diff --git a/packages/virtualized-lists/Lists/ListMetricsAggregator.js b/packages/virtualized-lists/Lists/ListMetricsAggregator.js
index a7972390211f17..9516269aee024e 100644
--- a/packages/virtualized-lists/Lists/ListMetricsAggregator.js
+++ b/packages/virtualized-lists/Lists/ListMetricsAggregator.js
@@ -167,6 +167,30 @@ export default class ListMetricsAggregator {
       // check for invalid frames due to row re-ordering
       return frame;
     } else {
+      let offset;
+
+      const highestMeasuredCellIndex = this.getHighestMeasuredCellIndex();
+      if (highestMeasuredCellIndex < index) {
+        // If any of the cells before this one have been laid out already, we
+        // should use that information in the estimations.
+        // This is important because if the list has a header, the initial cell
+        // will have a larger offset that we should take into account here.
+        const highestMeasuredCellFrame = this.getCellMetrics(
+          highestMeasuredCellIndex,
+          props,
+        );
+        if (highestMeasuredCellFrame) {
+          offset =
+            highestMeasuredCellFrame.offset +
+            highestMeasuredCellFrame.length +
+            this._averageCellLength * (index - highestMeasuredCellIndex - 1);
+        }
+      }
+
+      if (offset == null) {
+        offset = this._averageCellLength * index;
+      }
+
       const {data, getItemCount} = props;
       invariant(
         index >= 0 && index < getItemCount(data),
@@ -174,7 +198,7 @@ export default class ListMetricsAggregator {
       );
       return {
         length: this._averageCellLength,
-        offset: this._averageCellLength * index,
+        offset,
         index,
         isMounted: false,
       };
diff --git a/packages/virtualized-lists/Lists/__tests__/ListMetricsAggregator-test.js b/packages/virtualized-lists/Lists/__tests__/ListMetricsAggregator-test.js
index 2278ca9e50cbff..7b5e416d41960e 100644
--- a/packages/virtualized-lists/Lists/__tests__/ListMetricsAggregator-test.js
+++ b/packages/virtualized-lists/Lists/__tests__/ListMetricsAggregator-test.js
@@ -221,7 +221,7 @@ describe('ListMetricsAggregator', () => {
         height: 10,
         width: 5,
         x: 0,
-        y: 0,
+        y: 100,
       },
     });
 
@@ -233,7 +233,7 @@ describe('ListMetricsAggregator', () => {
         height: 20,
         width: 5,
         x: 0,
-        y: 10,
+        y: 110,
       },
     });
 
@@ -241,7 +241,7 @@ describe('ListMetricsAggregator', () => {
     expect(listMetrics.getCellMetricsApprox(2, props)).toEqual({
       index: 2,
       length: 15,
-      offset: 30,
+      offset: 130,
       isMounted: false,
     });
   });
@@ -481,7 +481,7 @@ describe('ListMetricsAggregator', () => {
 
   it('estimates RTL metrics of unmeasured cell', () => {
     const listMetrics = new ListMetricsAggregator();
-    const orientation = {horizontal: true, rtl: false};
+    const orientation = {horizontal: true, rtl: true};
     const props: CellMetricProps = {
       data: [1, 2, 3, 4, 5],
       getItemCount: () => nullthrows(props.data).length,
@@ -500,7 +500,7 @@ describe('ListMetricsAggregator', () => {
       layout: {
         height: 5,
         width: 10,
-        x: 90,
+        x: 70,
         y: 0,
       },
     });
@@ -512,23 +512,22 @@ describe('ListMetricsAggregator', () => {
       layout: {
         height: 5,
         width: 20,
-        x: 70,
+        x: 50,
         y: 0,
       },
     });
 
-    expect(listMetrics.getCellMetrics(2, props)).toBeNull();
     expect(listMetrics.getCellMetricsApprox(2, props)).toEqual({
       index: 2,
       length: 15,
-      offset: 30,
+      offset: 50,
       isMounted: false,
     });
   });
 
   it('uses getItemLayout for RTL metrics of unmeasured cell', () => {
     const listMetrics = new ListMetricsAggregator();
-    const orientation = {horizontal: true, rtl: false};
+    const orientation = {horizontal: true, rtl: true};
     const props: CellMetricProps = {
       data: [1, 2, 3, 4, 5],
       getItemCount: () => nullthrows(props.data).length,