<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">I've created a shape file, geometry is polygon, I have the CRS set as what the project is set at.</div><div dir="ltr" data-setdir="false">I open the field calculator-Create a new field "Acres" - set the Output field type to "Decimal number (real) - output field length to 5 and precision to 2 - using the Geometry- expression: $area to calculate the acres it gives me "nan" for the preview. No acres.</div><div dir="ltr" data-setdir="false">I've been able to create a new field and calculate acres and length (ft) with no problem. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I'm running qgis 3.34.7</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Marc Bordelon</div><div dir="ltr" data-setdir="false">marcbordelon@yahoo.com</div></div></body></html>