diff --git a/superset/assets/visualizations/big_number.js b/superset/assets/visualizations/big_number.js
index 9fe6505835..d0915a1616 100644
--- a/superset/assets/visualizations/big_number.js
+++ b/superset/assets/visualizations/big_number.js
@@ -13,20 +13,6 @@ function getNumTicks(data, slice, margin) {
   return numTicks;
 }
 
-function getMargin(valueExt, data, f) {
-  const yAxisLabelWidths = valueExt.map(value => getTextWidth(f(value), '10px Roboto'));
-  const xAxisLabelWidths = data.map(d => getTextWidth(formatDate(d[0]), '10px Roboto'));
-  const yAxisMaxWidth = Math.max(...yAxisLabelWidths);
-  const xAxisMaxWidth = Math.max(...xAxisLabelWidths);
-  let margin;
-  if (yAxisMaxWidth > xAxisMaxWidth) {
-    margin = yAxisMaxWidth + (yAxisMaxWidth / 2);
-  } else if (xAxisMaxWidth > yAxisMaxWidth) {
-    margin = xAxisMaxWidth + (xAxisMaxWidth / 2);
-  }
-  return margin;
-}
-
 function bigNumberVis(slice, payload) {
   const div = d3.select(slice.selector);
   // Define the percentage bounds that define color from red to green
@@ -62,7 +48,10 @@ function bigNumberVis(slice, payload) {
   }
   const dateExt = d3.extent(data, (d) => d[0]);
   const valueExt = d3.extent(data, (d) => d[1]);
-  const margin = getMargin(valueExt, data, f);
+  const yAxisLabelWidths = valueExt.map(value => getTextWidth(f(value), '10px Roboto'));
+  const yAxisMaxWidth = Math.max(...yAxisLabelWidths);
+  const margin = yAxisMaxWidth + (yAxisMaxWidth / 2);
+
   const scaleX = d3.time.scale.utc().domain(dateExt).range([margin, width - margin]);
   const scaleY = d3.scale.linear().domain(valueExt).range([height - (margin), margin]);
   const colorRange = [d3.hsl(0, 1, 0.3), d3.hsl(120, 1, 0.3)];