DEWALT DCS391B Saw
- Saw
- 6.5 inches
- Battery
- High Speed Steel
- More reviewed than 98%
A 20V cordless circular saw with a 6.5-inch blade and 5,100 RPM no-load speed, best suited to buyers already invested in the DeWalt 20V battery platform.
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How it ranks among the 265 saws we track
4.6★ across 11,000 Amazon ratings, Bayesian-smoothed toward the category average.
11,000 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
2,000+ bought on Amazon last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 265 saws we track - how the scorecard works · full saws data report. Confidence: high - strong rating volume and complete data.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The DEWALT DCS391B is a 20-volt cordless circular saw with a 6.5-inch blade capacity and a no-load speed of 5,100 RPM, weighing 3.16 kilograms. The high speed steel spec listed refers to the blade material rather than the saw body.
This model is part of DeWalt's 20V MAX cordless lineup, built around a 6.5-inch blade rather than the more common 7.25-inch size, which trims weight for one-handed cutting. The B in the model number typically marks a bare tool listing, sold without battery or charger, so buyers who do not already own compatible DeWalt 20V batteries will need to add them separately.
- 20V MAX cordless platform
- 6.5-inch blade capacity
- 5,100 RPM no-load speed
- 3.16 kg tool weight
Who it's for
Good for a DeWalt 20V battery owner who wants a lighter cordless saw for general framing and sheet goods around the house or jobsite. Not a fit for someone without existing DeWalt 20V batteries and a charger, since those are not included based on the bare-tool model number.
Strengths and trade-offs
Drawn from this product's published specifications.
- 20V cordless mobility
- Lighter 6.5-inch blade for easier one-handed use
- 5,100 RPM no-load speed
- Bare tool, no battery or charger included
- Smaller blade than full-size 7.25-inch circular saws
Performance notes
At 5,100 RPM no-load speed and a 6.5-inch blade capacity, this saw is built for general cutting in dimensional lumber and sheet goods, with the smaller blade size keeping the tool lighter at 3.16 kilograms than full-size 7.25-inch circular saws. As a bare tool, actual run time depends on the battery paired with it.
Specifications
| Brand | DeWALT |
|---|---|
| Model | DCS391B |
| Dimensions & fit | |
| Item Weight | 6.97 pounds |
| Capacity & performance | |
| Capacity | 6.5 inches |
| Speed | 5100 rpm |
| Power & efficiency | |
| Power Source | Battery |
| Voltage | 20 volts |
| Construction & materials | |
| Material | High Speed Steel |
Other DeWALT saws
How it compares
This product against the closest alternatives we track in saws.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| DEWALT DCS391B SawThis product | 4.6 / 5 | 11,000 | 4.6 / 5 |
| DEWALT DCS334B SawDeWalt | 4.8 / 5 | 9,477 | 4.7 / 5 |
| SKIL 5280-01 SawSkil | 4.7 / 5 | 14,300 | 4.6 / 5 |
| Milwaukee 2719-20 SawMILWAUKEE | 4.8 / 5 | 6,485 | 4.5 / 5 |
| BLACK+DECKER BDEJS600C SawBLACK+DECKER | 4.7 / 5 | 11,123 | 4.5 / 5 |
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Questions about the DeWALT DCS391B
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the DCS391B include a battery?
No, the B in the model number denotes a bare tool sold without battery or charger.
What blade size does it use?
6.5 inches.
What is the no-load speed?
5,100 RPM.