Architectural scale calculator | Free Online Converter

Our free architectural scale calculator can convert the real size of object to scaled size. This online tool is ideal if you are working with floor plans, site plans, sectional views, or elevation views.









How our Architectural scale calculator work?

~ Step 1 ~

Type the real length of the object.

~ Step 2 ~

Choose from the most common architectural scale ratios.

~ Step 3 ~

The architectural scale converter will generate the results.
architectural scale calculator

What is an architectural scale?

The scale allows us to understand the relation between the size of real objects and their size on architectural drawings. The scale helps architects accurately represent the interior and exterior of building in smaller and more practical size that will fit on paper. The architectural scale converter on our website has a wide range of usage. It can help you with calculations necessary for drafting floor plans, sectional views, location plans, or construction details.

How does an architectural scale calculator work?

1/4˝ = 1´-0˝ is one of the architect scales used for drawing buildings and structures. This scale shrinks everything so if there is something in the real world with a length of 1 foot then it will have only 1/4 inch in the architectural drawing.

The scale includes 3x values. 1.) Length in the drawing 2.) Colon “:“ or equals “=“ 3.) Length of the real object. If you have 1:10 scale then 1 (unit) in the drawing is 10 (units) in the real world.

~ Example of calculation: ~

1 : 10
100 cm : 10
Win rate = 50 / 100
Result = 10 cm

~ Example of calculation: ~

1/4 inch = 1 feet
16 x 1/4 inches = 16 x 1 feet
4 inches = 16 feet

The most common architectural scales

These are the most often used scales that you spot on technical drawings. Our architectural scale calculator will help you with calculations of these scales.

Floor plans and Elevation views

1:100, 1:50, 1/8"=1'-0", 1/4"=1'-0"



1:10, 1:2, 1:20, 3/4"=1'-0", 1-1/2"=1'-0"


Sectional views

1:25, 1:50, 1/2''=1'0, 1/4''=1'0


Site plans

1:500, 1:200, 1/16''=1'0


Location Plans

1:1250, 1:1000



1:20000 and more

What units of measure is my floor plan using?

Scales on floor plans usually relate to inches or millimeters. If you are located in the USA you will be working in the imperial system (in, ft, yd, mi, h, ch, lea, fur, th). If you are in Europe or Australia, it will be the metric system (mm, cm, dm, m, km). Architects in Canada work with both of these systems. If you look at the dimensions in the floor plan, you will immediately know if it's using the metric or imperial system.

What do architectural plans show?

Architectural drawings include floor plans, sections, and elevation views. These types of drawings are representing building design and construction. Horizontal views of buildings are most commonly seen on architectural plan sheets.

Architectural plans show construction workers building details so they can know where to place doors, how many floors will have the building, or what materials they have to use. The construction stage of a new building is not possible without proper technical drawings.

Why do Architects calculate scale?

Representing reality on the piece of paper is only possible through scaling. It's practical to change actual measurements of objects so your architectural and technical drawings fit on the page or your models fit on the table. You would need a lot of paper to draw 10 meters line, but if you use 1:100 scale then you have to draw only 10 centimeters. It's pretty smart, don't you think? Although, modern CAD software can work even with 1:1 scales.

Engineer Scale vs Architect Scale vs Metric Scale

Engineer Scale vs Architect Scale vs Metric Scale

The engineering scale is more accurate than the architect’s scale and uses a decimal scaling scheme while an architect's scale is using fractional scaling.

Both engineering scale and architect’s scale are meant for drafting plans or obtaining measurements from existing technical drawings, or drawings of buildings, structures, and exterior / interior rooms.

The base measuring unit of the metric scale is millimeter and 1:1 represents full size on the metric scale while 1:2 is half scale. Half scale means that one unit on the drawing is equal to two units on the actual object.

Architect scales are converting inches into feet. 1/4 inch = 1 foot means that 0.25 inch in the drawing is 1 foot in reality.

The metric scale can be read from left to right, the same as the engineering scale. An architect's scale, on the other hand, is possible to read from both sides.

Share This Architectural scale converter

We appreciate it very much