Impact Driver vs. Drill: Do You Need Both?
The short answer: a drill is for making holes and driving small screws with precision; an impact driver is for driving long screws and lag bolts without stripping heads or straining your wrist. If you only do occasional home repair, a drill alone covers you. If you build decks, install cabinets, or drive screws over 2 inches regularly, you want both.
I built my first deck with just a drill. It took forever, my wrist ached for a week, and I stripped more screw heads than I care to admit. The next summer I borrowed a friend’s impact driver for a fence project. I drove 400 screws in an afternoon without stripping a single one.
The impact driver doesn’t just make driving long screws faster. It makes it fundamentally different — and for certain jobs, it makes the drill the wrong tool entirely.
Here’s when you want each one, and what to buy if you’re adding an impact driver for the first time.
What an Impact Driver Actually Does Differently
A standard drill applies continuous rotational force. When resistance increases — say, a screw meets a knot, or you’re driving a 3” structural screw into dense lumber — the motor strains and torque climbs. You feel it in your wrist. The screw can strip.
An impact driver applies rotational force in rapid bursts — several hundred impacts per minute — combined with continuous rotation. When the mechanism hits resistance, instead of stalling, it hammers. You get dramatically more torque than the motor’s continuous output would suggest, with almost no rotational feedback to your wrist.
The practical result: long screws go in faster, with less effort, and almost never strip. The bit stays engaged. Your wrist stays happy.
The tradeoff: the impact mechanism is loud. It’s also not appropriate for small screws where precision matters — the hammering can overdrive a finish screw in a heartbeat.
The Decision Tree — 3 Questions
Do you drive a lot of screws longer than 2 inches? Deck screws, structural screws, lag bolts, fence screws — anything where you’re driving into real resistance. If yes, you want an impact driver.
Do you need precise hole placement or are you using hole saws? Impact drivers run hot with hole saws and create less precise entry points than a drill. If precision drilling or hole saws are a priority, you need the drill regardless.
Are you doing occasional home repair or regular project work? If you’re hanging a few pictures and assembling furniture twice a year, a drill handles almost everything. If you’re building decks, installing cabinets, or doing regular carpentry, both tools earn their keep.
When to Use the Drill
- Drilling holes of any size (the impact mechanism is wrong for this)
- Driving small screws where you might overdrive with an impact (#6 or smaller)
- Using hole saws, Forstner bits, or spade bits
- Any operation where you need the clutch to prevent stripping (the drill’s clutch settings matter here; impact drivers don’t have a standard clutch)
- Overhead applications where impact noise is a concern
The drill is the precision instrument. Hole diameter, depth, and screw setting are all more controllable.
When to Use the Impact Driver
- Deck screws (2”–3.5”)
- Structural screws and lag bolts
- Cabinet installation and general fastening where you’re driving many screws
- Driving into end grain (where resistance is high)
- Any application where stripped heads are a regular problem with a standard drill
The impact driver is the workhorse. Speed and torque without wrist strain.
Best Impact Drivers 2026
Best Overall — DeWalt DCF885 20V Max
The DCF885 is the impact driver I’d put in most people’s hands. It’s brushless, lightweight at 2.8 pounds with battery, and the three-speed settings give it more versatility than a single-speed impact driver. The high speed is for driving screws fast; the low speed gives you more control for smaller fasteners.
It fits in the DeWalt 20V ecosystem, which matters if you already own a DeWalt drill. Same batteries, no doubling up on chargers.
What it doesn’t do well: Very small screws in delicate material — the lowest speed setting is still more than you want for finish work into soft material.
Best Premium — Milwaukee 2853-20 M18 Fuel
The Milwaukee M18 Fuel impact driver is what professional carpenters and contractors use daily. The REDLINK intelligence monitors motor and battery condition in real time, preventing overloads that shorten tool life.
1,800 in-lbs of torque — meaningfully more than the DeWalt — and a four-mode setting system that includes a precision mode for small fasteners. It’s heavier and more expensive, but for daily professional use, those tradeoffs are worth it.
Best Value — Combo Kit (Drill + Impact Driver Together)
If you’re starting from zero and know you want both tools, buying a combo kit is almost always better value than buying separately. DeWalt’s DCK240C2 gives you the 20V drill and impact driver as a matched pair with two batteries and a charger.
The tools in combo kits are slightly lower spec than the standalone premium models — brushed motors in the cheaper combos, shorter battery life — but for a beginner who’s figured out they need both tools, the combo kit is the practical choice.
Common Mistakes
Using an impact driver to drill holes. The impact mechanism destroys standard twist bits faster and creates rougher hole entry. Use a drill for drilling.
Over-driving screws into softwood. Impact drivers are powerful. Pine and cedar are soft. A moment of inattention buries a screw head completely. Keep your hand on the tool and learn the feel of the final resistance.
Buying both tools in different brands. If you buy a DeWalt drill and a Milwaukee impact driver, you’ve got two battery systems. You’ll spend the rest of your tool-buying life maintaining two chargers and two battery inventories. Pick one platform and stay there.
Assuming an impact driver replaces a drill. It doesn’t. For drilling holes and precision screw driving, you still need the drill. An impact driver is an addition, not a replacement.
Frequently Asked Questions
Q: Can an impact driver drive all the same screws a drill can? A: For screws longer than 2”, often better. For small finish screws and precise applications, no — the impact mechanism is too aggressive. Use the right tool for the task.
Q: Do I need an impact driver if I mostly hang drywall and install trim? A: For drywall, a dedicated drywall screwgun is better than either. For trim work (small finish nails and screws), a drill with clutch is more appropriate. An impact driver is most valuable for framing, decking, and structural work.
Q: Are brushless impact drivers worth the premium over brushed? A: Yes. Brushless motors run cooler, last longer, and extract more power from the battery. The price difference has narrowed significantly — for most buyers, the brushless premium is now worth paying.
Q: What’s the difference between in-lbs and ft-lbs of torque? A: Impact drivers are usually rated in in-lbs (inch-pounds). To convert: divide by 12 to get ft-lbs. 1,500 in-lbs = 125 ft-lbs. For driving screws, in-lbs is the more useful unit since screw driving rarely requires massive torque — it requires sustained, rapid application of moderate torque.
Q: Should I buy a 1/4 inch impact driver or a 3/8 inch? A: For driving screws, 1/4 inch is the standard and correct choice. The 1/4 inch hex chuck accepts all standard impact driver bits. A 3/8 inch impact wrench is a different tool for nuts and bolts, not screws.
