News - How Thick Is 3/4 Inch Plywood in mm? 1/2″ & 5/8″ Guide

Quick Answer: Plywood Thickness in mm
How Thick Is 3/4 Inch Plywood in mm?
How Thick Is 1/2 Inch Plywood in mm?
How Thick Is 5/8 Inch Plywood in mm?
Nominal vs Actual Plywood Thickness
Plywood Thickness Conversion Chart
What Plywood Thickness Should B2B Buyers Order?
Why Plywood Thickness Tolerance Matters
How to Specify Plywood Thickness in a Purchase Order
How to Choose a Plywood Supplier for Bulk Orders
Frequently Asked Questions
Final Takeaway

How Thick Is 3/4 Inch Plywood in mm? 1/2″ & 5/8″ Plywood Thickness Guide

If you’re buying plywood for a construction project, furniture factory, wholesale business, or import program, a simple thickness question can prevent an expensive mistake:

How thick is 3/4 inch plywood in mm?

The mathematical answer is 19.05 mm. But plywood purchasing isn’t quite that simple. A sheet sold as 3/4 inch plywood may have a nominal thickness that differs slightly from its measured thickness.

The same issue applies to 1/2 inch plywood and 5/8 inch plywood.

For international buyers, understanding the difference between inch specifications, metric equivalents, and actual manufactured thickness is essential.

Here is the quick reference:

Nominal Thickness	Exact Inch-to-mm Conversion	Common Metric Specification
1/2 inch	12.70 mm	12 mm
5/8 inch	15.875 mm	15 mm
3/4 inch	19.05 mm	18 mm or 19 mm
1 inch	25.40 mm	25 mm

The important point is that these metric sizes are not automatically exact conversions. The specification used by the manufacturer and the applicable standard must be confirmed before ordering.

Quick Answer: Plywood Thickness in mm

If you only need the conversion, these are the basic numbers:

1/2 inch = 12.7 mm
5/8 inch = 15.875 mm
3/4 inch = 19.05 mm

However, plywood is often sold using nominal thickness categories. Therefore, a buyer asking for “3/4 inch plywood” shouldn’t assume that every manufacturer will produce a sheet measuring exactly 19.05 mm.

For international B2B purchasing, it is better to specify the required nominal thickness, acceptable tolerance, plywood standard, and intended application.

This is especially important when plywood will be machined, laminated, fitted into a frame, or combined with other materials.

How Thick Is 3/4 Inch Plywood in mm?

The mathematical conversion is straightforward:

3/4 inch × 25.4 = 19.05 mm

So, strictly speaking, 3/4 inch plywood is 19.05 mm when converting the imperial measurement directly.

In commercial plywood markets, however, you may see products described as 18mm, 19mm, or 3/4 inch depending on the manufacturer, market and applicable standard.

For a bulk buyer, this distinction matters.

If you’re purchasing plywood for cabinet components, flooring substrates, structural applications, pallets, or other precision work, don’t rely on the product name alone.

Ask your supplier:

What is the nominal thickness?
What is the actual production thickness?
What tolerance applies?
Which standard is the product manufactured to?
Will the supplier provide a sample before mass production?

For a large order, these questions are much more valuable than simply asking for the lowest price.

How Thick Is 1/2 Inch Plywood in mm?

1/2 inch equals 12.7 mm.

The calculation is:

0.5 × 25.4 = 12.7 mm

You will often encounter 12mm plywood in international product specifications. But 12mm is not mathematically identical to 1/2 inch.

The difference is:

12.7 mm − 12 mm = 0.7 mm

For general applications, that difference may not matter. For a precision manufacturing process, it might.

If your project drawings specify 12mm, order 12mm rather than assuming that “1/2 inch” is interchangeable.

Likewise, if your customer specifically requires 1/2 inch plywood, communicate that requirement clearly to the manufacturer and confirm the applicable tolerance.

How Thick Is 5/8 Inch Plywood in mm?

5/8 inch equals 15.875 mm.

The conversion is:

0.625 × 25.4 = 15.875 mm

In many international markets, buyers may encounter 15mm plywood as a nearby metric specification.

Again, 15mm and 5/8 inch are not exactly the same measurement.

The difference is approximately:

15.875 mm − 15 mm = 0.875 mm

That may be insignificant for some applications and critical for others.

When importing a container of plywood, the safest approach is to make the required thickness unambiguous in the purchase specification.

Nominal vs Actual Plywood Thickness

This is where many first-time plywood importers get confused.

A plywood thickness can be described by a nominal size, while the actual manufactured panel may measure slightly differently.

Why?

Manufacturing processes can affect final thickness. These include:

Veneer thickness
Number of veneer layers
Glue application
Hot pressing
Sanding
Moisture content
Production tolerances

For this reason, professional buyers should distinguish between:

Nominal thickness: The commercial thickness category used to identify the product.

Actual thickness: The physical thickness measured on the finished sheet.

If your application has tight dimensional requirements, specify the permitted tolerance as well as the nominal thickness.

Plywood Thickness Conversion Chart

Here is a practical reference for common plywood thicknesses:

Imperial Size	Exact Metric Conversion	Common Metric Reference
1/4″	6.35 mm	6 mm
3/8″	9.525 mm	9 mm
1/2″	12.70 mm	12 mm
5/8″	15.875 mm	15 mm
3/4″	19.05 mm	18–19 mm
7/8″	22.225 mm	21–22 mm
1″	25.40 mm	25 mm

This table is useful for initial product research, but it should not replace the technical specification required for a purchase order.

