diff --git a/app/src/main/java/eu/faircode/email/HtmlHelper.java b/app/src/main/java/eu/faircode/email/HtmlHelper.java
index 285f8fa934..380a460f64 100644
--- a/app/src/main/java/eu/faircode/email/HtmlHelper.java
+++ b/app/src/main/java/eu/faircode/email/HtmlHelper.java
@@ -1375,9 +1375,11 @@ public class HtmlHelper {
             if (value.endsWith("pc")) // 6 pc = 72 pt
                 return Float.parseFloat(value.substring(0, value.length() - 2).trim()) / 12 / DEFAULT_FONT_SIZE_PT;
             if (value.endsWith("cm")) // 1 inch = 2.54 cm
-                return Float.parseFloat(value.substring(0, value.length() - 2).trim()) / 2.54f / 72 / DEFAULT_FONT_SIZE_PT;
+                return Float.parseFloat(value.substring(0, value.length() - 2).trim()) / 2.54f * 72 / DEFAULT_FONT_SIZE_PT;
+            if (value.endsWith("mm")) // 1 inch = 25.4 mm
+                return Float.parseFloat(value.substring(0, value.length() - 2).trim()) / 25.4f * 72 / DEFAULT_FONT_SIZE_PT;
             if (value.endsWith("in")) // 1 inch = 72pt
-                return Float.parseFloat(value.substring(0, value.length() - 2).trim()) / 72 / DEFAULT_FONT_SIZE_PT;
+                return Float.parseFloat(value.substring(0, value.length() - 2).trim()) * 72 / DEFAULT_FONT_SIZE_PT;
             return Float.parseFloat(value.trim()) / DEFAULT_FONT_SIZE;
         } catch (NumberFormatException ex) {
             Log.i(ex);