What blade do I need to cut concrete with an angle grinder?

Use a diamond segmented blade in the correct size for your grinder (4.5-inch or 7-inch). Never use a metal cut-off wheel or wood blade on concrete.

How deep can I cut with an angle grinder?

A 4.5-inch grinder cuts about 1.5 inches deep. A 7-inch grinder cuts about 2.5 inches. For deeper cuts, make multiple passes or use a concrete saw.

Do I need water when cutting concrete with a grinder?

Angle grinders should NOT be used with water for safety reasons. Always cut dry and use a vacuum shroud or work outdoors with a respirator to manage silica dust.

How to Cut Concrete with an Angle Grinder

The ability to cut concrete with an angle grinder makes it the most accessible tool for the job — most contractors already own one. This guide covers how to cut concrete with an angle grinder step by step: When you cut concrete angle grinder technique matters as much as blade selection. blade selection, depth limitations, dust control, and technique for making clean cuts.

What You Need

Angle grinder: 4.5” (standard) or 7” (large) with a safety guard
Diamond blade: Segmented rim, rated for concrete/masonry, correct diameter for your grinder (4.5” or 7”), 7/8” arbor
Safety gear: ANSI Z87.1 safety glasses, N95+ respirator, hearing protection, gloves, steel-toed boots
Dust control: Vacuum shroud + HEPA dust extractor (for indoor work) or work outdoors with wind at your back

For blade recommendations, see Best Diamond Blades for Concrete. For understanding blade types, see Segmented vs Continuous vs Turbo.

Step 1: Mark Your Cut Line

Use a chalk line or straightedge to mark the cut on the concrete surface. For short cuts, a pencil line or marker works. For long straight cuts, snap a chalk line.

Step 2: Set Up Dust Control

This is not optional. Concrete dust contains crystalline silica — a known carcinogen. For indoor work, attach a vacuum shroud to your grinder and connect it to a HEPA-filtered dust extractor. For outdoor work, position yourself upwind and wear a respirator. See Silica Dust Safety Guide.

Step 3: Score the Line

Make a shallow first pass — about 1/4” deep — along the marked line. This creates a guide channel that prevents the blade from wandering on subsequent passes. Keep the grinder moving at a steady pace. Don’t force the blade.

Step 4: Deepen the Cut

Make additional passes, each one slightly deeper than the last. On a 4.5” grinder, you’ll max out at approximately 1.5” deep. On a 7” grinder, approximately 2.5” deep. Take 2-3 passes to reach full depth rather than trying to cut deep in one pass — this reduces heat buildup and extends blade life.

Step 5: For Deeper Cuts

If you need to cut deeper than your grinder allows, you have two options. Score and break: Cut as deep as possible, then break the concrete along the scored line with a cold chisel and hammer. Cut from both sides: If accessible, score the concrete from both sides and break the middle.

For cuts deeper than 3”, an angle grinder isn’t the right tool — use a handheld cut-off saw or walk-behind saw. See our Concrete Saw Buying Guide.

Common Mistakes When You Cut Concrete with an Angle Grinder

No dust control — the most dangerous mistake. One cut through concrete without a respirator exposes you to harmful silica levels.

Wrong blade — never use a metal cut-off wheel, wood blade, or grinding disc to cut concrete. Use a diamond segmented blade rated for masonry.

Removing the guard — the guard protects you from blade fragments and sparks. Keep it on, always.

Forcing the blade — let the diamond do the work. Excessive pressure overheats the blade, causes glazing, and can break segments.

Cutting too deep in one pass — take 2-3 progressive passes for clean cuts and longer blade life.

Can I Use Water to Cut Concrete with an Angle Grinder?

No. Angle grinders are not designed for wet cutting — water and electric motors create an electrocution hazard. Always cut dry with an angle grinder and manage dust with a vacuum shroud or respirator. For wet cutting applications, use a dedicated concrete saw or wet tile saw.

For alternative methods of cutting concrete Mastering how to cut concrete angle grinder style opens up the most common cutting tasks to any contractor., see How to Cut Concrete Without a Saw. For cut-off wheel options, see Best Cut-Off Wheels for Concrete.

Recommended Diamond Blades for Angle Grinder Concrete Cutting

Blade	Best For	Link
VA 9-inch Ultra Value	For 9-inch angle grinders and cordless cut-off saws	Check price on Amazon
VA 14-inch Ultra Value	Best all-around for cured concrete, block, and general masonry	Check price on Amazon

Browse the full Virginia Abrasives lineup on Amazon →