How to Use the Scale Calculator & Converter
This free scale calculator helps you convert between real-world measurements and scaled dimensions using any ratio. Whether you're drawing architectural floor plans at 1:100, building a model airplane at 1:72, or creating engineering blueprints, this tool delivers instant, accurate results.
Scale Converter — Real to Scaled (or Vice Versa)
Enter a real-world measurement and a scale ratio — the calculator instantly shows the scaled equivalent. Works both ways: enter the scaled measurement to find the real-world size. Supports millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Scale-to-Scale Converter
Already have a drawing at 1:50 and need it at 1:100? The Scale-to-Scale tab converts measurements between any two scale ratios. The formula is simple: multiply the source measurement by (source scale ÷ target scale).
Reverse Scale Finder
Have a model and the real object, but don't know the scale? Enter both measurements and the tool calculates the exact scale ratio for you. Perfect for identifying unknown model scales or verifying drawing accuracy.
Common Architectural Scales
1:20 for construction details, 1:50 for room plans, 1:100 for floor plans, 1:200 for building overviews, 1:500 for site plans, and 1:1000 for urban planning. US architects often use 1/4" = 1'-0" (equivalent to 1:48).
Common Model Making Scales
1:12 for dollhouses, 1:24 for diecast cars, 1:72 for aircraft models, 1:87 (HO) and 1:160 (N) for model railways, 1:350 for ship models.
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