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DEWALT DCS391B vs RYOBI P505

Our Best Overall vs our Best Budget cordless circular saws — is the upgrade worth it?

The short answer

The DEWALT DCS391B costs $70.01 more (163% more) than the RYOBI P505 — $113 vs $42.99. On the features we score, the Best Overall adds nothing the budget pick lacks.

Buyers rate them 4.6 vs 4.6 stars, and the DEWALT DCS391B has more reviews behind its rating (11,173 vs 3,554). On our 100-point scale that works out to 79 vs 75.

Bottom line: if you'll use it often, the DEWALT DCS391B is worth the $70.01. For occasional jobs around the house, the RYOBI P505 does the work for less.

Price no object? Our pick is the DEWALT DCS590B ($184) — see why on the full ranking.

Side by side

DEWALT DCS391B
Best Overall
RYOBI P505
Best Budget
Price$113$42.99
Rating 4.6 4.6
Reviews11,1733,554
Our score79/100 (#1)75/100 (#2)
Bought on Amazon2K+/mo500+/mo
TypeCordlessCordless
Battery20V MAX18V ONE+
Blade6-1/2 in5-1/2 in
Speed5,150 rpm4,700 rpm
Bevel0-50°0-50°
Weight——
KitNoNo
BrakeNoNo
LaserNoNo
High bevelYesYes

Prices, ratings and review counts captured from Amazon on 2026-09-21; prices change often.

Best Overall
DEWALT DCS391B 20V MAX 6-1/2" Circular Saw (tool only)
DEWALT

DEWALT DCS391B 20V MAX 6-1/2" Circular Saw (tool only)

The best-selling cordless saw here by a mile — 11,000+ reviews at 4.6 stars. Fast, well-balanced, and it rides the huge DEWALT 20V MAX platform. It's a bare tool, so you'll need a battery.

Choose it for

  • 11,173 reviews at 4.6 stars — the proven pick
  • 5,150 rpm, 0-50° bevel
  • Runs on the massive DEWALT 20V MAX lineup

Watch out for

  • Tool only — no battery or charger
  • 6-1/2" blade cuts shallower than a 7-1/4"
Check today's price →
Best Budget
RYOBI ONE+ P505 18V 5-1/2" Circular Saw (tool only)
RYOBI

RYOBI ONE+ P505 18V 5-1/2" Circular Saw (tool only)

The cheapest way into a cordless saw — if you're on RYOBI ONE+. The 5-1/2" blade is light and handy for plywood, trim, and breaking down sheet goods. A bare tool, so grab a ONE+ battery.

Choose it for

  • Cheapest name-brand cordless saw here
  • Light and easy at 5-1/2", 4.6 stars
  • Huge RYOBI ONE+ 18V ecosystem

Watch out for

  • Tool only — no battery or charger
  • 5-1/2" blade limits cut depth
Check today's price →

Quick answers

Is the DEWALT DCS391B worth the extra money over the RYOBI P505?

The DEWALT DCS391B costs $70.01 more (163% more) than the RYOBI P505 — $113 vs $42.99. On the features we score, the Best Overall adds nothing the budget pick lacks. Bottom line: if you'll use it often, the DEWALT DCS391B is worth the $70.01. For occasional jobs around the house, the RYOBI P505 does the work for less.

Which has better reviews, the DEWALT DCS391B or the RYOBI P505?

The DEWALT DCS391B is rated 4.6 stars from 11,173 reviews; the RYOBI P505 is rated 4.6 stars from 3,554 reviews.

What is the best cordless circular saws pick overall?

Our Best Overall is the DEWALT DCS391B (score 79/100), ranked against 9 other cordless circular saws on rating, review volume and features.

See the full top 10

These two are picked from a ranking of 10 cordless circular saws, scored on star rating, review volume and the features that matter for the job. See all 10 and the one to avoid →

More head-to-heads