diff --git a/lib/monero/get_height_by_date.dart b/lib/monero/get_height_by_date.dart
index 3f5f87623..5393d2a32 100644
--- a/lib/monero/get_height_by_date.dart
+++ b/lib/monero/get_height_by_date.dart
@@ -85,34 +85,29 @@ final dates = {
   "2020-11": 2221803
 };
 
+final heightCoefficient = 0.7;
+
 int getHeigthByDate({DateTime date}) {
   final raw = '${date.year}' + '-' + '${date.month}';
-  var endHeight = dates[raw] ?? 0;
-  int preLastYear = date.year;
-  int preLastMonth = date.month - 1;
+  final lastHeight = dates.values.last;
+  int startHeight;
+  int endHeight;
+  int height;
 
-  if (endHeight <= 0) {
+  if ((dates[raw] == null)||(dates[raw] == lastHeight)) {
+    startHeight = dates.values.toList()[dates.length - 2];
     endHeight = dates.values.toList()[dates.length - 1];
-    final preLastDate =
-        dateFormat.parse(dates.keys.elementAt(dates.keys.length - 2));
-    preLastYear = preLastDate.year;
-    preLastMonth = preLastDate.month;
+    final heightPerDay = (endHeight - startHeight) / 31;
+    final daysHeight = (heightCoefficient * date.day * heightPerDay).round();
+    height = endHeight + daysHeight;
   } else {
-    preLastYear = date.year;
-    preLastMonth = date.month - 1;
+    startHeight = dates[raw];
+    final index = dates.values.toList().indexOf(startHeight);
+    endHeight = dates.values.toList()[index + 1];
+    final heightPerDay = (endHeight - startHeight) / 31;
+    final daysHeight = date.day * heightPerDay.round();
+    height = startHeight + daysHeight;
   }
 
-  if (preLastMonth <= 0) {
-    preLastMonth = 12;
-    preLastYear -= 1;
-  }
-
-  final startRaw = '$preLastYear' + '-' + '$preLastMonth';
-  final startHeight = dates[startRaw];
-  final diff = endHeight - startHeight;
-  final heightPerDay = diff / 30;
-  final daysHeight = date.day * heightPerDay.round();
-  final height = endHeight + daysHeight;
-
   return height;
 }
diff --git a/lib/src/widgets/blockchain_height_widget.dart b/lib/src/widgets/blockchain_height_widget.dart
index 384700839..f8b22b5c4 100644
--- a/lib/src/widgets/blockchain_height_widget.dart
+++ b/lib/src/widgets/blockchain_height_widget.dart
@@ -92,7 +92,7 @@ class BlockchainHeightState extends State<BlockchainHeightWidget> {
     final date = await getDate(
         context: context,
         initialDate: now.subtract(Duration(days: 1)),
-        firstDate: DateTime(2014, DateTime.april),
+        firstDate: DateTime(2014, DateTime.may),
         lastDate: now);
 
     if (date != null) {