Drill Speed Chart: The Right RPM for Wood, Metal, and Plastic
Most people pick a drill speed the same way they pick a radio station: whatever it was set to last time. Then they wonder why the bit smokes in steel, why the hole in pine comes out ragged, or why a hole saw in acrylic cracks halfway through. Drill speed is not a minor detail. It decides whether the bit cuts cleanly or just rubs, overheats, and dulls itself.
This guide gives you practical speed ranges you can actually use, explains why they work, and shows how to adjust when your drill doesn’t have the exact setting you need.
Why Drill Speed Matters
A drill bit cuts by shearing material off the bottom of the hole. For that to work, the cutting edge has to move through the material at the right pace. Too slow and the bit scrapes instead of cutting, which takes forever and leaves a rough hole. Too fast and friction builds up faster than the chips can carry heat away. The bit overheats, the edge dulls, and in metal the work can even harden, making the rest of the hole harder to finish.
The right speed depends on two things: the material you’re drilling and the diameter of the bit. Bigger bits need slower speeds, because the outside edge of a wide bit travels much farther per revolution than the edge of a narrow one. That’s the whole reason a speed chart exists — it’s not fussiness, it’s geometry.
The Drill Speed Chart
These are starting points for a standard twist bit in a handheld drill or drill press. If your drill has a two-speed gearbox, use the low range for the larger bits and the high range for the smaller ones. For a drill press, set the belt or dial to the closest speed.
Wood (softwood, hardwood, plywood)
1/8 inch (3 mm): 2,000-3,000 RPM. 1/4 inch (6 mm): 1,500-2,500 RPM. 3/8 inch (10 mm): 1,000-2,000 RPM. 1/2 inch (13 mm): 800-1,500 RPM. 3/4 inch (19 mm): 500-1,000 RPM. 1 inch (25 mm) and up: 300-700 RPM.
Wood is forgiving. If you’re a little fast, you’ll mostly get away with it, especially in softwood. The real cost of too much speed in wood is tear-out around the hole and scorch marks in hardwood. Too slow, and the bit can grab and jerk the workpiece, which is a bigger problem with large spade bits and augers than with twist bits.
Metal (mild steel, aluminum, stainless steel)
1/8 inch bit: mild steel 1,500-2,500 RPM, aluminum 2,500-3,000 RPM, stainless steel 1,000-1,500 RPM. 1/4 inch bit: mild steel 800-1,200 RPM, aluminum 1,500-2,500 RPM, stainless steel 500-800 RPM. 3/8 inch bit: mild steel 500-800 RPM, aluminum 1,000-1,500 RPM, stainless steel 300-500 RPM. 1/2 inch bit: mild steel 300-500 RPM, aluminum 800-1,200 RPM, stainless steel 200-400 RPM.
Metal is where speed discipline pays off most. Aluminum cuts easily and tolerates higher speeds, but it can still melt onto the bit if you run dry and fast. Stainless steel is the opposite: it work-hardens. Run it too fast, let the bit rub without cutting, and the surface becomes harder than the bit. Once that happens, no amount of pressure will save the hole. Slow down, keep steady pressure, and use cutting fluid.
Plastic and acrylic
1/8 inch (3 mm): 1,500-2,500 RPM. 1/4 inch (6 mm): 1,000-1,800 RPM. 3/8 inch (10 mm): 700-1,200 RPM. 1/2 inch (13 mm) and up: 400-800 RPM.
Plastic’s enemy is heat. Too fast and the material melts, grabs the bit, and cracks as it cools. Acrylic is the worst offender — a fast, dull bit will crack a sheet from the hole outward. Keep speeds moderate, back the bit out often to clear chips, and use a sharp bit. A brad-point or a bit ground specifically for plastic helps, but speed control matters more than the bit.
The Rule of Thumb Behind the Chart
If you forget every number above, remember this: the bigger the bit, the slower you go. A 1/8 inch bit at 2,500 RPM and a 1/2 inch bit at 500 RPM have roughly the same cutting speed at the edge, because the wide bit’s edge covers far more distance per turn. That’s why every chart tapers down as diameter goes up, and why drilling a 1 inch hole at full trigger speed is a quick way to ruin a bit.
