diff --git a/src/calibre/library/caches.py b/src/calibre/library/caches.py
index 06cf07bb67..d68c81931f 100644
--- a/src/calibre/library/caches.py
+++ b/src/calibre/library/caches.py
@@ -341,8 +341,13 @@ class ResultCache(SearchQueryParser):
             cast = lambda x : float (x)
             adjust = lambda x: x
 
+        if len(query) > 1:
+            mult = query[-1:].lower()
+            if mult in ['k', 'm', 'g']:
+                query = query[:-1]
+                mult = {'k':1024., 'm': 1024.*1024, 'g': 1024.*1024*1024}[mult]
         try:
-            q = cast(query)
+            q = cast(query) * mult
         except:
             return matches
 
diff --git a/src/calibre/library/field_metadata.py b/src/calibre/library/field_metadata.py
index 5ccc17d1eb..626683fee5 100644
--- a/src/calibre/library/field_metadata.py
+++ b/src/calibre/library/field_metadata.py
@@ -253,7 +253,7 @@ class FieldMetadata(dict):
                            'is_multiple':None,
                            'kind':'field',
                            'name':None,
-                           'search_terms':[],
+                           'search_terms':['size'],
                            'is_custom':False,
                            'is_category':False}),
             ('timestamp', {'table':None,