diff --git a/src/page.h b/src/page.h
index b79eac2..24a42dc 100644
--- a/src/page.h
+++ b/src/page.h
@@ -679,6 +679,10 @@ namespace xmreg
 
             } // while (i <= end_height)
 
+            // calculate median size of the blocks shown
+            double blk_size_median = xmreg::calc_median(blk_sizes.begin(), blk_sizes.end());
+
+            context["blk_size_median"] = fmt::format("{:0.2f}", blk_size_median);
 
             // save computational times for disply in the frontend
 
diff --git a/src/templates/index2.html b/src/templates/index2.html
index ae7f4cf..c1fd991 100644
--- a/src/templates/index2.html
+++ b/src/templates/index2.html
@@ -64,8 +64,7 @@
       <h2 style="margin-bottom: 0px">Transactions in older blocks<!--(height: {{height}})--></h2>
     {{/is_page_zero}}
 
-
-
+    <h4 style="font-size: 14px; margin-top: 0px">(Median size of these blocks: {{blk_size_median}} kB)</h4>
 
     <div class="center">