diff --git a/client/components/cards/attachments.jade b/client/components/cards/attachments.jade
index 84ab7eaab..88276c76f 100644
--- a/client/components/cards/attachments.jade
+++ b/client/components/cards/attachments.jade
@@ -44,6 +44,7 @@ template(name="attachmentsGalery")
             +spinner
         p.attachment-details
           = name
+          span.file-size ({{fileSize size}} KB)
           span.attachment-details-actions
             a.js-download(href="{{url download=true}}")
               i.fa.fa-download
diff --git a/client/components/cards/attachments.js b/client/components/cards/attachments.js
index bbc00c6f3..89ce1ee71 100644
--- a/client/components/cards/attachments.js
+++ b/client/components/cards/attachments.js
@@ -49,6 +49,9 @@ Template.attachmentsGalery.helpers({
   isBoardAdmin() {
     return Meteor.user().isBoardAdmin();
   },
+  fileSize(size) {
+    return Math.round(size / 1024);
+  },
 });
 
 Template.previewAttachedImagePopup.events({