GSM to mm Calculator
Convert paper weight (GSM) to thickness (mm) using material density and paper type. Essential calculator for printing professionals, designers, and packaging manufacturers.
Convert paper specifications with material-specific accuracy. Perfect for print planning, packaging design, and material selection.
Paper Thickness Converter
Paper weight or thickness value
Paper type affects thickness calculation
Thickness Results
Enter GSM value and select paper type
Convert Paper Weight to Thickness
GSM tells you how heavy a sheet of paper is, but it does not directly tell you how thick it is. Two papers with the same GSM can feel very different in hand. A GSM to mm Calculator bridges that gap by estimating thickness using paper density and type.
This makes it useful for printing, packaging, design, and purchasing decisions where thickness matters.
Formula Used
The calculator uses a density-based formula:
Density values vary depending on paper type and composition.
Common Paper Thickness Examples
Here are typical thickness values for different paper types and GSM ranges:
| Paper Type | GSM | Thickness (mm) | Common Uses |
|---|---|---|---|
| Standard Printing | 80 | 0.107 | Office documents |
| Standard Printing | 100 | 0.133 | Letters, forms |
| Coated Paper | 120 | 0.109 | Magazines, brochures |
| Coated Paper | 150 | 0.136 | Glossy publications |
| Cardstock | 200 | 0.222 | Postcards, invitations |
| Cardstock | 250 | 0.278 | Business cards |
| Cardstock | 300 | 0.333 | Certificates, menus |
| Cardstock | 350 | 0.389 | High-quality cards |
| Kraft Paper | 120 | 0.150 | Brown paper bags |
| Recycled Paper | 90 | 0.129 | Eco-friendly printing |
| Photo Paper | 200 | 0.167 | Photographic prints |
| Newsprint | 45 | 0.064 | Newspapers |
| Bible Paper | 30 | 0.043 | Religious texts |
| Tracing Paper | 25 | 0.036 | Technical drawings |
| Tissue Paper | 15 | 0.021 | Gift wrapping |
| Onion Skin | 10 | 0.014 | Typewriter paper |
| Parchment | 50 | 0.071 | Certificates |
| Construction Paper | 100 | 0.133 | Arts and crafts |
| Index Card | 150 | 0.200 | Note cards |
| Playing Cards | 300 | 0.333 | Card games |
| Book Paper | 60 | 0.080 | Paperback books |
| Art Paper | 200 | 0.222 | Fine art prints |
| Carbon Paper | 40 | 0.053 | Duplicating |
| Airmail Paper | 20 | 0.029 | Lightweight letters |
Why This Calculator Helps
Many online tools assume all paper behaves the same, but this calculator avoids that mistake by allowing paper-type selection and custom density input, giving more realistic results.
For example, 100 GSM coated paper is thinner than 100 GSM cardstock, even though they weigh the same per square meter.
Paper thickness is about more than weight. By considering density and structure, this calculator turns GSM values into practical thickness estimates you can actually use.
Always test paper samples before committing to large print runs. This calculator provides estimates based on typical values, but actual paper thickness can vary by manufacturer.