Configure Revu to be a true 1:1 ratio to paper | Revu 21

Using an older version of Revu?

Applies to:

  • Basics
  • Core
  • Complete

In this article, we’ll go over how you can calibrate Revu to ensure an onscreen PDF will match the actual size and scale of a printed drawing.

What you’ll need

  • A measuring device, such as a ruler or tape measure
  • A calculator

Calibrate the Revu display scale

This calibration is achieved by measuring the size of the Revu onscreen rulers, which allows you to calculate the current resolution of your monitor in pixels per inch (ppi) and enter it in the Resolution setting within Revu Preferences:

  1. Open any PDF in Revu.
  2. Activate the onscreen ruler by selecting View > Rulers (Ctrl+R).
  3. Set the zoom level to 100% by selecting View > Actual Size (Ctrl+8). The rulers will only be actual size at this zoom level.
  4. Use a ruler or tape measure to find the “Measured Distance” from the zero mark on the Revu ruler to another point. For example, 8 inches or 200 mm, which we’ll call the “Revu Ruler Distance.”
  5. Go to Revu > Preferences (Ctrl+K).
  6. In the Preferences dialog box, select Advanced > 2D Rendering and look for the Resolution setting near the bottom of the page.
    If this is the first time you’re performing this calibration, the default System Resolution of 96 ppi will be selected. However, if a custom calibration was previously set, the Custom option will already be enabled, with a custom Resolution value appearing in the ppi box.
  7. Select the Custom button and enter the result of the following formula in the Custom ppi field: (Revu Ruler Distance ÷ Measured Distance) x the Current Resolution PPI
(Revu Ruler Distance ÷ Measured Distance) x Current Resolution PPI = New Custom PPI
(8 in ÷ 8.25 in) x 96 = 93.09
(200 mm ÷ 216 mm) x 96 = 88.89
The custom value cannot be set lower than 50 ppi, which means calibration of some large screens isn’t possible. Below are the largest screens that can be configured, based on resolution.
  • Standard HD (1920×1080): 44 inches or 112 cm
  • WQHD or QHD (2560×1440): 58 inches or 147 cm
  • 4K or UHD (3840×2160): 88 inches or 224 cm



This article explains how you can calibrate Revu so that the onscreen PDF is the same size as it would on the printed page.


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