Dong Cheng 20V MAX 7-1/4'' Brushless Cordless vs Ryobi One P505 18V Lithium Ion Cordless 5 1/2"
Updated July 2026 — Dong Cheng 20V MAX 7-1/4'' Brushless Cordless wins on dust control and power, Ryobi One P505 18V Lithium Ion Cordless 5 1/2" wins on price.
The Dong Cheng offers superior power and features, making it ideal for heavy-duty tasks, while the Ryobi is a budget-friendly option for light use.
Why Dong Cheng 20V MAX 7-1/4'' Brushless Cordless is better
Power
850W brushless motor vs 18V motor
Cutting Depth
65mm at 90° vs 45mm
Dust Management
Integrated dust port vs no feature
Why Ryobi One P505 18V Lithium Ion Cordless 5 1/2" is better
Price
$44.89 vs $96.59
Weight
Lightweight design for casual use
Ease of Use
Extra side handle for control
Overall score
Specifications
| Spec | Dong Cheng 20V MAX 7-1/4'' Brushless Cordless | Ryobi One P505 18V Lithium Ion Cordless 5 1/2" |
|---|---|---|
| Motor Type | Brushless | Brushed |
| RPM | 5000 | 4700 |
| Blade Size | 7-1/4" | 5-1/2" |
| Bevel Angle | 0-45° | 0-50° |
| Battery Included | Yes | No |
Dimension comparison
Overview of the Dong Cheng and Ryobi Circular Saws
The Dong Cheng 20V MAX 7-1/4" Brushless Cordless Circular Saw Kit is priced at $96.59, while the Ryobi One P505 18V Lithium Ion Cordless Circular Saw is more economical at $44.89, making it about 53% cheaper. Both saws are designed for portability and efficiency, catering to different user needs in woodworking and DIY projects. The Dong Cheng model is more advanced with its brushless motor and higher RPM, while the Ryobi offers a solid entry-level option for casual users or those needing a backup tool.
Performance Comparison
In terms of performance, the Dong Cheng model stands out with its 850W brushless motor, which allows for a speed of 5000 RPM, enabling it to slice through various materials like hardwood and PVC with ease. In contrast, the Ryobi One P505 operates at a lower 4700 RPM, but it still delivers powerful performance suitable for household woodcutting tasks. The difference in motor power and RPM indicates that the Dong Cheng is better suited for heavy-duty applications, whereas the Ryobi excels in light to moderate cutting tasks.
Blade and Cutting Capacity
The Dong Cheng saw features a 7-1/4" blade that allows for a cutting depth of 65mm at 90° and 45mm at 45°, making it ideal for framing and renovation projects. The inclusion of both 24T and 40T blades provides versatility for different cuts. The Ryobi, on the other hand, has a 5-1/2" blade, which limits its cutting capacity compared to the Dong Cheng. This difference in blade size and cutting depth makes the Dong Cheng more advantageous for users who require precision in thicker materials.
Design and Ergonomics
Both saws are designed with user comfort in mind, but they cater to different user preferences. The Dong Cheng features an anti-slip grip and a balanced body design to minimize arm fatigue during prolonged use. It is also lightweight at 3.8kg, allowing for easier overhead cutting and mobility. Conversely, the Ryobi has a rubber grip that enhances handling and an extra side handle for improved control and visibility during cutting. While both designs aim for user-friendliness, the Dong Cheng may be better for those needing extended use without fatigue.
Dust Management
Dust management is a crucial factor in maintaining a clean workspace, and both circular saws have solutions for this. The Dong Cheng saw includes an integrated dust port that connects to vacuums or sawdust bags, which helps keep the cutting area clear and improves visibility during operation. The Ryobi does not specifically mention a dust collection feature, which could result in more cleanup time after use. For users who prioritize a tidy work environment, the Dong Cheng offers a clear advantage in this category.
Battery and Compatibility
When it comes to battery performance and compatibility, the Dong Cheng comes with a 20V 4.0Ah Lithium-ion battery and charger, enhancing its value as a complete kit. Its interchangeable battery can also power other tools in the Dong Cheng lineup, providing versatility for users with multiple tools. The Ryobi, while compatible with a range of 18V batteries from the One+ series, does not include a battery with the tool, which can be an added expense for users who do not already own Ryobi batteries. This makes the Dong Cheng a more convenient option for those starting fresh.
Price Point Analysis
The pricing of the two models reflects their capabilities and target audiences. With the Dong Cheng priced at $96.59 and the Ryobi at $44.89, the Ryobi is significantly cheaper—about 53% less. However, this lower price also comes with trade-offs in power and features. The Dong Cheng, while more expensive, offers a more robust tool for serious woodworking tasks, making it a worthwhile investment for professionals or dedicated DIYers. For casual users or those needing a tool for light tasks, the Ryobi remains an attractive option due to its lower entry cost.
Which should you buy?
Ultimately, the choice between the Dong Cheng 20V MAX Circular Saw and the Ryobi One P505 depends on your specific needs. If you require a powerful, versatile, and feature-rich tool for heavy-duty applications, the Dong Cheng is the superior choice despite its higher price. However, if you're looking for an economical and reliable option for light to moderate cutting tasks around the house, the Ryobi offers excellent value for money. Each saw has its strengths, so consider your intended use carefully before making a decision.

