Setting composer layout units to inches in QGIS

Question

I open a new composer and select ANSI A for my paper. The notation after the name is “Letter; 8.5inx11in”, but the width and height are displayed in mm, and the units selection is grayed out, so I can’t change it. The rulers at the top and left of the layout are in mm, and the parameters for “Snap to grid” are also in mm. If I then select “Custom”, I can select inches for units, and the Width and Height display as 8.5 and 11. However the rulers in the layout are still in mm, as are the units for the grid.

Can the entire composer project be converted to inches?

qgis 2.01 64 bit
windows 7, 64 bit

print composer qgis units

Can the entire composer project be converted to inches?

qgis 2.01 64 bit
windows 7, 64 bit

Balala · Answer

It looks like this problem is fixed in QGIS 2.8.1 :

Are you able to reproduce this?

ndawson · Answer

You can't (as of 2.12). The "units" selection in the composition properties tab only changes the units for the display page size. Everything else is hardcoded to use mm (ie rulers, item positions, item sizes, etc).

Answered by ndawson on January 2, 2021

ndawson · Answer

This is possible in QGIS >= 3.0.

bkepl · Answer

You can set the ruler in inches (See Setup QGIS Print Layout to use Inch Instead of Millimeter), but this has the effect of modifying every feature and label in that layout to use inches as it's base unit instead of millimeters, but they keep the value set, so a line set to .1 mm becomes .1 in; if I have a line width defined in inches, the width in the layout becomes x"*25.4, the conversion factor between inches and millimeters, so a line I've set to .01" becomes .254". It's the same with points or pixels: whatever I set in the map becomes 24.5x larger.
Is there something that can be set to modify this behavior?
I should add that I'm using v3.1416.
Bruce

Setting composer layout units to inches in QGIS

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