- Bevel cut capacity of 0° to 56°
- Includes: Blade and Blade Wrench
- Over 175 ONE+ Tools – All Work With Any RYOBI ONE+ 18V Battery
- See More Details
Frequently Bought Together
Product Overview
18-Volt Battery Platform
No matter your interests or skill level, we can power it. With cordless lithium-ion technology, RYOBI can power you through all types of projects from drilling, driving, cutting, and fastening, to lighting, plumbing, cooling, and rocking, to trimming, edging, mowing, and clearing – and so much more.
World’s Largest 18V Tool System
RYOBI gives you the ultimate in versatility and selection to get the job done. From household tasks to the jobsite to recreation and everything in between, there is a ONE+ product for you.
RYOBI ONE+
RYOBI has never changed – and will never change – the 18V ONE+ battery platform, meaning our newest products & batteries fit the original RYOBI tools and batteries from 1996. RYOBI ONE+ is the system that delivers more.
Brushless Motor
Brushless motor technology provides longer runtime, more power, and a longer motor life.
LITHIUM+HP Battery Technology
Pair brushless power tools with LITHIUM+HP batteries for optimum power, runtime, torque, and speed.
Tool & Battery Communication
The High Performance (HP) terminals on our LITHIUM+HP batteries allow the tool and battery to communicate and deliver peak performance.
Premium Performance
Unleash the full power of your brushless power tools. HP communication technology paired with brushless tools maximizes performance in all applications.
RYOBI ONE+
Put the power of 18V ONE+ at your fingertips from the cordless system that delivers more.
18V Lithium
Lithium-ion battery technology with fade-free power and Extreme Weather Performance to withstand the toughest conditions.
3 Year Limited Warranty
RYOBI Portable Power Tools and Bench/Stationary tools purchased on or after 1.1.11 are covered by a 3-year warranty.
World’s Largest
The RYOBI 18V ONE+ System gives you the ultimate in versatility and selection.
100% Compatible
All RYOBI 18V tools and batteries are 100% forwards and backwards compatible. Any RYOBI 18V tool works with any of our 18V batteries.
90 Day Guarantee
Buy with confidence with our 90 day no-risk satisfaction guarantee.
- 26% increased cut capacity
- Brushless motor provides longer runtime, more power, and longer motor life
- LED light illuminates cutline, eliminating shadows for a precise cut line view
- Full-size 7-1/4 in. blade for maximum cut capacity and blade variety
- Spindle lock for quick and easy blade changes
- 24-Tooth ultra thin kerf carbide-tipped blade for fast, clean cuts
- Compatible with LITHIUM+ HP batteries for even better performance
- GRIPZONE overmold with microtexture for optimum grip and user comfort
- 0°-56° bevel cut capacity allows user the ability to cut the most common and complex angles
- Left-mount blade and dust blower for maximum cutline visibility
- On-board wrench storage for fast, convenient, blade changes
- Front pommel handle with overmold for 2-handed operation
- Ergonomic design increases user comfort during prolonged use
- Part of the RYOBI ONE+ System of over 175 Cordless Tools
- 3-year manufacturer's warranty
- Includes: (1) P508 18-Volt ONE+ Brushless 7-1/4 in. Circular Saw, (1) 7-1/4 in. 24-teeth ultra thin kerf carbide-tipped blade, (1) blade wrench, and operator's manual
- Battery and charger sold separately
- Click here for more information on Electronic Recycling Programs
- California residents
Info & Guides
Compare Similar Circular Saws
Top Rated |  | Top Rated | Exclusive | |
| Brand | RYOBI | DEWALT | DEWALT | RYOBI |
| Name | 18-Volt ONE+ Cordless 6-1/2 in. Circular Saw (Tool Only) | 15 Amp Corded 7-1/4 in. Lightweight Circular Saw | 20-Volt MAX Cordless 6-1/2 in. Circular Saw (Tool-Only) | 18-Volt ONE+ Cordless Brushless 7-1/4 in. Circular Saw (Tool Only) |
| Price | ||||
| Ratings | (1729) | (544) | (7687) | (1237) |
| Cordless/ Corded | Cordless | Corded | Cordless | Cordless |
| Blade Diameter | 6-1/2 | 7-1/4 | 7-1/4 | |
| Power Tool Features | Depth Adjustment,Keyed Blade Change | Depth Adjustment,Keyed Blade Change | Keyless Blade Change,Spindle Lock | Depth Adjustment,Electric Brake,Keyed Blade Change,Spindle Lock |
| Voltage (volts) | 18 | 20 | 18 | |
| Batteries Included | No | No | No | |
| Blade Diameter (in.) | 6-1/2 | 7-1/4 | 6-1/2 | 7-1/4 |
| Saw Drive Type | Sidewinder | Sidewinder | Sidewinder | Sidewinder |
| Blade Location | Left | Right | Left | Left |
| Battery Amp Hours | No Battery | No Battery | No Battery | |
| View Product | View Product | View Product | View Product |
Compare Similar Circular Saws
| Top Rated | | Top Rated | Exclusive | |
| Brand | RYOBI | DEWALT | DEWALT | RYOBI |
| Name | 18-Volt ONE+ Cordless 6-1/2 in. Circular Saw (Tool Only) | 15 Amp Corded 7-1/4 in. Lightweight Circular Saw | 20-Volt MAX Cordless 6-1/2 in. Circular Saw (Tool-Only) | 18-Volt ONE+ Cordless Brushless 7-1/4 in. Circular Saw (Tool Only) |
| Price | ||||
| Ratings | (1729) | (544) | (7687) | (1237) |
| Cordless/ Corded | ||||
| Blade Diameter | ||||
| Power Tool Features | ||||
| Voltage (volts) | ||||
| Batteries Included | ||||
| Blade Diameter (in.) | ||||
| Saw Drive Type | ||||
| Blade Location | ||||
| Battery Amp Hours | ||||
| View Product | View Product | View Product | View Product |
Specifications
Dimensions
Details
Warranty / Certifications
Questions & Answers
lever for height adjustment is loose and the shoe won't stay light when I cut a 2x4.
