Walk into any tool aisle and the two most common boxes are a cordless drill and an impact driver, often sold together as a combo kit for the price of one premium tool. They look almost identical from across the room but they are mechanically different machines that solve different problems. New DIYers regularly buy the wrong one first, then either return it or struggle through a project with a tool that was not designed for the task. Here is how the two actually differ, when each one shines, and which one belongs in your first kit.
How a cordless drill works
A drill has a three-jaw chuck (usually 3/8 inch or 1/2 inch capacity) that clamps any round-shank or hex-shank bit. The motor turns the chuck through a planetary gearbox with a selectable speed (low for torque, high for drilling) and a slip clutch that lets you set a torque limit before the bit stalls or strips a screw. Output is smooth and continuous, which is what you need for drilling clean holes.
Typical numbers for a mid-range 18V brushless drill in 2026:
- Max torque: 600 to 800 inch-pounds
- High-speed range: 1800 to 2100 RPM
- Low-speed range: 400 to 550 RPM
- Chuck: 1/2 inch keyless
- Weight bare tool: 2.6 to 3.4 pounds
The clutch is the underrated feature. Set it to 8 or 10 and the drill will stop driving the moment the screw is flush, which prevents stripping cabinet screws or sinking drywall screws too deep.
How an impact driver works
An impact driver has a fixed 1/4 inch hex collet (not a chuck) that quick-releases hex-shank bits. The motor spins the anvil through a spring-loaded hammer that, when load exceeds a threshold, starts striking the anvil rotationally hundreds of times per second. The result is short bursts of very high peak torque that drive long fasteners without bogging down and without transmitting reactive twist into your wrist.
Typical numbers for a mid-range 18V brushless impact driver in 2026:
- Max torque: 1700 to 2200 inch-pounds
- Max RPM: 2900 to 3600
- Impacts per minute: 3600 to 4400
- Collet: 1/4 inch hex quick-release
- Weight bare tool: 2.2 to 2.8 pounds
It is shorter than a drill (no chuck, no clutch) which helps in tight spaces between studs. The trade is that it cannot run slowly under control. Tap the trigger lightly and it either creeps or jumps to full impact, which makes precision pilot holes difficult.
Where the drill wins
- Drilling holes in wood, metal, plastic, or thin masonry up to about 1/2 inch
- Anything requiring a round-shank bit: hole saws, forstner bits, spade bits over 1/2 inch, brad-point bits, step bits
- Mixing thinset, paint, or drywall mud with a paddle attachment
- Pilot holes where speed and depth control matter
- Driving fasteners short enough that you want the clutch to stop you (cabinet hinges, hardware, drawer pulls)
- Hammer-drill versions handle masonry up to about 1/2 inch in concrete
Where the impact driver wins
- Driving long screws (deck screws, lag screws, structural screws over 3 inches)
- Removing rusted or seized fasteners
- Driving fasteners overhead or in awkward positions where you cannot brace against the drill’s reactive torque
- Assembling decks, fences, sheds, or framing with hundreds of screws
- Anywhere you would otherwise need a socket wrench, with an impact-rated socket adapter
- Stripping fewer Phillips heads (the impact mechanism reduces cam-out)
The torque myth
Marketing leans hard on impact torque numbers, and the headline figures are real, but they describe peak rotational impacts, not sustained torque. A 2000 inch-pound impact driver will not drill a 2 inch hole through a beam, because the bit binds before the hammer mechanism engages. A 700 inch-pound drill running on low gear will plow through the same hole all day. Match the tool to the work.
When you need both
The honest answer for anyone tackling a deck, a shed, a fence, or a full furniture build is both. A drill stays loaded with the pilot-hole bit, the impact stays loaded with the driver bit, and you switch hands instead of swapping bits 200 times. This is why combo kits are so popular and why the math almost always favors the kit over a single premium tool plus a second tool bought later.
A typical 2026 combo kit pricing:
- DeWalt 20V Max Brushless Combo (DCK277C2): 199 dollars with two 1.5Ah batteries and charger
- Milwaukee M18 Brushless Combo (3697-22): 249 dollars with two 2.0Ah batteries
- Ryobi 18V One+ HP Brushless Combo: 159 dollars with two 2.0Ah batteries
- Bosch 18V Brushless Combo: 199 to 229 dollars
Pay particular attention to whether the combo includes brushless motors. Brushless adds about 30 to 40 dollars to the kit price but adds roughly 50 percent to runtime per battery and doubles the brush life, and the difference shows up after the first heavy project.
The cheapest path to a working kit
If your budget is tight, the order that gives you the most capability per dollar is:
- Brushless drill plus impact combo kit (159 to 220 dollars)
- A 30-piece hex-shank drill and driver bit set (15 to 25 dollars)
- A spare 4.0Ah battery once the included 1.5Ah or 2.0Ah feels short (40 to 70 dollars)
- Optional: a hammer-drill upgrade later if you do masonry
That covers maybe 90 percent of household DIY for under 250 dollars. Spend the next 50 dollars on a 6 inch random-orbit sander and a contractor measuring tape and you have a complete starter shop.
The mistake most new DIYers make
Buying a single high-end drill instead of a budget combo. A 200 dollar premium drill is no faster, no stronger, and no longer-lasting on a deck build than a 100 dollar drill paired with a 100 dollar impact driver. The combo finishes the job in half the time because you stop swapping bits. Spend on the second tool first. Spend on the better tool later when you actually know which features you use.
For a full breakdown of cordless platforms and battery compatibility across brands, see our methodology page for how we evaluate cordless tools.
Frequently asked questions
Can an impact driver replace a drill?+
For 80 percent of common household tasks like driving deck screws, assembling furniture, or building shelves, yes. Where it fails is anything that needs a round-shank bit, like brad-point wood bits over 3/8 inch, hole saws, spade bits, mixing paddles, and most masonry bits. It also struggles with precision pilot holes because it cannot run at very low controlled RPM.
Why does an impact driver only take hex shank bits?+
The 1/4 inch hex collet is a quick-release design that locks the bit axially so the rotational hammering does not eject it. Round-shank chucks would slip under impact load. You can buy 1/4 inch hex-shank twist bits up to about 1/2 inch diameter but the selection is limited and they cost roughly twice the equivalent round-shank bit.
Which has more torque, a drill or an impact driver?+
An impact driver delivers far more peak torque, typically 1500 to 2200 inch-pounds versus 400 to 800 for a comparable drill. But the drill applies its torque continuously, which matters for drilling, while the impact applies torque in rotational hammer pulses, which matters for driving fasteners. They are optimized for different jobs.
Do I need both or can I start with one?+
If your projects are mostly drilling holes in wood and metal under 1/2 inch, plus light fastener work, start with the drill. If your projects are mostly building decks, framing, hanging drywall, or assembling structures with lots of long screws, start with the impact driver and add a cheap drill later. Two-tool combo kits at 150 to 220 dollars usually beat buying a single premium tool.
Are 12V tools too weak for real DIY work?+
For most homeowner tasks, no. A modern 12V brushless drill puts out 350 to 450 inch-pounds of torque, which handles deck screws, drywall, and 3/4 inch wood bits without issue. The 18V or 20V max class wins on sustained heavy work, larger hole saws, and longer runtime. For occasional projects, 12V is lighter, cheaper, and entirely sufficient.
