Paper Weight 101 Guide

Navigating paper weights can feel like trying to learn a new language where everyone is shouting different numbers at you. Whether you’re an illustrator looking for that perfect "tooth" or a journaler tired of ink bleeding through the page, understanding these measurements is the first step to stationery nirvana.
Here is your Paper Weight 101 guide.

1. The Big Three: GSM vs. LB vs. KG

The reason paper weights are so confusing is that different regions and industries use different systems.

 GSM (Grams per Square Meter)

• What it is: The metric standard used globally. It measures how much a single square meter (1m×1m) of that paper weighs.
• Why it's great: It is consistent. 100 GSM is 100 GSM, regardless of the size or type of paper. It is the easiest way to compare thickness across brands.
  

LB (Pounds)

• What it is: The US standard. It measures the weight of a "ream" (usually 500 sheets) of paper in its uncut "basis size."
• Why it's tricky: The "basis size" changes depending on the paper type. 80 lb "Text" paper is much thinner than 80 lb "Cover" (cardstock) paper. This is why you'll often see "80lb Text" or "100lb Cover."
  

KG (Kilograms)

• What it is: Primarily used in Japan (B-base weight). Similar to the LB system, it’s the weight of 1,000 sheets of paper cut to a specific Japanese industry standard size.
• Why it's used: You’ll see this mostly on high-end Japanese papers like Midori or Tomoe River.

Pro-Tip: If you want a universal "thickness" gauge, look for the GSM. It’s the most reliable way to tell if a paper is "beefy" or “wispy.”

2. Understanding Paper Weight (GSM)

The weight of paper, measured in grams per square metre (GSM), determines its thickness and durability against erasing, layering, and moisture. 

• 70–100gsm (Light): Best for rapid practice sketches and ideation. It is prone to buckling if wet media is used.
• 120–150gsm (Medium): The standard for everyday sketching and light ink work. It offers a balance between quality and cost.
• 180–250gsm (Heavy): Ideal for finished illustrations involving heavy shading, markers, or light washes. This weight resists warping and handles repeated erasing well.
• 300gsm+ (Extra Heavy): Essential for heavy watercolour, gouache, or multi-layered mixed media to prevent "cockling" (buckling)

3. Texture & Surface Finish

The "tooth" or grain of the paper dictates how much pigment it "grabs" and how smoothly your pen glides.

• Hot Pressed (HP / Smooth): Completely smooth with no visible grain. It is the go-to for technical drawing, botanical art, and fine-line ink work.
• Cold Pressed (CP or "NOT" / Medium Texture): A versatile "all-rounder" with a slight texture. It provides enough tooth for coloured pencils and graphite while still allowing for detail.
• Rough: Heavy texture that adds depth to landscapes and expressive charcoal or pastel work. It is generally avoided for fine technical pens as the nibs can snag

4. Archival & Environmental Considerations

• Acid-Free: Always ensure your paper is acid-free to prevent yellowing or deterioration over time.
• Cotton vs. Wood Pulp: 100% Cotton paper is the gold standard for professional work; it is stronger, more absorbent, and allows for extensive "scrubbing" and lifting of colour. Wood-free or wood-pulp papers are excellent, cost-effective alternatives for students

Top Paper for Illustrators

Illustrators need paper that can handle friction (erasing), heavy ink loads, or water without warping (cockling).

The Best Choice by Category

• Best for Professional Illustration & Archival Quality: Strathmore 500 Series Bristol (Plate finish) is the industry standard due to its 100% cotton composition, which ensures it will not yellow over time. Its surface is specifically designed to handle the most rigorous technical pen work without feathering.
• Best for Mixed Media & Wet Strength: Stillman & Birn Zeta Series is the winner for artists using a mix of watercolour washes and fine-line ink. It is internally and surface sized to provide "exceptional wet strength" that prevents buckling even under multiple washes.
• Best for Scanning & High Contrast: Canson XL Bristol is highly recommended for its bright white surface, which helps illustrations "pop" during the scanning process.
• Best for Manga Production: Deleter B4 Manga Manuscript is essential for professional comic layouts because its smooth surface is specifically sympathetic to sharp metal nibs like G-pens

The Best Sketchbook Choice

The Illustrator's Choice: Etchr Lab Sketchbooks
If you want a sketchbook that feels like a professional piece of equipment, Etchr is the current industry darling.

The Weight: 230 GSM or 300 GSM.

The Material: 100% Cotton. This is the "magic" ingredient. Wood-pulp paper (standard) stays wet on the surface, while cotton absorbs and holds pigment properly.

Why it’s the winner: It comes in "Cold Press" (textured) for watercolours or "Hot Press" (smooth) for fine liners and markers. It opens perfectly flat, which is a godsend for scanning your work later

Top Paper for Journalers

Journalers usually look for "fountain pen friendliness"—paper that resists feathering (ink spreading) and ghosting (seeing writing on the other side)

• Under 60 GSM: Very thin (tracing paper, onion skin).
• 80–100 GSM: Standard office paper/quality notebook paper.
• 120–150 GSM: Heavyweight paper, good for light sketching.
• 200+ GSM: Cardstock/Bristol; can handle markers and light paint.
• 300+ GSM: Heavy watercolor paper

The Journaler's Choice: Hobonichi Techo (Tomoe River Paper)

If you are a pen enthusiast, you have likely heard of Tomoe River Paper. It is the "holy grail" of journaling.

The Weight: 52 GSM (Incredibly thin).

The Experience: Despite being thin like onion skin, it is virtually bleed-proof. You can use a heavy fountain pen or even a light watercolor wash, and it won't bleed through to the other side.

Why it’s the winner: Because the paper is so thin, a notebook with 400 pages is still slim enough to carry everywhere. It has a unique "crinkle" sound when the pages are full of ink that journalers find highly addictive.
🛠️ The "Hybrid" Choice: Midori MD Cotton
If you do a bit of both (writing and light sketching) and hate the "clinical" bright white of office paper, this is your best bet.

The Weight: 80 GSM (but feels sturdier).

The Vibe: It’s a warm, creamy off-white.

Why it’s the winner: It has a slight "tooth" (texture). When you write, you can feel the pen on the paper, and when you sketch with a pencil, the graphite grips the page beautifully.