How to Cut Quartz Countertop with Rotozip


Quartz countertops are a popular choice for modern kitchens and bathrooms due to their durability, aesthetics, and low maintenance. However, sometimes it becomes necessary to cut or trim quartz countertops to customize the size or shape. Cutting quartz can seem intimidating, but with the right tools like a Rotozip and proper precautions, it can be done successfully as a DIY project.

A Rotozip is a rotary tool that is specially designed for cutting curves and straight edges in countertops. Using the right Rotozip bit and proper techniques allows you to accurately cut quartz slabs while minimizing chipping. With some planning and preparation, you can cut your quartz countertop with ease.

Tools and Materials Needed

  • Rotozip rotary tool with diamond grit cutting bit
  • Eye protection
  • Ear protection
  • Respirator mask
  • Gloves
  • Straight edge or square
  • Duct tape
  • Marking pencil
  • Wet/dry vacuum

Make sure to use a Rotozip bit specifically designed for cutting stone and quartz. The diamond grit blades are abrasive enough to cut through the hard material. Also have eye and ear protection as cutting will produce a lot of dust.

Steps to Cut Quartz Countertop with Rotozip

1. Make a Cutting Plan

Measure the countertop and mark your cut lines with a pencil. Make sure to account for the width of the blade when marking your lines. Plan your cuts to avoid Onyx or veining portions for a cleaner finish.

2. Prepare the Cutting Area

Clear the area of any items. Cover nearby surfaces with plastic sheeting and tape down. Vacuum the countertop to remove any dirt or debris.

3. Attach a Straight Edge

Clamp a straightedge to the countertop aligned with your cut mark. This guides the Rotozip for straight cuts. For curved cuts, create a template.

4. Cut Slowly Through the Quartz

Position the Rotozip at the starting point. Slowly guide it along the straightedge applying firm, even pressure. Let the tool do the work.

5. Make Several Shallow Passes

Make several passes cutting only 1/8″ deep each time. Lifting the bit periodically allows dust to clear. Avoid rushing through deep passes.

6. Finish the Cut

Repeat shallow passes along the cut line until completely through the slab. For corners, use the Rotozip to notch or core out material.

7. Smooth and Clean Up

Carefully smooth any rough edges with a hand pad. Thoroughly vacuum and wipe away all dust from the cutting area and countertop.

Safety Tips

  • Wear eye protection and mask to prevent breathing dust
  • Keep fingers away from the blade
  • Avoid forcing the tool, go slow with light pressure
  • Ensure work area is clear of clutter and slip hazards
  • Have fire extinguisher ready in case of sparks


What rpm speed should I use the Rotozip for quartz?

Use lower rpm speeds between 10,000-20,000 rpm when cutting quartz. Higher speeds can cause excessive chipping. Adjust speed as needed for smooth cutting.

What type of Rotozip blade is best?

Use a diamond grit Rotozip blade specifically for cutting stone materials like quartz, granite, and marble. The diamond abrasives provide durability and clean cutting action.

How can I cut rounded corners or holes?

Rotozip tools allow you to cut rounded inside curves and holes. Use a diamond grit cylinder core bit to pre-drill corner radiuses. Alternate core drilling and freehand rounding with cylinder bits.

How do I account for the blade thickness when marking?

Factor in the Rotozip blade’s thickness, usually 1/8”, from your drawn cutline to get an accurate cut. Cut inside your marks to allow for the width of the blade’s cut.

How do I minimize chipping?

Cut slowly with steady, even pressure. Making several shallow passes reduces chipping on the top edges. Use painter’s tape along cut lines. Chipping is typical and can be smoothed with sanding pads.


Cutting a quartz countertop with a Rotozip rotary tool is an effective DIY method for customizing the size or shape of your countertop. While maybe intimidating at first, taking proper safety measures and using the right specialized diamond cutting blades allows you to accurately cut quartz with minimal risk of cracking. Patience and making multiple shallow passes is key to slowly cutting through the slab while minimizing chipping and damage to the surface. With the right Rotozip technique, you can cut quartz countertops to achieve a custom fit.