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Reduction Ratios

September 19, 2020 Leave a Comment

Reduction ratios for ISO sheets & scales. A useful list to keep near the photocopier.

  • A3 to A4 = ~70%
  • A2 to A3 = ~70%
  • A2 to A4 = 50%
  • A1 to A2 = ~70%
  • A1 to A3 = 50%
  • A1 to A4 = ~35%
  • A0 to A1 = ~70%
  • A0 to A2 = 50%
  • A0 to A3 = ~35%
  • A0 to A4 = 25%
  • B1 to A1 = ~82%
  • B1 to B2 = ~70%
  • B1 to A2 = ~60%
  • B1 to B3 = 50%
  • B1 to A3 = ~40%
  • B1 to B4 = ~35%
  • B1 to A4 = ~28%
  • 1:1000 to 1:500 = 200%
  • 1:500 to 1:250 = 200%
  • 1:250 to 1:200 = 125%
  • 1:200 to 1:100 = 200%
  • 1:100 to 1:50 = 200%

 

Filed Under: Drafting Standards, Geometry

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