ISO 216 · ISO 5457 · Engineering Reference
Engineering Drawing &
Drafting Templates
— Paper Size Guide
From understanding what a drawing is, to choosing the right paper — A4, A3, A2, A1, and A0 — for every type of engineering work.
What is Drawing & Drafting?
English, Hindi, Marathi, Gujarati, Tamil… and many more. We use these languages to communicate with others — to share ideas, information, and feelings.
"But Engineering Language is Quite Different."
A person Mr. X wants to create an Engineering Product. In his mind he can picture the object perfectly — its shape, size, and detail. But he cannot turn that idea into a real object by his mind alone. He needs external assistance.
Explaining the object in routine words is very difficult. So he takes a sheet of paper and shares his idea through Shapes & Sketches. By this Graphical Representation he conveys his idea to others clearly and precisely.
Engineering Drawing is a Graphical Language that communicates ideas and information from one mind to another.
Drawing is a form of visual art in which a person uses various drawing instruments to mark paper or another two-dimensional medium. Instruments include graphite pencils, pen and ink, paints, inked brushes, charcoal, chalk, pastels, markers, and more.
Digital drawing is the act of using a computer to draw. Common methods include a stylus or finger on a touchscreen, stylus-to-touchpad, or a mouse. Many digital art programs and devices support this.
A quick, freehand drawing — usually not intended as a finished work — is called a Sketch. It is the starting point before a formal drawing is prepared.
An artist who practices or works in technical drawing is called a Drafter, Draftsman, or Draughtsman.
Methods of Preparing Engineering Drawings
Engineering drawings are prepared by two most common methods:
Manual Drafting
Drawing on paper using physical instruments — set squares, compasses, scale rulers, and pencils — placed on a drawing board.
Using CAD Systems
Computer-Aided Design software (2D & 3D) that automates and accelerates the drafting process with precision and repeatability.
Manual Drafting
The basic procedure is to place the sheet of paper on a Drawing Board, which has a smooth flat surface. Drawings are then produced using instruments such as set squares, T-squares, compasses, dividers, and pencils of various grades.
Drawing Board Sizes:
| Board Designation | Size (mm) |
|---|---|
| B0 | 1000 × 1500 |
| B1 | 700 × 1000 |
| B2 | 500 × 700 |
| B3 | 350 × 500 |
Pencil Grades used in Manual Drafting:
| Hard Grades | Medium Grades | Soft Grades |
|---|---|---|
| 9H — Hardest | 3H — Hardest | 2B — Hardest |
| 8H | 2H | 3B |
| 7H | H | 4B |
| 6H | F | 5B |
| 5H | HB | 6B |
| 4H — Softest | B — Softest | 7B — Softest |
Hard grades (H) = finer, lighter lines for construction. Soft grades (B) = darker, bolder lines for outlines and lettering.
Using CAD Systems
Today, the mechanics of drafting have largely been automated through Computer-Aided Design (CAD). There are two types of CAD systems used for technical drawings:
Popular tools include ZWCAD, AutoCAD, SolidWorks, and ArchiCAD — used across Civil, Mechanical, Electrical, Architectural, and Piping & Structural disciplines.
Drawing Sheet Sizes — ISO 216 Standard
All engineering drawings use standardised A-series paper sizes defined by ISO 216. Each size has an aspect ratio of 1 : √2 (≈ 1:1.414), meaning each sheet is exactly half the area of the next larger size — making scaling between drawings precise and lossless.
Trimmed & Untrimmed Sheet Sizes (as per Indian Standard):
| Sr. | Designation | Trimmed L (mm) | Trimmed W (mm) | Untrimmed L (mm) | Untrimmed W (mm) |
|---|---|---|---|---|---|
| 1 | A0 | 1189 | 841 | 1230 | 880 |
| 2 | A1 | 841 | 594 | 880 | 625 |
| 3 | A2 | 594 | 420 | 625 | 450 |
| 4 | A3 | 420 | 297 | 450 | 330 |
| 5 | A4 | 297 | 210 | 330 | 240 |
| 6 | A5 | 210 | 148 | 240 | 165 |
Engineering Drawing Template — Borders, Margins & Layout
Every A-series engineering template follows a standard structure defined by ISO 5457 (borders & title blocks) and ISO 7200 (title block content). The layout is consistent across all sizes — only the frame dimensions change.
The left margin is always 25 mm — wider than all other margins — to allow for punch-hole filing without obscuring the drawing content. All other margins (top, right, bottom) are 10 mm.
| Size | Sheet (mm) | Left Margin | Other Margins | Usable Frame | Typical Use |
|---|---|---|---|---|---|
| A4 | 210 × 297 | 25 mm | 10 mm | 175 × 277 mm | Detail drawings, notes, parts lists |
| A3 | 297 × 420 | 25 mm | 10 mm | 262 × 400 mm | Assembly drawings, schematics |
| A2 | 420 × 594 | 25 mm | 10 mm | 385 × 574 mm | General arrangements, elevations |
| A1 | 594 × 841 | 25 mm | 10 mm | 559 × 821 mm | Large assemblies, building plans |
| A0 | 841 × 1189 | 25 mm | 10 mm | 806 × 1169 mm | Site plans, large plant layouts |
Which Paper Size Should You Choose?
A4 — 210 × 297 mm
The most common size for everyday documentation. Ideal for detail drawings of small components, parts lists, bills of materials, and general notes. Prints on any office printer and files easily in standard binders.
A3 — 297 × 420 mm
The most popular size for assembly drawings and electrical or hydraulic schematics. Provides enough space for multiple views while folding neatly to A4 for filing.
A2 — 420 × 594 mm
Suits general arrangement drawings, structural cross-sections, and building elevations where more spatial context than A3 can provide is needed.
A1 — 594 × 841 mm
Gives a large canvas for complex assemblies and full building plans. Folds down to A4 using the standard engineering fold — critical for drawing register filing.
A0 — 841 × 1189 mm
The largest standard A-series sheet — exactly one square metre in area. Used for site plans, large infrastructure layouts, and full plant/factory drawings. Requires plotter printing and proper rolled or flat-cabinet storage.
Best Practices for Engineering Drawing Templates
- Always use thesmallest sheet size that comfortably fits all required viewsat a standard scale. Oversized sheets waste material and are harder to handle and store.
- Stick tostandard scales— 1:1, 1:2, 1:5, 1:10, 1:20, 1:50, 1:100 — and note the scale clearly in the title block of every drawing.
- Fold A3 and larger sheetsdown to A4for filing. The title block must be visible on the front face — this is why the title block is always placed at the bottom-right corner.
- Use aconsistent title block across all sheet sizesin a project. Only the frame dimensions change; all text fields, fonts, and layout remain the same for professionalism and traceability.
- In CAD, set yourdrawing units and page size before placing any geometry. Retrofitting the sheet size later causes scaling errors and margin misalignment.
- For site drawings (A1, A0), always include anorth arrow and a graphic scale bar— since large drawings are often reproduced at non-standard sizes where the title block scale alone is insufficient.
Let's Sum Up
Engineering Drawing is a Graphical Language that communicates ideas from one mind to another. Drawings are prepared by two methods: Manual Drafting and CAD Systems.
They are produced on standardised A-series paper — A4, A3, A2, A1, and A0 — each with defined margins, a title block, a revision table, and a drawing frame as per ISO standards. Choosing the right paper size depends on the complexity of your drawing, the scale at which it must be readable, and the filing system in your organisation.
Get the template right from the start — correct borders, a complete title block, and proper margins — and every drawing you produce will be readable, reproducible, and professional for its entire working life.
