diff --git a/src/calibre/utils/fonts/sfnt/merge.py b/src/calibre/utils/fonts/sfnt/merge.py
index 01ed837938..49526d86d3 100644
--- a/src/calibre/utils/fonts/sfnt/merge.py
+++ b/src/calibre/utils/fonts/sfnt/merge.py
@@ -12,25 +12,51 @@ class GlyphSizeMismatch(ValueError):
 
 
 def merge_truetype_fonts_for_pdf(fonts, log=None):
-    # only merges the glyf and loca tables, ignoring all other tables
     all_glyphs = {}
     ans = fonts[0]
+    hmetrics_map = {}
+    vmetrics_map = {}
 
     for font in fonts:
         loca = font[b'loca']
         glyf = font[b'glyf']
+        num_glyphs = font[b'maxp'].num_glyphs
         loca.load_offsets(font[b'head'], font[b'maxp'])
+        try:
+            hhea = font[b'hhea']
+        except KeyError:
+            hhea = None
+        else:
+            hhea.read_data(font[b'hmtx'], num_glyphs)
+        try:
+            vhea = font[b'vhea']
+        except KeyError:
+            vhea = None
+        else:
+            vhea.read_data(font[b'vmtx'], num_glyphs)
+
         for glyph_id in range(len(loca.offset_map) - 1):
             offset, sz = loca.glyph_location(glyph_id)
-            if sz > 0:
-                prev_glyph_data = all_glyphs.get(glyph_id)
-                if prev_glyph_data is None:
-                    all_glyphs[glyph_id] = glyf.glyph_data(offset, sz, as_raw=True)
-                else:
-                    if abs(sz - len(prev_glyph_data)) > 8:
-                        # raise Exception('Size mismatch for glyph id: {} prev_sz: {} sz: {}'.format(glyph_id, len(prev_glyph_data), sz))
-                        if log is not None:
-                            log('Size mismatch for glyph id: {} prev_sz: {} sz: {}'.format(glyph_id, len(prev_glyph_data), sz))
+            prev_glyph_data = all_glyphs.get(glyph_id)
+            if not prev_glyph_data:
+                all_glyphs[glyph_id] = glyf.glyph_data(offset, sz, as_raw=True)
+                if hhea is not None:
+                    hmetrics_map[glyph_id] = hhea.metrics_for(glyph_id)
+                if vhea is not None:
+                    vmetrics_map[glyph_id] = vhea.metrics_for(glyph_id)
+            elif sz > 0:
+                if abs(sz - len(prev_glyph_data)) > 8:
+                    # raise Exception('Size mismatch for glyph id: {} prev_sz: {} sz: {}'.format(glyph_id, len(prev_glyph_data), sz))
+                    if log is not None:
+                        log('Size mismatch for glyph id: {} prev_sz: {} sz: {}'.format(glyph_id, len(prev_glyph_data), sz))
+                if hhea is not None:
+                    m = hhea.metrics_for(glyph_id)
+                    if m != hmetrics_map[glyph_id]:
+                        log(f'Metrics mismatch for glyph id: {glyph_id} prev: {hmetrics_map[glyph_id]} cur: {m}')
+                if vhea is not None:
+                    m = vhea.metrics_for(glyph_id)
+                    if m != vmetrics_map[glyph_id]:
+                        log(f'Metrics mismatch for glyph id: {glyph_id} prev: {vmetrics_map[glyph_id]} cur: {m}')
 
     glyf = ans[b'glyf']
     head = ans[b'head']
@@ -46,4 +72,11 @@ def merge_truetype_fonts_for_pdf(fonts, log=None):
     head.update()
     maxp.num_glyphs = len(loca.offset_map) - 1
     maxp.update()
+    if hmetrics_map:
+        ans[b'hhea'].update(hmetrics_map, ans[b'hmtx'])
+    if vmetrics_map:
+        ans[b'vhea'].update(vmetrics_map, ans[b'vmtx'])
+
+    for name in 'hdmx GPOS GSUB'.split():
+        ans.pop(name.encode('ascii'), None)
     return ans