Pt to MM Conversion Chart

Pt to MM Conversion Chart

There are two different “points”, and they are not close. If you are working in type, design software or CSS, a point is 1/72 inch = 0.3528 mm, so 12 pt is 4.23 mm. If you are specifying paperboard or packaging, a caliper point is 0.001 inch = 0.0254 mm, so 12 pt board is 0.305 mm. The two differ by a factor of about 14. Both conversions are below.

Table of Contents

  1. Which Point Are You Converting?
  2. Typographic points to mm (1 pt = 1/72 inch)
  3. Caliper points to mm (1 pt = 0.001 inch) — the packaging one
  4. What Does “Pt” Mean?
  5. Pt to MM Conversion Chart
  6. Why These Conversions Matter
  7. Real-World Packaging Examples
  8. Conclusion: Converting Thickness Into Confidence
  9. Frequently Asked Questions

Which Point Are You Converting?

When you’re working with packaging materials, every fraction of a millimeter matters. Designers talk in “points,” converters talk in “microns,” and production teams talk in “millimeters.” Before long, everyone’s asking the same question: how thick is it, really?

That’s where a pt to mm conversion chart comes in. Whether you’re printing labels, laminating paper, or speccing new pouch material, understanding how points translate to millimeters helps you avoid costly mismatches between design intent and manufacturing reality.

Typographic points to mm (1 pt = 1/72 inch)

This is the point used in Word, Illustrator, InDesign, Figma and CSS — font sizes, leading, stroke widths and margins. One point is exactly 1/72 of an inch, which is 0.352778 mm. To convert, multiply points by 0.352778; to go back, multiply millimeters by 2.8346.

Points (pt) Millimeters Microns Inches
6 2.117 mm 2117 µm 0.0833 in
7 2.469 mm 2469 µm 0.0972 in
8 2.822 mm 2822 µm 0.1111 in
9 3.175 mm 3175 µm 0.1250 in
10 3.528 mm 3528 µm 0.1389 in
11 3.881 mm 3881 µm 0.1528 in
12 4.233 mm 4233 µm 0.1667 in
14 4.939 mm 4939 µm 0.1944 in
16 5.644 mm 5644 µm 0.2222 in
18 6.350 mm 6350 µm 0.2500 in
20 7.056 mm 7056 µm 0.2778 in
24 8.467 mm 8467 µm 0.3333 in
28 9.878 mm 9878 µm 0.3889 in
30 10.583 mm 10583 µm 0.4167 in
36 12.700 mm 12700 µm 0.5000 in
48 16.933 mm 16933 µm 0.6667 in
60 21.167 mm 21167 µm 0.8333 in
72 25.400 mm 25400 µm 1.0000 in

Handy checks: 72 pt = 1 inch = 25.4 mm exactly, and 36 pt = 12.7 mm. A 12 pt body font is 4.23 mm tall in points terms — not 0.3 mm, which is what you would get if you used the paperboard conversion below by mistake.

Caliper points to mm (1 pt = 0.001 inch) — the packaging one

Everything from here down uses the paperboard caliper point. This is the one your printer or converter means when they quote “16 pt board”. It measures physical thickness, not type size.

What Does “Pt” Mean?

In packaging and printing, pt (points) measures thickness, not weight. One point equals 1/1000 of an inch (0.001”). The thicker the material, the higher the point value.

You’ll see point measurements most often in:

  • Folding cartons (10 pt to 24 pt board)
  • Label stock and hang tags
  • Cardboard and paperboard packaging

For flexible packaging, points are less common than microns or mils — but the conversions still matter when aligning specs across printers and material suppliers.

Pt to MM Conversion Chart

Points (pt) Millimeters (mm) Microns (µm) Inches (in)
1 pt 0.0254 mm 25.4 µm 0.001 in
5 pt 0.127 mm 127 µm 0.005 in
10 pt 0.254 mm 254 µm 0.010 in
12 pt 0.305 mm 305 µm 0.012 in
16 pt 0.406 mm 406 µm 0.016 in
20 pt 0.508 mm 508 µm 0.020 in
24 pt 0.610 mm 610 µm 0.024 in
30 pt 0.762 mm 762 µm 0.030 in

Note: Thickness can vary slightly by paper density, coating, and lamination type.

For technical details on how measurement units like points, inches, and millimeters are standardized in printing and packaging, visit the National Institute of Standards and Technology’s Weights & Measures division.

Why These Conversions Matter

Thickness determines how your packaging looks, feels, and runs on-press. A few extra points might not sound like much, but it can affect:

  • Folding performance: Heavier boards crack if scored incorrectly.
  • Sealing temperature: Thicker laminates need more dwell time.
  • Print registration: Substrate thickness changes focus and alignment.

When specs are converted correctly, everything from die-cuts to heat-seal jaws works exactly as planned. You’ll see point measurements most often in folding cartons, label stock, and cardboard packaging used for retail and coffee products.

Real-World Packaging Examples

  • 12 pt C1S Board → roughly 0.305 mm — common for paper pouches or folding cartons.
  • 18 pt Recycled Board → about 0.457 mm — used for retail cartons needing rigidity.
  • 20 pt Paper Laminate → 0.508 mm — typical for header cards and premium inserts.

These conversions help designers and co-packers speak the same language as material suppliers — reducing guesswork and production waste.

Conclusion: Converting Thickness Into Confidence

Knowing your pt-to-mm conversion is more than a math exercise — it’s quality control. Understanding exactly how thick your packaging stock is ensures accurate dielines, cleaner seals, and consistent shelf appeal.

At Hawk Packaging, we help brands fine-tune every layer of their material — from paper weights to film gauges — so your packaging performs perfectly in both form and function. Hawk Packaging supports brands nationwide, including across Arizona and Colorado, delivering fast turnaround and dependable packaging quality.

Frequently Asked Questions

Is 1 pt 0.0254 mm or 0.3528 mm?
Both, depending on which point you mean. A paperboard caliper point is 0.001 inch, which is 0.0254 mm. A typographic point, used in design software and CSS, is 1/72 inch, which is 0.3528 mm. They differ by a factor of about 14.

How thick is 16 pt cardstock in mm?
Using the paperboard caliper point, 16 pt is 0.406 mm, or about 406 microns.

What is the difference between 14 pt and 16 pt board?
Roughly 0.05 mm of thickness: 14 pt is 0.356 mm and 16 pt is 0.406 mm. The heavier board is stiffer and feels more substantial, which is why it costs more.

How do I convert paperboard points to GSM?
There is no fixed conversion, because points measure thickness and GSM measures weight per square meter. The relationship depends on the density of the board, so two sheets at the same caliper can differ in GSM.

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