A scale ratio tells you how a model, map, or drawing relates to its real-world size — for example, 1:24 means every 1 unit on the model equals 24 units in reality. Enter your Real Size and its unit, then set your Scale Numerator and Scale Denominator to define the ratio. Select your preferred Scale Size Unit to get the Scale Size, along with the decimal Scale Factor and formatted Scale Ratio.
Scale Size
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Scale Factor
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Scale Ratio
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A scale factor is the ratio that describes how much a drawing or model has been enlarged or reduced compared to the actual object. It's calculated by dividing the scaled size by the real size.
To calculate scale from a drawing, measure a known dimension on the drawing and divide it by the actual real-world dimension. This gives you the scale factor, which can then be expressed as a ratio.
No, scale factor can be greater than, less than, or equal to 1. If it's greater than 1, the scale drawing is larger than the actual object. If less than 1, the drawing is smaller than the actual object.
A common example is architectural drawings at 1:100 scale, meaning 1 unit on the drawing represents 100 units in real life. So a 1cm line on the drawing represents 100cm (1 meter) in reality.
To convert between scales, first calculate the actual real-world size from your current scale, then apply the new scale factor to get the measurement in the target scale.
Common architectural scales include 1:100, 1:50, 1:20 for floor plans, and 1:500 or 1:1000 for site plans. The choice depends on the level of detail needed and drawing size constraints.
Yes! This calculator works perfectly for model scales. Popular model train scales include HO (1:87), N (1:160), and O (1:48). Model car scales include 1:18, 1:24, and 1:64.
The calculator provides highly accurate conversions with precision up to 4 decimal places. However, always consider manufacturing tolerances and measurement precision in real-world applications.