diff --git a/src/calibre/gui2/dialogs/trim_image.py b/src/calibre/gui2/dialogs/trim_image.py
index e7e0869fe5..764beb3a5e 100644
--- a/src/calibre/gui2/dialogs/trim_image.py
+++ b/src/calibre/gui2/dialogs/trim_image.py
@@ -83,10 +83,9 @@ class TrimImage(QDialog):
 
     def selection_area_changed(self, rect):
         if rect:
-            w = rect.width()
-            h = rect.height()
+            x, y, w, h = map(int, self.canvas.rect_for_trim())
             text = f'{int(w)}x{int(h)}'
-            text = _('Size: {0}px Aspect ratio: {1:.2g}').format(text, w / h)
+            text = _('Size: {0}px Aspect ratio: {1:.3g}').format(text, w / h)
         else:
             text = ''
         self.tr_sz.setText(text)
diff --git a/src/calibre/gui2/tweak_book/editor/canvas.py b/src/calibre/gui2/tweak_book/editor/canvas.py
index 15dffe8421..99543622ec 100644
--- a/src/calibre/gui2/tweak_book/editor/canvas.py
+++ b/src/calibre/gui2/tweak_book/editor/canvas.py
@@ -93,10 +93,7 @@ class Trim(Command):
     TEXT = _('Trim image')
 
     def __call__(self, canvas):
-        img = canvas.current_image
-        target = canvas.target
-        sr = canvas.selection_state.rect
-        return img.copy(*map(int, get_selection_rect(img, sr, target)))
+        return canvas.current_image.copy(*map(int, canvas.rect_for_trim()))
 
 
 class AutoTrim(Trim):
@@ -502,6 +499,12 @@ class Canvas(QWidget):
                 if edge is not None:
                     self.move_edge(edge, dp)
 
+    def rect_for_trim(self):
+        img = self.current_image
+        target = self.target
+        sr = self.selection_state.rect
+        return get_selection_rect(img, sr, target)
+
     def mousePressEvent(self, ev):
         if ev.button() == Qt.MouseButton.LeftButton and self.target.contains(ev.pos()):
             pos = ev.pos()