Overview of the Ryobi P506 One+ Circular Saw

The Ryobi P506 One+ Circular Saw stands out with a price of $69.00, making it about 57% cheaper than the DEWALT model. This saw is equipped with a 5-1/2 in. blade and operates at 4,700 revolutions per minute, offering efficient cutting capabilities. Its integrated laser guide enhances cutline visibility, which can be particularly beneficial for accuracy. Designed to work with all Ryobi 18-Volt ONE+ batteries, it provides a good entry point for users already invested in the Ryobi ecosystem.

Cutting Performance and Features

In terms of cutting performance, the DEWALT ATOMIC Circular Saw offers significant advantages with its brushless motor, which not only enhances efficiency but also extends the runtime with a compatible battery. The ability to cut up to 369 linear feet of 3/4 in. OSB is impressive and reflects its suitability for heavy-duty tasks. On the other hand, the Ryobi P506, while having a slightly larger blade diameter, operates at a lower RPM and is limited to a depth of cut of 1-9/16 in. This difference in cutting depth and RPM could affect performance in more demanding applications.

Design and Ergonomics

When comparing design and ergonomics, both saws offer features catering to user comfort and control. The DEWALT model includes a removable auxiliary handle and a hang hook for added convenience. Its 1-1/2 in. finger trigger allows for better control during use. Conversely, the Ryobi saw is designed with GRIPZONE overmold, which provides a comfortable grip. The angled cuts up to 50 degrees with the Ryobi may appeal to users needing flexibility in their cutting angles, but the DEWALT saw's bevel lever allows for precise angle adjustments as well.

Convenience Features

Convenience features play a critical role in usability. The DEWALT saw includes an on-board blade key storage, which makes blade changes hassle-free, alongside an electronic blade brake that enhances safety by stopping the blade quickly. The Ryobi P506, while lacking some of these advanced features, compensates with its integrated laser guide that provides enhanced visibility for cuts. This laser feature can significantly help with accuracy, especially for beginners.

Battery and Compatibility

Battery compatibility is another crucial factor. The DEWALT ATOMIC Circular Saw operates on 20V MAX batteries, which are known for their efficiency and longevity. However, the battery is sold separately, which adds to the overall cost. In contrast, the Ryobi P506 is part of the ONE+ System, meaning it can work with any Ryobi 18-Volt battery, making it a more versatile option for users already within the Ryobi ecosystem. This could save users money if they already own compatible batteries.

Price Comparison

The price difference between the two saws is substantial. The DEWALT ATOMIC 20V MAX* Circular Saw is priced at $159.00, while the Ryobi P506 is significantly cheaper at $69.00. This makes the Ryobi about 57% less expensive than the DEWALT model, which could be a deciding factor for budget-conscious consumers or those who only need a saw for occasional use.

Which should you buy?

Deciding between the DEWALT ATOMIC 20V MAX* Circular Saw and the Ryobi P506 boils down to your specific needs. If you require a high-performance tool for professional or frequent use, the DEWALT offers superior cutting capabilities, a brushless motor, and advanced features, although at a higher price. Conversely, if you're looking for a more economical option for lighter tasks or are already invested in the Ryobi battery system, the Ryobi P506 provides excellent value. Ultimately, both saws cater to different segments of users, making your choice dependent on your budget and intended use.