About ISO 216 A-Series Paper Converter & GSM Weight Calculator
Dedicated ISO 216 A-series engineering utility. Visualizes the sqrt(2) geometric folding tree from A0 down to A10, calculates exact sheet surface area in square meters, and computes individual sheet weights in grams and 500-sheet ream weights in kilograms based on paper density (GSM).
Key Capabilities & Features
- Calculates all ISO A-formats: 4A0, 2A0, A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10
- Interactive folding slider demonstrating 1:√2 geometric scaling
- Surface area in square meters (A0 = exactly 1.0 m²)
- GSM paper density weight calculator (single sheet in grams and 500-sheet ream in kg)
- Presets for 70 GSM copy paper, 80 GSM office, 120 GSM brochure, 250 GSM cardstock, and 350 GSM heavy cover
How to Use ISO 216 A-Series Paper Converter & GSM Weight Calculator
Select A-Size
Choose your A-series format (A0 through A10).
Set Paper GSM
Enter paper grammage (e.g. 80 GSM standard office paper).
View Weight & Area
Inspect individual sheet weight in grams for postage or ream weight in kilograms for freight shipping.
Privacy & In-Browser Execution Guarantee
100% private local computation.
Frequently Asked Questions
Why does A0 have a surface area of exactly 1 square meter?
The ISO 216 standard was purposefully engineered with A0 having an area of exactly 1 m² and an aspect ratio of 1:√2 (841 x 1189 mm). Consequently, 80 GSM paper means an A0 sheet weighs exactly 80 grams, an A1 weighs 40g, and an A4 weighs 5g.
How much does a 500-sheet ream of 80 GSM A4 paper weigh?
An A4 sheet of 80 GSM weighs exactly 5 grams. A standard ream of 500 sheets weighs 2.5 kg (5.5 lbs).