What Plywood Thickness Should B2B Buyers Order?

There isn’t one plywood thickness that works for every project.

The right choice depends on the load, span, panel construction, fixing method and end use.

Common purchasing applications include:

Application	Thickness Often Considered
Furniture components	9–18mm
Cabinet construction	12–18mm
Shelving	15–25mm
Construction panels	Project dependent
Packaging	5–18mm
Heavy-duty applications	18mm and above

These are general purchasing ranges, not engineering specifications.

For structural applications, the project engineer should determine the required panel construction and performance.

For wholesalers, customer demand is equally important. If your market regularly sells 12mm, 15mm and 18mm plywood, maintaining those specifications may be more useful than stocking unusual thicknesses.

Why Plywood Thickness Tolerance Matters

Two suppliers can quote the same nominal plywood thickness while producing panels with different measured dimensions.

That’s why experienced importers include tolerance requirements in their technical specifications.

Thickness tolerance can affect:

CNC machining
Edge banding
Lamination
Joinery
Door and cabinet dimensions
Flooring systems
Panel fitting
Finished-product quality

Before a large order, ask for a sample and measure several points across the sheet.

For a serious B2B program, third-party inspection can also be considered, especially when the shipment value is high.

How to Specify Plywood Thickness in a Purchase Order

Avoid writing only:

“3/4 inch plywood.”

A stronger specification would identify the complete requirement.

For example:

Plywood: Hardwood plywood

Nominal thickness: 18mm

Sheet size: 1220 × 2440mm

Face/back: Specified veneer grade

Core: Specified core material

Glue: Required glue class

Thickness tolerance: According to agreed standard

Quantity: Required number of sheets

Application: Furniture manufacturing

Packaging: Export packaging

This gives the factory a clear target and makes supplier quotations easier to compare.

For international trade, consistency is crucial. The same specification should be used in your RFQ, sample approval, purchase order and inspection documents.

How to Choose a Plywood Supplier for Bulk Orders

For project and wholesale procurement, the supplier’s ability to maintain consistent specifications is often more important than the first quotation.

When evaluating a plywood supplier, check:

Product range — Can the factory supply the thicknesses and sizes you need?
Manufacturing capability — Is the company actually equipped for your order volume?
Quality control — How are thickness, bonding and surface quality checked?
Samples — Can you approve a production sample before mass production?
Packaging — Is the plywood properly protected for international shipping?
Documentation — Can the supplier provide the required technical documents?
Communication — Can specifications be confirmed clearly in writing?
Production capacity — Can the supplier support repeat container orders?

For buyers sourcing from China, working directly with an experienced China plywood supplier can also simplify communication about metric and imperial specifications.

Dongstar provides plywood and other wood-based panel products for international B2B customers. For a project quotation, buyers should provide the required thickness, dimensions, grade, quantity and destination so the specification can be evaluated accurately.

Website: Dongstar

Frequently Asked Questions

How thick is 3/4 inch plywood in mm?

3/4 inch equals 19.05 mm by exact mathematical conversion. Commercial products may use nearby metric specifications such as 18mm or 19mm, depending on the product standard.

How thick is 1/2 inch plywood in mm?

1/2 inch equals 12.7 mm. A commonly available metric plywood specification is 12mm, but 12mm is not exactly the same as 1/2 inch.

How thick is 5/8 inch plywood in mm?

5/8 inch equals 15.875 mm. 15mm plywood is a common metric specification, but it should not automatically be treated as identical to 5/8 inch plywood.

Is 18mm plywood the same as 3/4 inch plywood?

Not exactly. 3/4 inch converts to 19.05mm, while 18mm is 1.05mm thinner. Whether 18mm can replace 3/4 inch depends on the project’s specification and tolerance requirements.

Is 12mm plywood the same as 1/2 inch plywood?

No. 1/2 inch is 12.7mm, while 12mm plywood is 0.7mm thinner. They may be interchangeable in some applications but shouldn’t be treated as identical without checking the specification.

Should I order plywood in inches or millimeters?

Use the unit specified by your project and market. For international manufacturing and sourcing, millimeters are often clearer because metric sheet dimensions and thicknesses are widely used. The most important point is to state the exact specification and tolerance.

How can I avoid thickness problems when importing plywood?

Approve a sample, specify the required thickness and tolerance in the purchase order, and use the same specification for production and inspection. For high-value orders, consider independent pre-shipment inspection.

Final Takeaway

The basic conversions are easy:

1/2 inch = 12.7 mm
5/8 inch = 15.875 mm
3/4 inch = 19.05 mm

The harder part is understanding how those numbers relate to commercial plywood specifications.

For B2B buyers, the safest practice is to specify nominal thickness, actual tolerance, sheet dimensions, plywood type, grade and application rather than relying on an inch-based product name alone.

When you’re buying thousands of sheets, a small dimensional misunderstanding can become a large purchasing problem. A clear specification at the quotation stage is usually the cheapest form of quality control.

How Thick Is 3/4 Inch Plywood in mm? 1/2″ & 5/8″ Guide

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