Lines not plotting to correct length

[RickF]

I'm using quad pro v3.21.3 for mac trying to get lines to plot to the length I specify. I tried a vertical line, added the length of 30'-9". When I measure or dimension the line they read 29'-3"

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Any lines drawn do the same except 2 point that get dragged to the wanted length.
Drawing units and paper units are both set to inch
dimensions are set to architectural precision 0'-0 1/4"

I need to use the architectural dimensions for a drawing to be used for building permits so I haven't done a drawing yet as I need it to be correct first.

[andrew]

QCAD allows you to enter mathematical expressions wherever numerical values can be entered (here the length field).

Unfortunately, this means that you cannot enter feet and inches as 30'-9" as this is interpreted as 30' minus 9" (= 29'3"). Instead, you can enter 30'9" (or 30'+9").

[RickF]

Thanks, that works. I was just following what was displayed.