diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index d59796688d0..406cac28a3a 100755
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -295,6 +295,8 @@
     <dimen name="storage_summary_padding_end">16dp</dimen>
     <!-- Text size of the big number in the donut. -->
     <dimen name="storage_donut_view_percent_text_size">30sp</dimen>
+    <!-- Text size of the percentage sign in the donut. -->
+    <dimen name="storage_donut_view_percent_sign_size">20sp</dimen>
     <!-- Text size of the label text in the donut. -->
     <dimen name="storage_donut_view_label_text_size">14sp</dimen>
     <!-- Text size of the label text in the donut if the label text is long. -->
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 2d530ee09cf..5baeffd58af 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -9620,7 +9620,7 @@
     <string name="storage_files">Files</string>
 
     <!-- Summary of a single storage volume used space. [CHAR LIMIT=24] -->
-    <string name="storage_size_large_alternate"><xliff:g id="number" example="128">^1</xliff:g><small> <xliff:g id="unit" example="KB">^2</xliff:g></small></string>
+    <string name="storage_size_large_alternate"><xliff:g id="number" example="128">^1</xliff:g><small> <font size="20"><xliff:g id="unit" example="KB">^2</xliff:g></font></small></string>
     <!-- Summary of a single storage volume total space. [CHAR LIMIT=48]-->
     <string name="storage_volume_total">Used of <xliff:g id="total" example="32GB">%1$s</xliff:g></string>
     <!-- Follows the percent of storage used by a storage volume. Exposed inside of a donut graph. [CHAR LIMIT=7]-->
diff --git a/src/com/android/settings/widget/DonutView.java b/src/com/android/settings/widget/DonutView.java
index 330249b28a4..4fb3c5b2464 100644
--- a/src/com/android/settings/widget/DonutView.java
+++ b/src/com/android/settings/widget/DonutView.java
@@ -24,9 +24,16 @@ import android.graphics.Paint;
 import android.graphics.PorterDuff;
 import android.graphics.PorterDuffColorFilter;
 import android.graphics.Typeface;
+import android.icu.text.DecimalFormatSymbols;
 import android.support.annotation.ColorRes;
+import android.text.Layout;
+import android.text.Spannable;
+import android.text.SpannableString;
+import android.text.Spanned;
+import android.text.StaticLayout;
 import android.text.TextPaint;
 import android.text.TextUtils;
+import android.text.style.RelativeSizeSpan;
 import android.util.AttributeSet;
 import android.view.View;
 
@@ -124,7 +131,6 @@ public class DonutView extends View {
         mBigNumberPaint.setAntiAlias(true);
         mBigNumberPaint.setTextSize(
                 resources.getDimension(R.dimen.storage_donut_view_percent_text_size));
-        mBigNumberPaint.setTextAlign(Paint.Align.CENTER);
         mBigNumberPaint.setTypeface(Typeface.create(
                 context.getString(com.android.internal.R.string.config_headlineFontFamily),
                 Typeface.NORMAL));
@@ -167,11 +173,25 @@ public class DonutView extends View {
         final float centerY = getHeight() / 2;
         final float totalHeight = getTextHeight(mTextPaint) + getTextHeight(mBigNumberPaint);
         final float startY = centerY + totalHeight / 2;
+        final float fontProportion = getResources().getDimension(
+                R.dimen.storage_donut_view_percent_sign_size) /
+                getResources().getDimension(R.dimen.storage_donut_view_percent_text_size);
+        // Support from Android P
+        final String localizedPercentSign = new DecimalFormatSymbols().getPercentString();
+        final int startIndex = mPercentString.indexOf(localizedPercentSign);
+        final int endIndex = startIndex + localizedPercentSign.length();
+
+        // The first line y-coordinates start at (total height - all TextPaint height) / 2
+        canvas.save();
+        final Spannable percentStringSpan = new SpannableString(mPercentString);
+        percentStringSpan.setSpan(new RelativeSizeSpan(fontProportion),
+                startIndex, endIndex, Spanned.SPAN_INCLUSIVE_INCLUSIVE);
+        final StaticLayout percentStringLayout = new StaticLayout(percentStringSpan,
+                mBigNumberPaint, getWidth(), Layout.Alignment.ALIGN_CENTER, 1, 0, false);
+        canvas.translate(0, (getHeight() - totalHeight) / 2);
+        percentStringLayout.draw(canvas);
+        canvas.restore();
 
-        // The first line is the height of the bottom text + its descender above the bottom line.
-        canvas.drawText(mPercentString, centerX,
-                startY - getTextHeight(mTextPaint) - mBigNumberPaint.descent(),
-                mBigNumberPaint);
         // The second line starts at the bottom + room for the descender.
         canvas.drawText(mFullString, centerX, startY - mTextPaint.descent(), mTextPaint);
     }