A second rule: harder material, slower speed. That single pair of rules gets you close enough for almost any job in the home workshop.
How to Set Speed on Your Drill
Two-speed cordless drills: Most cordless drills have a gear selector on top: 1 for low, 2 for high. Low gear gives you more torque and lower RPM — use it for anything over 3/8 inch in wood and for nearly all metal drilling. High gear is for small bits and driving screws. The variable-speed trigger then fine-tunes within the gear.
Single-speed drills: Many older corded drills run at one speed, usually around 2,500-3,000 RPM. For small holes in wood and aluminum, that’s fine. For large bits and steel, you control speed with the trigger — squeeze partway and hold it there. It takes practice, but a steady half-squeeze beats full speed every time in metal.
Drill presses: A drill press is the easiest tool to set correctly, because you pick the speed directly. Belt-drive presses change speed by moving the belt between pulleys; newer models have a dial. Check the chart inside the belt cover — most presses print one there — and set the closest speed. If your press can’t go as slow as the chart suggests for a large bit in steel, take lighter passes and let the bit cool between them.
Signs You’re Running the Wrong Speed
You don’t need a tachometer to know something is off. Watch for these:
Smoke or a burning smell in wood — you’re too fast, or the bit is dull. Slow down first; if the smell persists, sharpen or replace the bit.
Blue or straw-colored chips in metal — the bit is overheating. Slow down and add cutting fluid.
Tiny dust instead of chips in metal — the bit is rubbing, not cutting. Slow down, increase pressure slightly, and check the bit’s edge.
The bit squeals in steel — almost always too fast with too little pressure. Drop the speed until the squeal stops.
Melted plastic welding itself back into the hole — too fast. Slow down and clear chips frequently.
The drill stalls or the bit grabs violently — too slow for the feed pressure you’re using, or the bit is dull. Ease off the pressure and let the bit cut at its own pace.
Cutting Fluid: The Free Speed Boost
In metal, a drop of cutting fluid does more than any speed adjustment. It cools the bit, carries chips out, and keeps the edge sharp longer. Dedicated cutting oil is best, but for occasional home use, even a light machine oil or WD-40 on aluminum works. Don’t use cutting fluid on wood — it stains and serves no purpose there. And never use it on plastic, where it can cause cracking in some types.
Apply it before you start and add more as you go, especially on deep holes. If you’re drilling stainless steel, fluid isn’t optional — it’s the difference between a clean hole and a hardened, ruined one.
Practical Speed Tips for Common Jobs
Hanging a shelf in a stud wall: Small pilot holes, 1/8 to 3/16 inch, in wood: high gear, fast trigger. No need to overthink it.
Drilling a 1/2 inch hole through a steel bracket: Low gear, around 400 RPM, cutting oil, steady pressure. Peck the bit — drill a few seconds, back out to clear chips, repeat.
Installing a deadbolt in a hardwood door: A 1 inch or larger hole saw in hardwood: low gear, 300-500 RPM, and back the saw out often to clear sawdust. A fast hole saw in hardwood burns the wood and dulls the teeth.
Putting a hole in an acrylic sheet: Moderate speed, sharp bit, and clamp the sheet to a scrap board underneath. The backing board stops the bit from breaking out and cracking the acrylic on exit.
Drilling tile: Diamond or carbide-tipped bits, slow speed, and water as coolant. Speed matters less here than keeping the bit wet and letting it grind rather than hammer.
When Speed Doesn’t Fix the Problem
Sometimes the right speed still gives a bad hole, and the culprit is elsewhere. A dull bit at the perfect speed still rubs and overheats. A bit held at an angle wanders no matter the RPM. And a workpiece that isn’t clamped will spin or lift, which no speed setting can fix. If you’ve slowed down, added fluid, and the hole still looks bad, check the bit’s sharpness and your clamping before blaming the chart.
The Takeaway
Drill speed is one of those settings that feels optional until you see the difference it makes. Big bit, slow speed. Hard material, slow speed. Small bit in soft material, let it run. Keep this chart near your drill press or bookmarked on your phone, and you’ll stop burning bits, stop cracking plastic, and start getting clean holes the first time — which, in a workshop, is time saved twice over.