How to Cut a Granite Countertop

Cutting granite countertops is one of the more demanding tasks a homeowner can take on without a professional fabricator. The material is unforgiving, the tools are specialized, and one wrong move can crack a slab that cost several hundred dollars per linear foot. This guide walks you through every stage of the process: selecting the right blade, setting up a safe cutting environment, making straight cuts, and tackling sink or cooktop openings without destroying your stone.

Can you cut granite countertop yourself? Yes, with the right tools and preparation. A wet saw or angle grinder fitted with a continuous-rim diamond blade can cut granite cleanly when you feed the blade slowly, keep water flowing continuously, and secure the slab firmly. DIY cutting is realistic for straight trim cuts and simple sink openings on standard 3/4-inch or 1.25-inch slabs. Complex curved profiles, polished finished edges, and multi-piece seamed installations consistently produce better outcomes with professional fabrication equipment.

If any stage of this project gives you pause, countertop installation and repair from Ace Handyman Services is available at any point. Bring in a craftsman for the cut alone, for the full install, or for cleanup after a DIY attempt that did not go as planned.

Can You Cut Granite Yourself?

Granite sits between 6 and 7 on the Mohs hardness scale, harder than most tile and far harder than wood or drywall. That hardness means standard woodworking blades will not touch it, and forcing the wrong tool into the material creates heat, blade damage, and potentially a cracked slab. What makes DIY cutting possible is the diamond blade, which grinds rather than cuts, working through granite one abrasive pass at a time.

The realistic scope for a prepared DIYer includes: trimming a slab to final length, cutting a rectangular or L-shaped piece to fit an odd corner, and making a sink or cooktop opening in a countertop that is not yet installed. Where the math tips toward a pro: any job requiring a polished factory-quality finished edge, any install with multiple seams that need alignment, and any slab larger than two people can safely manage on a pair of sawhorses.

Tools and Materials You Need

Gathering the right equipment before you start is not optional. Improvising mid-cut on granite leads to chipped edges, overheated blades, and a silica dust hazard you are no longer controlling.

Choosing the Right Diamond Blade: Segmented vs. Continuous Rim

What blade do you use to cut granite? Use a continuous-rim (turbo-rim) diamond blade rated for stone and wet cutting. Continuous-rim blades produce a smoother cut with less chipping on the polished face. Segmented blades cut faster and run cooler in dry applications, but the interrupted edge leaves a rougher kerf and increases chip risk on polished granite. For countertop work, a 4-inch to 7-inch continuous-rim diamond blade rated for 5,000-8,500 RPM is the standard choice. Always confirm the blade RPM rating meets or exceeds your tool's no-load RPM before mounting it.

Wet Saw, Angle Grinder, or Circular Saw

A wet saw (tile saw with a water-fed table) is the most controlled option for long straight cuts. The integrated water system keeps the blade cool and suppresses silica dust throughout the cut. For sink cutouts and smaller trim cuts, a 4.5-inch or 5-inch angle grinder with a continuous-rim diamond blade is the more maneuverable choice. A circular saw fitted with a diamond blade can make straight cuts when you build a guide fence, but the water delivery is manual rather than integrated, so dust suppression requires more active management.

Other Materials and PPE You Will Need

• N95 respirator or half-face respirator with P100 filters (N95 minimum; full P100 strongly preferred)
• Safety goggles (not just glasses; full seal against stone particles)
• Hearing protection (cut-off saws and grinders exceed 95 dB)
• Cut-resistant gloves
• Painter's tape (2-3 inch wide)
• Straightedge or aluminum guide rail and C-clamps
• Sawhorses rated for slab weight (granite runs 18-20 lbs per square foot at 3/4-inch thickness)
• Garden hose or wet saw water supply
• Permanent marker or chalk line
• Diamond-tipped drill bit (for sink cutout pilot holes)
• Polishing pads (50-grit through 3000-grit sequence) for edge finishing
• Shop vacuum with HEPA filter

Diamond blades, polishing pad sets, clamps, and appropriate respirators are all stocked at Ace Hardware stores. When a project requires specialized stone fabrication, Ace Handyman Services craftsmen arrive with the equipment already sourced.

Safety First: Silica Dust, Wet Cutting, and Kickback

Why Silica Dust Is Dangerous and How to Control It

Is cutting granite dangerous to breathe? Yes. Granite contains crystalline silica, and cutting it dry releases respirable silica particles that reach deep into lung tissue. Repeated exposure causes silicosis, an irreversible and progressive lung disease. A single dry cut without respiratory protection can deliver a significant silica dose. Wet cutting suppresses the vast majority of airborne particles by binding them in slurry before they become airborne. Always wet-cut granite. If a situation forces a dry cut (blade type, outdoor conditions), use a P100 respirator, work upwind, and keep bystanders well clear.

