If you want maximum power and unlimited runtime, go corded. If you want mobility and convenience, go cordless.

Angle grinders are go-to tools for cutting, grinding, sanding, and surface prep—on metal, masonry, tile, and more. But choosing between a corded and cordless angle grinder can feel tricky.

The short version: corded grinders win for continuous heavy work, while cordless grinders win for convenience and mobility—especially if you already own batteries in a tool platform. Many pros keep both.

This guide breaks down the differences in plain English, with recommendations based on real-world tasks.

Quick Comparison (Corded vs Cordless)

Corded Angle Grinder Best For

• Long grinding sessions (weld cleanup, beveling, concrete work)

• Maximum consistent power

• Shop work where outlets are easy to access

• Budget-friendly setups (no batteries required)

Cordless Angle Grinder Best For

• Working away from outlets (job sites, outdoors, ladders, roofs)

• Fast grab-and-go cuts and repairs

• Tight spaces where cords get caught

• Users already invested in a battery ecosystem

Power and Performance: Which One Cuts Faster?

Corded grinders generally deliver steady power as long as they’re plugged in—great for demanding cuts and heavy grinding.
Cordless grinders have improved a lot with modern brushless motors and high-output batteries, but performance can still vary depending on battery size and charge level.

The key difference most users notice isn’t “can it cut?”—it’s how long it can keep cutting at full speed. Many comparisons highlight that cordless models can feel comparable in power for typical tasks, but runtime becomes the limiter.

Runtime and Productivity: The Biggest Difference

Corded = Unlimited Runtime

If you’re grinding for 30–60 minutes continuously, corded wins. No battery swaps. No waiting.

Cordless = Battery Swaps (Plan for It)

Cordless grinders shine for short bursts: trimming rebar, cutting bolts, quick masonry notches, or removing rust spots. For longer jobs, you’ll want:

• Two batteries minimum, ideally higher capacity

• A fast charger

• A habit of rotating packs

This is why many tradespeople run cordless for mobility—but keep corded for extended heavy work.

Portability, Safety, and Convenience

Cordless Advantages

• No cord to snag, cut, or drag across hot metal

• Easier to work on ladders/scaffolding or around vehicles

• Faster setup—grab it and go

Corded Advantages

• No battery weight (often lighter in hand compared to a tool + big pack)

• No power drop as the battery drains

• Less upfront complexity (no charger/battery ecosystem)

Safety note: Whether corded or cordless, always run with the guard installed and correctly positioned—standards require guards for portable abrasive tools in many work settings.

Cost: Upfront vs Long-Term Value

Corded Cost Profile

• Lower upfront cost

• No batteries to replace later

• Great “single-tool” value if you don’t already own a platform

Cordless Cost Profile

• Higher upfront cost (tool + batteries + charger)

• Best value if you already own compatible batteries

• Big productivity boost if you work in multiple locations

What About Disc Size? (4.5" vs 5" vs 7")

Disc size affects cutting depth, control, and the kinds of jobs you’ll tackle.

• 4.5-inch / 115 mm: Most common, easy to control, great for DIY and light fabrication

• 5-inch / 125 mm: A little more cutting capacity while staying manageable

• 7-inch (and larger): Deeper cuts and faster material removal, but heavier and harder to control

Also: every disc has a maximum RPM rating—never exceed it. 

Which Should You Choose? (By Use Case)

Choose a Corded Angle Grinder If You…

• Grind welds regularly or remove lots of material

• Do concrete or masonry grinding for extended periods

• Want the simplest, most budget-friendly setup

• Primarily work in a shop/garage with easy access to outlets

Choose a Cordless Angle Grinder If You…

• Work in the field, outdoors, or around a large property

• Move job-to-job and want fast setup

• Often work in awkward spaces where cords get in the way

• Already own batteries (18V/20V platform) and want tool-only value

The “Best of Both” Setup

If budget allows:

• Cordless (4.5" or 5") for quick cuts, mobile work, and convenience

• Corded (same size or larger) for long grinding sessions and heavy removal

That combo covers almost everything

Key Safety Tips (Don’t Skip This)

• Angle grinders are extremely useful—and can be dangerous if used carelessly. At a minimum:

• Keep the guard installed and positioned to deflect debris

• Match the disc type to the job (cutting disc ≠ grinding disc)

• Check the disc’s max RPM rating and never exceed it 

• Use two hands and brace your stance

• Wear PPE: eye/face protection, hearing protection, gloves, and a dust mask/respirator when needed 

• Secure the workpiece—don’t “freehand” cuts on loose material

FAQ

Are cordless angle grinders as powerful as corded?

Many modern cordless grinders can feel comparable for typical cutting and grinding, but corded models still offer more consistent power over long sessions. 

How many batteries do I need for a cordless grinder?

For real work (not just occasional cuts), plan on two batteries minimum, plus a charger—so one can charge while you work. 

What’s the best grinder size for most homeowners?

A 4.5-inch (115 mm) or 5-inch (125 mm) grinder fits most DIY cutting and grinding tasks and is easier to control than larger models. 

Conclusion: Corded or Cordless?

If you want maximum power and unlimited runtime, go corded.
If you want mobility and convenience, go cordless—especially if you already own batteries.

For many users, the smartest solution is owning one of each: cordless for quick/mobile tasks, corded for heavy grinding marathons.