diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbc0971665..31d75a913a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -68,6 +68,16 @@
   global styles are enabled
   ([PR #877}])https://github.com/alphagov/govuk-frontend/pull/877
 
+- Define size of table in `px` rather than `em`
+
+  This brings the styling of tables inline with rest of GOV.UK Frontend which no longer uses `em` for measurements.
+
+  This change very slightly increases the padding of table cells on mobile viewport as the use of `em` meant the font size set in the table was used to calculate padding. `padding-top` and `padding-bottom` of cells increase by 1.5px respectively which very slightly increases the height of the table on mobile.
+
+  In the unlikely case that your UI has a dependency on tables being a certain fixed height of mobile viewport, this change might affect you.
+
+  ([PR #845](https://github.com/alphagov/govuk-frontend/pull/845))
+
 🏠 Internal:
 
 - Fix Design System url in package READMEs and review app
diff --git a/src/components/table/_table.scss b/src/components/table/_table.scss
index acfa89db07..e329a254bf 100644
--- a/src/components/table/_table.scss
+++ b/src/components/table/_table.scss
@@ -16,13 +16,13 @@
   .govuk-table__header {
     @include govuk-typography-weight-bold;
 
-    padding: govuk-em(govuk-spacing(2), 19px) govuk-em(govuk-spacing(4), 19px) govuk-em(govuk-spacing(2), 19px) 0;
+    padding: govuk-spacing(2) govuk-spacing(4) govuk-spacing(2) 0;
     border-bottom: 1px solid $govuk-border-colour;
     text-align: left;
   }
 
   .govuk-table__cell {
-    padding: govuk-em(govuk-spacing(2), 19px) govuk-em(govuk-spacing(4), 19px) govuk-em(govuk-spacing(2), 19px) 0;
+    padding: govuk-spacing(2) govuk-spacing(4) govuk-spacing(2) 0;
     border-bottom: 1px solid $govuk-border-colour;
     text-align: left;
   }