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Calibrate the scale from a known length

No scale you trust? Measure something you know.

  • How-to
  • 1 min
  • Free and Pro
  • Checked with Fluah 1.0.34

Where to find it

SCALECalibrate

Steps

  1. Click SCALE on the status bar, then Calibrate.

    The scale panel: Calibrate marked

  2. Click both ends of a known length, like the scale bar's 0 and 10.

    The drawing's scale bar, its 0 and 10 m ends marked

  3. Type the real length, pick mm or m, then Apply.

    Calibrate: PAPER 100.00 mm, KNOWN 10 m, SCALE 1:100, Apply marked
    Tip. All pages calibrates every sheet at once.

  4. CAL shows the page is calibrated. Clear in the scale panel takes it off.

    SCALE 1:100 CAL on the status bar
    Calibrated, 10 m = 100.00 mm, with Clear marked
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Updated 6 November 2026