Asked by Denver March 28, 2021Denver, thank you for your interest in the RYOBI 18-Volt ONE+ Cordless Brushless 7-1/4 in. Circular Saw. If the foot of the saw will not stay in place you may need to take the saw in for repair. If you are still within your 90 day exchange window, you could do an exchange for a saw that is not acting this way. Thank you for asking, If you have further questions and would like to speak with a RYOBI Customer Experience Professional, please call, 1-800-525-2579 M-F from 9am-6pm EST. Hope this helps! - Vini
what is the rpm for this saw?
Asked by pdogg February 9, 2021check the specification of the tools you will find it.
How does thisvsaw compare to ryobi cordless hp th black accented cersion
Asked by Joe January 27, 2021Joe, 18-Volt ONE+ Cordless Brushless 7-1/4 in. Circular Saw. The main difference between this model and the the new brushless HP model is that the HP model one is designed with the HP system. This means you will get more performance out of your battery. Thank you for asking, If you have further questions and would like to speak with a RYOBI Customer Experience Professional, please call, 1-800-525-2579 M-F from 9am-6pm EST. Hope this helps! - Vini
Does Ryobi make this saw for left handed people? If so, how do I order it and is there a model number you can share
Asked by Francesco January 10, 2021I would expect it can be operated by both left and right handed people. The lock-off button can be depressed from either side of the handle. Now, if you are asking if there is a version with a right mounted blade, I am not aware of one.
how to install a blade
Asked by bill January 9, 2021Great question Bill. For instructions on installing the blade on the RYOBI 18-Volt ONE+ Cordless Brushless 7-1/4 in. Circular Saw (Tool Only) P508 please see page 6 headed Attaching the Blade in the Use and Care Manual. I am enclosing a URL link for the manual below. I hope this helps. If you need further assistance with this question, please contact RYOBI Customer Support directly at 1-800-525-2579, Monday thru Friday, 9am to 6pm EST and follow the prompts for Technical Support. Thanks for contacting RYOBI! - Eve
Excited to use new saw. Charged battery, installed it, and ready to go. Unlock the button and pus...
Asked by Hank January 9, 2021Hello Hank, Thanks for choosing the RYOBI 18-Volt ONE+ Cordless Brushless 7-1/4 in. Circular Saw (Tool Only) P508. The lock-off button is located on the handle above the switch trigger. The lock-off button must be depressed before you pull the switch trigger. The lock resets each time the trigger is released. Make sure you have a fully charged battery. If you find that these troubleshooting tips do not assist you, please contact RYOBI Customer Support directly at 1-800-525-2579, Monday thru Friday, 9am to 6pm EST and follow the prompts for Technical Support. Thanks for contacting RYOBI! - Eve
Has Ryobi addressed the Reports/Reviews of the Saw Guide on the P508 not Parallel to the Blade?
Asked by Steven622 December 28, 2020No. Frustrating isn't it. I moved a washer in the depth slide assembly and it improved the amount more than expected. See where the pen is pointing in the photo. Was on the right hand side of the slide originally. Could make or put in another washer as well. I have not yet cut anything with it after making this change as I got side tracked but it measures to about .015" difference front to back on mine. I should have gotten a precise before measurement instead of just after. But I am not changing it back now.
Will this cut a 4x4?
Asked by Anthony November 29, 2020At 0 degrees, it has a depth cut of 2” 7/16. If you make a cut on both sides of the four by 4, you should be able to cut it completely
Does it have a dust port
Asked by Kaj November 27, 2020Great question Kaj, The RYOBI 18-Volt ONE+ Cordless Brushless 7-1/4 in. Circular Saw (Tool Only) P508 does not come with a dust port. Thanks for your inquiry! - Eve
Does anyone know if this saw will also work with the 40v Ryobi batteries?
Asked by gmc November 16, 2020No it will not work with 40volt batteries. 18 volt only is all you need to get the job done!
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