From f50d5d79a43e2cfb2b84dc57f6017ce70f7ee568 Mon Sep 17 00:00:00 2001
From: Petar Petrov <MindFreeze@users.noreply.github.com>
Date: Sun, 22 Jun 2025 13:11:29 +0300
Subject: [PATCH] Another fix for history chart axis rounding (#25852)

---
 .../chart/state-history-chart-line.ts         | 25 ++++++++-----------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/src/components/chart/state-history-chart-line.ts b/src/components/chart/state-history-chart-line.ts
index f8f7689539..10ba4dcb50 100644
--- a/src/components/chart/state-history-chart-line.ts
+++ b/src/components/chart/state-history-chart-line.ts
@@ -729,20 +729,17 @@ export class StateHistoryChartLine extends LitElement {
   }
 
   private _formatYAxisLabel = (value: number) => {
-    const formatOptions =
-      value >= 1 || value <= -1
-        ? undefined
-        : {
-            // show the first significant digit for tiny values
-            maximumFractionDigits: Math.max(
-              2,
-              // use the difference to the previous value to determine the number of significant digits #25526
-              -Math.floor(
-                Math.log10(Math.abs(value - this._previousYAxisLabelValue || 1))
-              )
-            ),
-          };
-    const label = formatNumber(value, this.hass.locale, formatOptions);
+    // show the first significant digit for tiny values
+    const maximumFractionDigits = Math.max(
+      1,
+      // use the difference to the previous value to determine the number of significant digits #25526
+      -Math.floor(
+        Math.log10(Math.abs(value - this._previousYAxisLabelValue || 1))
+      )
+    );
+    const label = formatNumber(value, this.hass.locale, {
+      maximumFractionDigits,
+    });
     const width = measureTextWidth(label, 12) + 5;
     if (width > this._yWidth) {
       this._yWidth = width;