BLACK+DECKER 20V 5-1/2" Cordless Circular Saw, vs Ryobi P506 One+ Lithium Ion 18V 5 1/
Updated July 2026 — BLACK+DECKER 20V 5-1/2" Cordless Circular Saw, wins on rank and price, Ryobi P506 One+ Lithium Ion 18V 5 1/ wins on rpm and bevel.
The Ryobi P506 offers better cutting speed and is more affordable, making it a strong choice for budget-conscious users. However, the BLACK+DECKER excels in tool-free adjustments.
Why BLACK+DECKER 20V 5-1/2" Cordless Circular Saw, is better
Tool-Free Features
BLACK+DECKER offers tool-free depth adjustment and blade changes.
Brand Reputation
BLACK+DECKER is a well-respected brand in the power tool industry.
Compact Design
BLACK+DECKER emphasizes a compact design for ease of use.
Why Ryobi P506 One+ Lithium Ion 18V 5 1/ is better
Price
Ryobi is priced at $69.00, making it 8% cheaper.
Cutting Speed
Ryobi operates at 4,700 RPM for faster cutting.
Bevel Capacity
Ryobi offers a 50-degree bevel cut capacity for versatility.
Overall score
Specifications
| Spec | BLACK+DECKER 20V 5-1/2" Cordless Circular Saw, | Ryobi P506 One+ Lithium Ion 18V 5 1/ |
|---|---|---|
| Blade Size | 5-1/2 inch | 5-1/2 inch |
| Depth of Cut | 1-5/8 inch | 1-9/16 inch |
| Laser Guide | No | Yes |
| Tool-Free Change | Yes | No |
| Battery System | POWERCONNECT | ONE+ |
Dimension comparison
Price Comparison
The BLACK+DECKER 20V 5-1/2" Cordless Circular Saw is priced at $74.99, while the Ryobi P506 One+ Lithium Ion 18V model is slightly cheaper at $69.00. This makes the Ryobi about 8% less expensive than the BLACK+DECKER. Both options are competitive within the market, but if price is your primary concern, the Ryobi offers a more economical choice without sacrificing essential features. However, it's important to consider other factors beyond just the initial cost when making a decision.
Cutting Performance
Both circular saws feature a 5-1/2 inch blade, but they differ in their performance specifications. The Ryobi operates at an impressive 4,700 revolutions per minute, which can translate to faster cutting times for various tasks. In contrast, the BLACK+DECKER does not specify its RPM, but it boasts a high torque motor, which may provide strong cutting performance. The integrated laser guide on the Ryobi enhances cutline visibility, making it easier to achieve precision in your cuts. Thus, if cutting speed and accuracy are top priorities, the Ryobi may have an edge.
Versatility in Cuts
When it comes to versatility, the BLACK+DECKER offers level detents for angled cuts at 45 and 90 degrees, allowing for a range of DIY tasks. The Ryobi, on the other hand, provides a 50-degree bevel cut capacity, which offers even more flexibility for angled cuts. This feature could be particularly beneficial for users looking to tackle diverse projects. Therefore, while both tools excel in making angled cuts, the Ryobi slightly edges out in versatility with its broader range of bevel cuts.
Ease of Use
Both the BLACK+DECKER and Ryobi circular saws prioritize user convenience, but they do so in slightly different ways. The BLACK+DECKER features tool-free depth adjustment and blade changes, making it easy to make quick modifications without needing extra tools. Similarly, the Ryobi's GRIPZONE overmold provides optimal grip and comfort during use. Each tool is designed to minimize hassle, but the BLACK+DECKER may have a slight advantage with its enhanced tool-free features, making adjustments quicker for users.
Battery Compatibility
Battery compatibility is a critical factor for users with multiple tools. The BLACK+DECKER utilizes a 20V MAX* POWERCONNECT battery, which is interchangeable with other tools in the POWERCONNECT system. Meanwhile, the Ryobi is part of the ONE+ system, which is designed to work with all 18-Volt batteries in that lineup. If you already own tools from either system, this could significantly influence your choice. However, if you're starting fresh, consider which brand's battery ecosystem aligns better with your future tool purchases.
Design and Build Quality
Both circular saws are designed with user comfort in mind, but they exhibit different aesthetics and build features. The BLACK+DECKER emphasizes a compact design for ease of use, while the Ryobi incorporates a laser guide for enhanced visibility and precision during cuts. While the BLACK+DECKER's design focuses on portability and control, the Ryobi's use of a laser guide may appeal to those who prioritize accuracy. Ultimately, your preference in design may depend on whether you value a compact feel or added visibility during cuts.
Brand Reputation and Sales Rank
In terms of brand reputation, both BLACK+DECKER and Ryobi are well-respected in the power tool industry. The BLACK+DECKER circular saw has a sales rank of 102,120, while the Ryobi sits slightly higher at 100,142. Although the difference is minimal, a lower sales rank can suggest a higher demand or popularity. When choosing between the two, consider the reputation of the brands and their respective histories in producing reliable tools, as this can affect your long-term satisfaction with the product.
Which should you buy?
Deciding between the BLACK+DECKER 20V 5-1/2" Cordless Circular Saw and the Ryobi P506 One+ Lithium Ion 18V model ultimately depends on your specific needs. If price is the primary concern, the Ryobi is about 8% cheaper and offers a higher RPM for faster cutting. However, if you value tool-free adjustments and a robust battery system, the BLACK+DECKER may be the better choice. Both saws have their strengths, but your choice should align with the features that matter most for your projects.

