What Size Hole Saw for 3/4 Hole? | The Direct Answer

Picking the right hole saw comes down to one distinction that trips up nearly everyone: are you cutting a hole that measures 3/4 of an inch across, or are you working with 3/4-inch conduit? These are not the same thing, and mixing them up means a trip back to the store. Here’s how to know which one you need before you buy.

The Rule: Match the Saw to the Finished Hole Diameter

When the hole itself needs to be 3/4 in. (19 mm) wide, the correct cutter is a 3/4-inch hole saw. The saw’s diameter is the hole’s diameter, so there’s no guesswork in typical wood, drywall, or light metal applications.

Both major manufacturers list their 3/4-inch models this way. The saw you grab should match the measurement you need, full stop.

The Conduit Exception: Why 3/4-Inch Pipe Needs a Bigger Saw

If you’re running electrical conduit, forget the 3/4-inch saw entirely. Trade sizes describe the pipe’s nominal inside diameter, not the hole it needs.

That extra room lets the conduit fit with its fittings and bends without binding. Drilling the exact pipe size would leave you forcing the conduit through a hole that’s too tight.

Three Specs to Check Before You Buy

Once the diameter is right, three details separate a smooth cut from a wasted purchase.

• Cutting depth. Measure your workpiece. If your material is thicker than the saw’s depth rating, the cutter bottoms out.
• Arbor thread. The saw must thread onto your drill’s arbor. A mismatch means the saw won’t mount at all.
• Tooth style and material. Check the manufacturer’s speed chart for the exact model, since recommended RPMs vary by saw construction and material.

For a tested roundup of larger cutters, see our picks for the best 6 3/8 hole saw options if your next job steps up in size.

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