Measuring Leather Thickness at Home

You can check leather thickness at home with a slotted gauge or a caliper. Both take a minute. The trick is where you measure and how hard you squeeze.

Two kinds of tool

A slotted or template gauge has a graded slot with markings. You insert the leather into the slot so that it is snug but not compressed, then read the mark¹. The numbers on it may show ounces, millimetres, or both¹.

A caliper clamps the leather between two points or plates. A leather caliper can read in millimetres and ounces, on a dial that's digital or analogue¹. A traditional caliper usually provides measurements in millimetres¹. If you want ounces, work them out from the conversion page.

Which one suits you? A slotted gauge is quick for a yes-or-no check. A caliper gives you a number to write down.

Where to measure

Thickness will vary across the entire span of a hide¹. Leather is thinnest along the edge, so it's best to measure as far in from the edge as possible¹.

That's why a gauge with a long throat is more accurate than a template, which can only take the edge of the leather¹.

A simple routine

• Pick a spot well in from the edge.
• Close the caliper until it touches, with no squeeze.
• Read the number.
• Move along the piece and read again.
• Note the spread. If readings differ, that's normal for a natural material.

Don't crush the leather to get a lower number. Soft leather gives under pressure, and a squashed reading is a false one. The same no-squeeze tip is our own common sense for a caliper.

What to do with the number

Compare your reading with a conversion table. One ounce is about 1/64 inch, or 0.4 mm², so a reading of 1.6 mm sits near 4 oz.

Don't expect a perfect match. One supplier says hides rarely measure to the exact 1/64 inch throughout³. If your piece reads a little over or under, that's ordinary. The reasons for the spread are in this explainer.

Take the reading where the finished item will need it most. For a strap, that's along the length. For a wallet, check the panel that takes the stitching.

Write your readings down, with the spot you measured. Next time you order the same leather, you'll have something to compare against.

Troubleshooting an odd reading

Got a number that looks wrong? Check these first.

• Is the leather lying flat between the jaws, with no curl?
• Did you measure near the edge? Move in and try again.
• Is the gauge reading zero when it's closed on nothing?
• Is the leather being squeezed?

Fix those and measure again. If it still looks off, measure a second piece for comparison.