Is 1 16 Or 1 32 Thicker

You're standing in the hardware aisle holding two drill bits. One says 1/16. On the flip side, the other says 1/32. Here's the thing — your project needs a pilot hole for a #6 screw. Which one do you grab?

If you hesitated, you're not alone. Fractions trip up more people than they should — especially when the denominator gets bigger and the number looks* larger but the actual size gets smaller.

The Short Answer

1/16 is thicker. Twice as thick, in fact.

1/16 inch = 0.0625 inches
1/32 inch = 0.03125 inches

That's the whole answer. But if you only came for the numbers, you're missing the part that actually helps you next time you're staring at a ruler, a caliper, or a box of sandpaper.

Why This Confuses People

Here's the trap: 32 is a bigger number than 16. In real terms, " That's how whole numbers work. Still, your brain wants to say "32 > 16, so 1/32 must be bigger. Fractions don't play by those rules.

The denominator tells you how many equal pieces the whole got chopped into. Because of that, more pieces = smaller pieces. A pizza cut into 32 slices gives you a much smaller slice than a pizza cut into 16.

This isn't just a math class thing. It shows up in:

• Drill bits and tap sizes
• Sandpaper grits (though that scale runs backward too — more on that later)
• Sheet metal gauges
• Wire gauges
• Feeler gauges for valve clearance
• Plastic sheeting thickness (mil vs. mm vs. fractions)

The "Mil" Trap

You'll also see thickness measured in mils*. One mil = 1/1000 inch. Not to be confused with millimeter.

• 1/32 inch ≈ 31 mils
• 1/16 inch ≈ 62 mils
• 1 mm ≈ 39 mils

If a spec sheet says "30 mil minimum" and you're holding 1/32" material, you're cutting it close. That's the kind of mistake that fails inspection.

How to Think About Fractions Without a Calculator

You don't need to convert to decimals every time. Build a mental ladder:

Each step down cuts the previous size in half. That's the pattern. Memorize the ladder once and you can climb it in either direction forever.

A Trick for the Shop

Keep a fraction-to-decimal chart taped to your drill press or bandsaw. Not because you can't do the math — because you shouldn't have* to do the math when you're halfway through a glue-up and the clock's ticking.

Better yet: buy a digital caliper that reads fractions and decimals. Press a button, toggle between 0.0625 and 1/16. Done.

Where This Actually Matters

Drill Bits and Pilot Holes

A #6 wood screw needs roughly a 1/16" pilot hole in hardwood, 3/32" in softwood. Grab the 1/32" bit by mistake and you'll split the board. Grab 1/8" and the threads have nothing to bite.

Twist drill sets often jump from 1/16 to 5/64 to 3/32. There's no 1/32 in most standard jobber sets — it's too fragile for general drilling. You'll find 1/32 in numbered* drill sets (#67 = 0.032") or letter* sets, mostly for precision work like jewelry, electronics, or gunsmithing.

Feeler Gauges

Setting valve lash on a small engine? The spec might be 0.Plus, 004–0. 006 inches. That's thousandths*, not thirty-seconds. A 1/32" feeler (0.031") is five times too thick. You'd be adjusting to the wrong spec entirely.

This is where people get in trouble — mixing fractional, decimal, and metric specs without converting.

Sandpaper — The Backward Scale

Sandpaper grit numbers run opposite* to fractions. Higher number = finer grit = thinner* abrasive particles.

• 60 grit = coarse, heavy stock removal
• 120 grit = medium
• 220 grit = fine, between coats
• 400+ grit = polishing

Don't confuse grit with thickness. A 1/32" thick sanding belt at 60 grit removes wood fast. A 1/16" thick belt at 400 grit polishes. Different dimensions entirely.

Sheet Goods

Plastic sheeting, vapor barrier, drop cloths — often sold in mils.

If you found this helpful, you might also enjoy how much is 1 lb of silver worth or how many grams is 5 pounds.