Required PPE

Wear your respirator before the blade starts, not after you smell dust. Goggles with a full foam seal protect against stone chips that safety glasses will not stop. Hearing protection matters on angle grinder work exceeding 90 minutes; cumulative exposure adds up faster than most people expect. Cut-resistant gloves protect against sharp slab edges during handling, not against the blade itself. Keep hands a minimum of 6 inches from the cutting path at all times.

Preventing Kickback and Blade Overheating

Kickback happens when the blade binds in the kerf. On a granite slab, binding forces can be violent. Support the slab on both sides of the cut with sawhorses spaced so the cut piece is supported as it separates rather than allowed to fall and pinch the blade. Feed the blade at a steady, unhurried pace. If the motor bogs down, ease back. Forcing the tool through the stone overheats the blade, degrades the diamond matrix, and increases the risk of the blade warping or fracturing. A continuous water supply to the blade prevents heat buildup. Check the water flow before each pass.

How to Cut a Granite Countertop Step by Step

Step 1: Measure, Mark, and Tape the Cut Line

Precision on the layout prevents all downstream problems. Measure twice from a reference edge and mark the cut line with a permanent marker on the polished face. Apply two to three inches of painter's tape along the full length of the line on both sides, then redraw the cut line on top of the tape. The tape does two things: it gives the blade a less abrupt entry into the surface, and it holds micro-fragments of stone at the cut edge rather than letting them scatter as chips. Do not skip the tape on the polished face side.

Step 2: Secure the Slab

A slab that moves during the cut will chip or crack. Position the granite on two sawhorses so the cut line overhangs both supports by at least 2 inches on each side. For angle grinder cuts, clamp a straight aluminum guide rail or a piece of rigid MDF parallel to the cut line to run the tool's shoe against. Clamp the slab to the sawhorses with at least four C-clamps. If using a wet saw table, the table fence handles alignment, but check that the slab cannot shift laterally before starting. Place a support board or foam under the cutout section of a sink opening so the piece does not fall and snap the slab as it separates.

Step 3: Make the Cut with Steady Pressure and Continuous Water

Let the blade grind; do not push it. Start the tool, confirm water flow is reaching the blade, and lower the blade into the stone at the marked line. Move forward at a pace that lets the tool run at full speed without bogging. If the motor slows, ease back slightly until RPM recovers, then resume. For a wet saw, the fence guides your feed rate. For an angle grinder with a guide rail, keep the tool's shoe pressed against the rail and move in a single smooth pass. Lifting or rocking the blade mid-cut widens the kerf and increases chip risk. At the end of the cut, support the piece as it separates.

Step 4: Cut a Sink or Cooktop Opening

Sink cutouts are the most technically demanding part of countertop work. Trace the sink or cooktop template onto the granite with a marker, then apply painter's tape over the entire template outline. Drill a pilot hole at each corner of the opening using a diamond-tipped hole saw or a diamond drill bit at 3/8 inch or larger. These pilot holes are relief cuts; they allow the blade to turn the corner without running the stress of the turn through the slab. Connect the pilot holes with straight cuts using an angle grinder and guide rail, cutting from hole to hole. Keep the piece inside the cutout supported throughout; sudden drops create radial cracks from the corners. After all four sides are cut, lower the piece out slowly with both hands or with a helper managing the weight.

How to Avoid Chipping the Granite

Chips on the polished face are the most common and most frustrating outcome of a DIY granite cut. Four habits eliminate most of them. First, always cut with the polished face up when using a wet saw (the blade cuts upward through the material, so the cleaner exit is on the top face). When cutting with an angle grinder, the blade exits on the side facing the work surface, so place polished face down against a foam pad and cut from the unfinished back. Second, never skip the painter's tape; it bridges small surface imperfections and keeps edge fragments from flying free.

Finishing and Polishing the Cut Edge

A freshly cut granite edge is rough and sharp. Polishing it to match the factory finish requires a progression of diamond polishing pads used wet, starting at 50-grit or 100-grit and working up through 200, 400, 800, 1500, and 3000-grit. Each grit removes the scratch pattern left by the previous one. Work each grit until the surface is uniform before moving to the next. Keep the pad wet throughout. The result is a smooth, honed edge. A full factory-gloss polish requires a buffing pad with polishing compound at the end of the sequence.

Edge profiles (bullnose, ogee, bevel) require a hand router with a diamond-tipped router bit or a variable-speed grinder with profiling pads. If you need a finished decorative edge to match the existing profile on adjacent slabs, that work is typically where most DIYers hand off to a professional stone fabricator or a skilled craftsman with the right tooling.

