diff --git a/lib/cea/cea608_memory.js b/lib/cea/cea608_memory.js
index ff1e5a2e98..12ae686ab0 100644
--- a/lib/cea/cea608_memory.js
+++ b/lib/cea/cea608_memory.js
@@ -84,8 +84,10 @@ shaka.cea.Cea608Memory = class {
         startTime, endTime, /* payload= */ '');
     topLevelCue.lineInterpretation =
         shaka.text.Cue.lineInterpretation.PERCENTAGE;
-    const maxRows = shaka.cea.Cea608Memory.CC_ROWS + 1;
-    topLevelCue.line = this.row_ / maxRows * 100;
+    const line = shaka.cea.Cea608Memory.ROW_TO_LINE_CONVERSION_.get(this.row_);
+    if (line) {
+      topLevelCue.line = line;
+    }
     return shaka.cea.CeaUtils.getParsedCaption(
         topLevelCue, stream, this.rows_, startTime, endTime);
   }
@@ -320,3 +322,12 @@ shaka.cea.Cea608Memory.CharSet.ExtendedPortugueseGerman = new Map([
   [0x38, 'Å'], [0x39, 'å'], [0x3a, 'Ø'], [0x3b, 'ø'], [0x3c, '┌'], [0x3d, '┐'],
   [0x3e, '└'], [0x3f, '┘'],
 ]);
+
+/**
+ * @private @const {!Map<number, number>}
+ */
+shaka.cea.Cea608Memory.ROW_TO_LINE_CONVERSION_ = new Map([
+  [1, 10], [2, 15.33], [3, 20.66], [4, 26], [5, 31.33], [6, 36.66], [7, 42],
+  [8, 47.33], [9, 52.66], [10, 58], [11, 63.33], [12, 68.66], [13, 74],
+  [14, 79.33], [15, 84.66],
+]);
diff --git a/test/cea/cea608_memory_unit.js b/test/cea/cea608_memory_unit.js
index 208008786a..88185260fd 100644
--- a/test/cea/cea608_memory_unit.js
+++ b/test/cea/cea608_memory_unit.js
@@ -31,7 +31,7 @@ describe('Cea608Memory', () => {
     const caption = memory.forceEmit(startTime, endTime);
 
     const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-    topLevelCue.line = 6.25;
+    topLevelCue.line = 10;
     topLevelCue.lineInterpretation =
         shaka.text.Cue.lineInterpretation.PERCENTAGE;
     topLevelCue.nestedCues = [
@@ -82,7 +82,7 @@ describe('Cea608Memory', () => {
     }
 
     const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-    topLevelCue.line = 6.25;
+    topLevelCue.line = 10;
     topLevelCue.lineInterpretation =
         shaka.text.Cue.lineInterpretation.PERCENTAGE;
     topLevelCue.nestedCues = [
@@ -119,7 +119,7 @@ describe('Cea608Memory', () => {
     }
 
     const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-    topLevelCue.line = 6.25;
+    topLevelCue.line = 10;
     topLevelCue.lineInterpretation =
         shaka.text.Cue.lineInterpretation.PERCENTAGE;
     topLevelCue.nestedCues = [
@@ -173,7 +173,7 @@ describe('Cea608Memory', () => {
     // ...
     // So we expect that test\n\ntest is emitted
     const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-    topLevelCue.line = 37.5;
+    topLevelCue.line = 36.66;
     topLevelCue.lineInterpretation =
         shaka.text.Cue.lineInterpretation.PERCENTAGE;
     topLevelCue.nestedCues = [
@@ -217,7 +217,7 @@ describe('Cea608Memory', () => {
     memory.eraseChar(); // Erase the last 't' from 'testt'
 
     const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-    topLevelCue.line = 6.25;
+    topLevelCue.line = 10;
     topLevelCue.lineInterpretation =
         shaka.text.Cue.lineInterpretation.PERCENTAGE;
     topLevelCue.nestedCues = [
@@ -291,7 +291,7 @@ describe('Cea608Memory', () => {
 
       // Expected text is 's\nt\nt\ne'
       const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-      topLevelCue.line = 31.25;
+      topLevelCue.line = 31.33;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue.nestedCues = [
@@ -338,7 +338,7 @@ describe('Cea608Memory', () => {
 
       // Expected text is 't\ne\ns\nt'
       const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-      topLevelCue.line = 31.25;
+      topLevelCue.line = 31.33;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue.nestedCues = [
@@ -385,7 +385,7 @@ describe('Cea608Memory', () => {
 
