Which is better for building a deck?

The DCK521D2, because it adds a 6-1/2 in circular saw for cutting boards. The DCK227D2 only drills and drives, so you would buy a saw separately.

Which has more power?

The DCK227D2 impact driver, at 1,700 in-lbs against 1,400 in-lbs on the DCK521D2. Its brushless motor also runs cooler and lasts longer per charge.

Is the five-tool kit worth the extra money?

Only if you need the saw and grinder. At $669 versus $169 as of November 4, 2026, you pay about $500 more for three extra tools and brushed motors.

Do they use the same batteries?

Yes. Both run on the DEWALT 20V MAX platform and each ships with two 2.0Ah batteries and a charger, so packs interchange.

The DCK227D2 has brushless motors with no brushes to wear out, so its drill and impact driver should outlast the brushed tools in the DCK521D2.

Which is easier to carry around?

The DCK227D2. It is two compact tools in a contractor bag, while the DCK521D2 kit weighs 24.5 lbs with five tools.

DeWALT DCK521D2 20V Max Compact Cordless 5-Tool Combo Kit vs DeWalt dck227d2 20V MAX Brushless 2-Tool Combo Kit

Buy the DCK227D2 two-tool kit if you need a drill and impact driver. It costs $169 at Lowe's as of November 4, 2026, against $669 at Home Depot for the DCK521D2 five-tool kit. Buy the five-tool kit only if you need a circular saw and grinder in the same battery platform and can absorb the $500 gap.

Today the DeWalt dck227d2 20V MAX Brushless 2-Tool Combo Kit costs $280.95 less at its best price.

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