MM to GSM Calculator

Convert material thickness (millimeters) to GSM (grams per square meter) using density. Perfect for paper, packaging, textile, and plastic industries.

Industrial Calculator:

Calculate GSM from thickness and density. Essential for paper manufacturing, packaging design, and material specification.

MM to GSM Converter

Mode

Material thickness value

Material density

Calculation Results

Enter thickness and density

then click "Calculate" for GSM

MM to GSM Calculator

If you work with paper, plastic sheets, cardboard, or fabric, you've probably needed to convert thickness in millimeters to GSM. Since GSM measures grams per square meter and millimeters measure thickness, the two aren't directly convertible without knowing one key factor: material density.

The Formula Behind It

Conversion Formula
GSM = Thickness (mm) × Density (g/cm³) × 1000
Why multiply by 1000?
Because 1 mm = 0.1 cm and 1 m² = 10,000 cm², the unit adjustment simplifies to multiplying by 1000.

Let's say you have a plastic sheet that's 0.5 mm thick with a density of 0.8 g/cm³:

Example:
Thickness = 0.5 mm
Density = 0.8 g/cm³

GSM = 0.5 × 0.8 × 1000 = 400 GSM

MM to GSM Conversion Table

Below is a reference table showing various thickness-to-GSM conversions across different materials:

Thickness (mm) Density (g/cm³) GSM Result
0.1 mm 0.7 70 GSM
0.2 mm 0.7 140 GSM
0.3 mm 0.8 240 GSM
0.4 mm 0.8 320 GSM
0.5 mm 0.8 400 GSM
0.5 mm 1.4 700 GSM
0.6 mm 0.9 540 GSM
0.7 mm 0.7 490 GSM
0.8 mm 1.0 800 GSM
0.9 mm 1.2 1080 GSM
1.0 mm 0.9 900 GSM
1.0 mm 2.7 2700 GSM
1.2 mm 0.7 840 GSM
1.5 mm 1.35 2025 GSM
2.0 mm 1.4 2800 GSM
2.5 mm 0.8 2000 GSM
3.0 mm 2.7 8100 GSM
0.05 mm 0.9 45 GSM
0.15 mm 1.0 150 GSM
0.25 mm 1.35 337.5 GSM
4.0 mm 0.6 2400 GSM
5.0 mm 1.4 7000 GSM
Pro Tip:

Always verify the exact density of your specific material. Standard values vary — paper can range from 0.7 to 1.2 g/cm³ depending on type and moisture content. Using the wrong density will give you inaccurate GSM results.