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# Drawing Scales

## Commonly used blueprint drawing scales.

Blueprint drawings are typically drawn in

• 1:20, 1:50 or 1:100 (SI-units)

or

• 1/4" or 1/8"  (Imperial units, US)

scales.

### SI-Units

To scale a SI-drawing

• multiply the measurement on the drawing with the denominator

where the denominator is the number after the colon.

#### Example - Blueprint Drawing Scale 1:50

An actual length of 1 cm is measured on a 1:50 blueprint floor plan. The physical length can be calculated as

(1 cm) 50 = 50 cm

Imperial Units - US

A 1/4" scale means that each 1/4" (inch) on the plan counts for 1' (feet) of actual physical length.

To scale a blueprint in imperial units to actual feet

• multiply the measurement on the drawing (in inches decimal equivalent) with the denominator

where the denominator is the bottom number.

Example - Blueprint Drawing Scale 1/4"

An actual length is measured to 1-3/8" on a 1/4" blueprint floor plan. The physical length can be calculated as

(1-3/8 inch) 4 = (1.375 inch) 4

= 5.5 feet

= 5' 6"

• 1:1
• 1:5
• 1:10
• 1:20

• 1:20
• 1:10
• 1:5

• 1:40
• 1:50

• 1:80
• 1:100
• 1:200

• 1:500

• 1:1000
• 1:1250
• 1:2500

• 1:100000
• 1:50000
• 1:25000
• 1:10000

## Related Topics

• ### Basics

Basic engineering data. SI-system, unit converters, physical constants, drawing scales and more.
• ### Drawing Tools

2D and 3D engineering drawing tools.

## Related Documents

• ### Area Survey App

Online app that can be used to make an exact plot of a surveyed area - like a room, a property or any 2D shape.
• ### Blueprint Letters

Letters commonly used to differentiate blueprint drawings.
• ### Builder's to Surveyor's Measurements

Convert builder's measurements to surveyor's measurements.
• ### Building Tolerances

Typical tolerances for floors, walls, columns and more.
• ### Drawings - Sheet Layouts

Standard drawing sheets layouts.
• ### Drawings - Standard Metric Sizes

Standard metric drawing sheet sizes.
• ### Golden Section

Golden Section also called the Golden Mean.
• ### HVAC Diagram - Online Drawing Tool

Draw HVAC diagrams online with this Google Drive drawing tool.
• ### Lengths and Areas vs. Mapping Scales

Convert lengths areas between different mapping scales.
• ### P&ID Diagram - Online Drawing Tool

Draw P&ID diagrams online in the browser with Google Docs.
• ### Paper Drafting Sizes - Comparing ISO and U.S. Drawing Sheets

ISO vs. U.S. and Canadian drawing sheets.
• ### Paper Drafting Sizes - ISO 216 series A, B and C

ISO 216 A, B and C drawing series - dimensions of regular, oversized and envelope sheets.
• ### Paper Sizes - commonly used in U.S. Offices

Office paper sizes as Letter, Legal, Tabloid and more.
• ### Paper Sizes - Imperial

Printing and drawing papers sizes.
• ### Scales of Objects

The relative scale of objects.
• ### US Standard Architectural Drawing Sizes

US architectural drawing sizes and formats.
• ### US Standard Engineering Drawing Sizes

US engineering drawing sizes based on ANSI/ASME Y14.1.

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## Citation

• The Engineering ToolBox (2010). Drawing Scales. [online] Available at: https://www.engineeringtoolbox.com/scaling-blueprint-drawings-d_1704.html [Accessed Day Month Year].

Modify the access date according your visit.

4.19.9

.