Utility knife: how to hold it safely

Learn to hold and use a utility knife safely, so you cut cleanly without slicing your hand.

UK-01Know your knifeA utility knife (also called a Stanley knife or box cutter) has a sharp, replaceable blade that slides in and out of a plastic or metal handle using a slider button on top. The blade is usually segmented so you can snap off a blunt tip with pliers to expose a fresh edge. Always assume the blade is sharp enough to cut skin easily, even if it looks worn.

UK-02Extend only what you needSlide the button forward until 10 to 15mm of blade shows, no more. A short blade gives you control and means less blade to hurt you if it slips. Beginners often extend the whole blade because it looks more capable, but a long blade is harder to control and more dangerous.

UK-03Grip it like a pen, not a daggerHold the handle the way you'd hold a thick pen, with your index finger resting along the top near the blade for control. Your thumb and other fingers wrap underneath. Do not grip it in a fist with the blade pointing down like a stabbing weapon; you lose precision and increase the force behind any slip.

UK-04Cut away from your bodyPosition whatever you're cutting so the blade moves away from you, never towards your hands, wrists, or torso. Keep your free hand well clear of the cutting line, and never brace material against your leg or stomach. If you're using a straightedge or ruler, keep your guiding hand's fingers above the top edge, not level with where the blade runs.

UK-05Use light, repeated strokesDon't try to cut through thick card or lino in one heavy push. Score the same line two or three times with light pressure, letting the blade do the work. The common beginner mistake is pressing hard on the first pass, which makes the blade skid sideways off the line and into a finger.

UK-06Check you're doing it rightYou're holding it correctly if your grip feels relaxed, not white-knuckled, and you can see the blade at all times. The cut line should be clean and straight, not ragged, which shows you used light, controlled strokes rather than one hard shove. If your hand ever crosses in front of the blade's path, stop and reposition; that's a sign your technique needs adjusting, not that you're being overly careful.

UK-07Retract the blade before you put it downAlways slide the button back so the blade disappears into the handle the moment you stop cutting, even if you're only setting it down for a few seconds. Never leave an exposed blade on a table or in a pocket. When the blade becomes dull or chipped, snap off the segment with pliers or replace it entirely rather than pushing harder to compensate.

1 pack · Replacement utility knife blades

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