• 4 mil = thin painter's drop cloth (tears if you look at it wrong)
• 6 mil = standard vapor barrier
• 10 mil = heavy duty, crawl space liner
• 20 mil = pond liner territory

1/32" ≈ 31 mil. 1/16" ≈ 62 mil. If your plans call for 10 mil and you buy 1/16" pond liner, you just spent 6x the budget for no reason.

Common Mistakes People Make

Assuming the Bigger Denominator Means Bigger Size

We covered this. But it bears repeating because it's the #1 error. 1/64 is not bigger than 1/32.1/128 is not bigger than 1/64. The denominator is a divisor*, not a magnitude.

Mixing Gauge Systems

Sheet metal gauge, wire gauge, and drill gauge all use numbers — but they mean different things.

• 16 gauge steel ≈ 0.0598" (close to 1/16)
• 16 gauge wire (AWG) ≈ 0.0508"
• #16 drill bit = 0.177" (that's larger* than 1/8)

Same number. Which means three different thicknesses. Always check which gauge system the spec references.

Rounding Decimals Too Early

0.0625 rounds to 0.063.0.03125 rounds to 0.031. If you're designing a press fit and round both to two

decimal places, you've just eliminated the interference entirely. Day to day, the difference between 0. And 063" and 0. 0625" might be the margin between a press fit and a loose joint.

Forgetting Tolerance Stacks

When you're layering multiple fractional measurements, small errors compound. Two pieces at 1/16" each don't equal 1/8" — they equal 2/16" or 1/8" exactly. But if each was actually 0.Plus, 063" (rounded from 0. 0625"), your stack is now 0.Which means 126" instead of 0. 125". That thousandth of an inch might be the difference between parts fitting or binding.

Misreading Graduations

On a ruler marked in 1/32", the lines between each mark represent 1/64". Count them wrong and you'll measure 3/32" as 7/32". Digital calipers eliminate this error, but analog tools remain common on job sites where precision matters.

The Hybrid Approach

Most experienced craftspeople use both systems fluidly:

• Fractions for cutting and assembly — they're divisible by halves, quarters, eighths, which aligns with how we naturally divide materials
• Decimals for measuring and fitting — calipers read them directly, and thousandths matter for precision work

Keep a reference card handy until the conversions become second nature:

Fraction | Decimal | Mils
---------|---------|------
1/32     | 0.03125 | 31.25
3/32     | 0.09375 | 93.75
1/16     | 0.0625  | 62.5
5/64     | 0.078125| 78.125
3/16     | 0.1875  | 187.5

Practical Tools for Daily Work

Digital Calipers with Fraction Mode

Modern calipers can display measurements as fractions automatically. Set them to 1/32" resolution and they'll show 0.031" as 1/32". This eliminates mental math entirely.

Marked Drill Index

A labeled drill index shows both fractional and decimal sizes. Consider this: instead of hunting through a drawer, grab the #6 bit knowing it's 0. 078" or 5/64".

Fraction/Decimal Cheat Sheet

Tape this to your workbench:

1/32 = 0.031" = 31 mil
1/16 = 0.0625" = 62.5 mil
3/32 = 0.09375" = 94 mil
1/8  = 0.125" = 125 mil
5/32 = 0.15625" = 156 mil
3/16 = 0.1875" = 188 mil

Why This Matters Now More Than Ever

Modern manufacturing increasingly uses metric specifications, but imperial hardware dominates North American job sites. Which means a European engine blueprint might specify 1. 2mm valve clearance, while your American feeler gauges come in thousandths.

Convert 1.Still, 2mm to inches: 1. 2 ÷ 25.Plus, 4 = 0. 047". Now, that's between 1/32" (0. 031") and 3/64" (0.Here's the thing — 047"). You need the 3/64" feeler gauge, not the 1/16" you might grab by instinct.

The Bottom Line

Understanding fractional relationships isn't academic—it's the difference between a project that fits properly and one that requires force, glue, or replacement parts. When you know that 1/32" ≈ 0.031" ≈ 31 mil, you can move confidently between drill bits, sandpaper, vapor barriers, and caliper readings without second-guessing yourself.

Keep your reference materials close, measure twice, and remember: in fractional measurements, the denominator tells you how many pieces make a whole, not how big each piece is.