diff --git a/st.c b/st.c
index 2811876..8b92289 100644
--- a/st.c
+++ b/st.c
@@ -2715,6 +2715,7 @@ xloadfonts(char *fontstr, int fontsize) {
 	FcPattern *pattern;
 	FcResult result;
 	double fontval;
+	double DPI;
 
 	if(fontstr[0] == '-') {
 		pattern = XftXlfdParse(fontstr, False, False);
@@ -2734,12 +2735,21 @@ xloadfonts(char *fontstr, int fontsize) {
 		if(result == FcResultMatch) {
 			usedfontsize = (int)fontval;
 		} else {
-			/*
-			 * Default font size is 12, if none given. This is to
-			 * have a known usedfontsize value.
-			 */
-			FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
-			usedfontsize = 12;
+			/* Try to get size in Pt */
+			result = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
+			if(result == FcResultMatch) {
+				DPI = XDisplayWidth(xw.dpy, xw.scr) /
+					(XDisplayWidthMM(xw.dpy, xw.scr) / 25.4);
+				usedfontsize = (int)DPI * fontval / 72;
+				FcPatternAddDouble(pattern, FC_PIXEL_SIZE, usedfontsize);
+			} else {
+				/*
+				 * Default font size is 12, if none given. This
+				 * is to have a known usedfontsize value.
+				 */
+				FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
+				usedfontsize = 12;
+			}
 		}
 	}