       // Expected text is 't\ne\ns\nt'
       const topLevelCue = new shaka.text.Cue(startTime, endTime, '');
-      topLevelCue.line = 31.25;
+      topLevelCue.line = 31.33;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue.nestedCues = [
diff --git a/test/cea/cea_decoder_unit.js b/test/cea/cea_decoder_unit.js
index 6bd2a20e6e..4eeeff88f8 100644
--- a/test/cea/cea_decoder_unit.js
+++ b/test/cea/cea_decoder_unit.js
@@ -65,7 +65,7 @@ describe('CeaDecoder', () => {
 
       const topLevelCue = new shaka.text.Cue(
           startTimeCaption1, startTimeCaption2, '');
-      topLevelCue.line = 81.25;
+      topLevelCue.line = 74;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue.nestedCues = [
@@ -113,7 +113,7 @@ describe('CeaDecoder', () => {
       // Since there are three style changes, there should be three nested cues.
       const topLevelCue = new shaka.text.Cue(
           startTimeCaption1, startTimeCaption2, '');
-      topLevelCue.line = 6.25;
+      topLevelCue.line = 10;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
 
@@ -166,7 +166,7 @@ describe('CeaDecoder', () => {
       // A single nested cue containing yellow, italicized text.
       const topLevelCue = new shaka.text.Cue(startTimeCaption1,
           startTimeCaption2, '');
-      topLevelCue.line = 12.5;
+      topLevelCue.line = 15.33;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue.nestedCues = [
@@ -208,7 +208,7 @@ describe('CeaDecoder', () => {
 
       const topLevelCue = new shaka.text.Cue(startTimeCaption1,
           startTimeCaption2, '');
-      topLevelCue.line = 6.25;
+      topLevelCue.line = 10;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue.nestedCues = [
@@ -243,7 +243,7 @@ describe('CeaDecoder', () => {
 
       const topLevelCue = new shaka.text.Cue(startTimeCaption1,
           startTimeCaption2, '');
-      topLevelCue.line = 6.25;
+      topLevelCue.line = 10;
       topLevelCue.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue.nestedCues = [
@@ -315,7 +315,7 @@ describe('CeaDecoder', () => {
       // Top level cue corresponding to the first closed caption.
       const topLevelCue1 = new shaka.text.Cue(
           /* startTime= */ time1, /* endTime= */ time2, '');
-      topLevelCue1.line = 93.75;
+      topLevelCue1.line = 84.66;
       topLevelCue1.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue1.nestedCues = [
@@ -326,7 +326,7 @@ describe('CeaDecoder', () => {
       // Top level cue corresponding to the second closed caption.
       const topLevelCue2 = new shaka.text.Cue(
           /* startTime= */ time2, /* endTime= */ time3, '');
-      topLevelCue2.line = 93.75;
+      topLevelCue2.line = 84.66;
       topLevelCue2.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue2.nestedCues = [
@@ -343,7 +343,7 @@ describe('CeaDecoder', () => {
       // Top level cue corresponding to the third closed caption.
       const topLevelCue3 = new shaka.text.Cue(
           /* startTime= */ time3, /* endTime= */ time4, '');
-      topLevelCue3.line = 93.75;
+      topLevelCue3.line = 84.66;
       topLevelCue3.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue3.nestedCues = [
@@ -360,7 +360,7 @@ describe('CeaDecoder', () => {
       // Top level cue corresponding to the fourth closed caption.
       const topLevelCue4 = new shaka.text.Cue(
           /* startTime= */ time4, /* endTime= */ time5, '');
-      topLevelCue4.line = 93.75;
+      topLevelCue4.line = 84.66;
       topLevelCue4.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue4.nestedCues = [
@@ -433,7 +433,7 @@ describe('CeaDecoder', () => {
       // Top level cue corresponding to the first closed caption.
       const topLevelCue1 = new shaka.text.Cue(/* startTime= */ 1,
           /* endTime= */ 2, '');
-      topLevelCue1.line = 93.75;
+      topLevelCue1.line = 84.66;
       topLevelCue1.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue1.nestedCues = [
@@ -444,7 +444,7 @@ describe('CeaDecoder', () => {
       // Top level cue corresponding to the second closed caption.
       const topLevelCue2 = new shaka.text.Cue(/* startTime= */ 2,
           /* endTime= */ 3, '');
-      topLevelCue2.line = 25;
+      topLevelCue2.line = 26;
       topLevelCue2.lineInterpretation =
           shaka.text.Cue.lineInterpretation.PERCENTAGE;
       topLevelCue2.nestedCues = [