Things to Consider Before You Start

• Do you have wet cutting capability? A dry cut without proper dust suppression is a genuine health risk. If you do not have access to a wet saw or cannot supply continuous water to an angle grinder blade, this project needs to wait until you do.
• Is the slab already installed? Cutting installed granite requires working in an enclosed space, which concentrates silica dust even with wet cutting. Ventilation and PPE requirements are higher, and there is no room to use a wet saw table.
• How large is the slab piece you are cutting off? Pieces larger than roughly 12 inches wide and 24 inches long need a helper to support as they separate. An unsupported piece falling away from the slab transmits shock back through the stone and can crack the slab at the kerf.
• Do you need a polished finished edge visible in the final installation? Polishing a cut edge to factory quality takes time, the right pads, and practice. A raw edge hidden by an undermount sink is fine unpolished; an exposed edge on a peninsula is not.
• Is this a slab with pre-existing cracks or repairs? Cutting anywhere near an existing crack is high risk. The vibration and blade pressure can propagate the crack unpredictably.

If your answers point toward a job that exceeds straightforward DIY, that is useful information before you start, not after a problem develops.

Why Homeowners Bring in Ace Handyman Services

Granite countertop work rewards preparation and penalizes improvisation, and a fresh slab often makes a coordinating kitchen backsplash installation the natural next step. Here is why homeowners at every skill level bring in Ace Handyman Services:

• Peace of mind on an irreplaceable surface. Granite slabs are expensive and not repairable after a crack. One miscalculation on a cut eliminates the margin for error and the material simultaneously.
• One-year labor warranty. Work completed by Ace Handyman Services is backed by a one-year labor warranty. DIY work is not.
• No equipment to source, learn, or return. A wet saw rental, a diamond blade, polishing pad sets, and the right clamps add up in both cost and logistics. Our craftsmen arrive with the tools already in the truck.
• Background-checked, multi-skilled W-2 craftsmen. Ace Handyman Services technicians are employees, not gig contractors. They carry consistent experience across carpentry, installation, and finish work.
• Predictable weekday timeline, no weekends lost. A countertop cut and install scheduled during the week is done and cleaned up before the weekend starts.
• Right-sized scope. If your project actually needs only a trim cut rather than a full reinstall, our craftsmen will tell you that. Honest assessment of what the job requires is part of the service.
• Cleanup included. Granite slurry, stone chips, and dust are part of every cut. Cleanup is included so the kitchen is usable when the work is done.

When you are ready to move forward with professional help, reach out to your local Ace Handyman Services office to schedule an appointment.

Frequently Asked Questions

Can you cut granite with an angle grinder?

Yes. An angle grinder fitted with a 4.5-inch or 5-inch continuous-rim diamond blade rated for stone cuts granite effectively, particularly for sink cutouts and shorter straight cuts. You need to supply water manually to the blade during the cut for dust suppression and blade cooling. A guide rail clamped parallel to the cut line maintains accuracy that a freehand pass cannot.

Do you have to cut granite wet?

Wet cutting is required for safety and strongly recommended for cut quality. Granite contains crystalline silica; dry cutting produces respirable dust that causes silicosis. Continuous water flow suppresses that dust and keeps the diamond blade below the temperature threshold where the bond matrix degrades. Dry cutting with a P100 respirator outdoors is a last resort, not a standard practice.

How do you cut granite without chipping it?

Apply painter's tape on both sides of the cut line on the polished face, use a continuous-rim diamond blade rather than a segmented blade, score a shallow initial pass before the full-depth cut, and reduce feed rate at the beginning and end of each pass. Cutting with the polished face up on a wet saw (or polished face down with an angle grinder) also affects which face sees the cleaner blade exit.

How do you cut a sink hole in granite?

Trace the sink template onto the stone, apply painter's tape over the outline, then drill a diamond-tipped pilot hole at each corner of the opening. Connect the corners with straight cuts using an angle grinder and guide rail, cutting from pilot hole to pilot hole. Keep the interior piece supported throughout all four cuts so it does not drop and crack the slab as the last cut completes.

How do you finish a cut granite edge?

Polish the cut edge with diamond polishing pads used wet in a grit sequence from 50 or 100 up through 200, 400, 800, 1500, and 3000. Each stage removes the scratch pattern of the previous grit. A final buff with polishing compound on a foam pad produces a honed or near-gloss finish. Decorative profiles require a diamond router bit or profiling pad set on a variable-speed grinder.

How long does it take to cut a granite countertop?

A single straight trim cut on a standard slab takes 15-30 minutes including setup, securing the slab, and making the cut. A full sink cutout with corner drilling and four connecting cuts takes 45-90 minutes. Factor in additional time for polishing the cut edge: a complete grit sequence from 50 to 3000 on a 24-inch edge runs 60-90 minutes done carefully. Total project time for a standard trim-and-sink countertop cut runs 3-5 hours for a prepared first-timer.