Convert real dimensions to scale for architecture, models, maps and technical drawings. Free and accurate.
Scale is the ratio between the dimensions of a representation (drawing, model, map) and the real dimensions of the represented object. A scale of 1:100 means that 1 unit in the drawing corresponds to 100 units in reality — that is, the drawing is 100 times smaller than the real object. Scales are fundamental in architecture, engineering, cartography, model making, and any field that needs to represent large objects on reduced supports. The most common scales vary by application: 1:1 (actual size), 1:2 and 1:5 (mechanical details), 1:20 and 1:50 (interior plans and construction details), 1:100 (architectural building plans), 1:200 and 1:500 (urban planning and subdivisions), and 1:1000 (wide-area maps). In cartography, scales such as 1:25,000 or 1:50,000 are typical of topographic maps. This converter calculates the corresponding dimension between different scales: enter the value in one scale and get the equivalent in another. For example, a 5,000 mm (5 m) wall in reality (1:1) corresponds to 50 mm on a 1:100 plan. It is essential for architects, engineering students, model makers, and anyone working with scaled representations.
1:100 means 1 unit in the drawing = 100 real units. A 5 m (5,000 mm) wall becomes 50 mm in the drawing.
Multiply by the ratio of denominators: 50 ÷ 100 = 0.5. A 40 mm line at 1:50 becomes 20 mm at 1:100.
A 1:1 scale is actual size — the drawing has the same dimensions as the object, with no reduction.
Residential architectural plans typically use 1:50 or 1:100, depending on lot size and detail level.
Yes, completely free, with no registration and no usage limit.