From 55c98d2e3342147069053c7e53240ef6877edd7b Mon Sep 17 00:00:00 2001
From: Geoff Appleby <geoff@gapple.ca>
Date: Wed, 15 Oct 2025 15:53:16 -0700
Subject: [PATCH] round_to_sigfig filter documentation

---
 content/components/sensor/_index.md           |  4 ++++
 .../sensor/filter/round_to_sigfig.md          | 20 +++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 content/components/sensor/filter/round_to_sigfig.md

diff --git a/content/components/sensor/_index.md b/content/components/sensor/_index.md
index 6bd95c6455..06a3799448 100644
--- a/content/components/sensor/_index.md
+++ b/content/components/sensor/_index.md
@@ -255,6 +255,10 @@ filters:
 
 {{< include "filter/round_to_multiple_of.md" >}}
 
+### `round_to_sigfig`
+
+{{< include "filter/round_to_sigfig.md" >}}
+
 ### `skip_initial`
 
 {{< include "filter/skip_initial.md" >}}
diff --git a/content/components/sensor/filter/round_to_sigfig.md b/content/components/sensor/filter/round_to_sigfig.md
new file mode 100644
index 0000000000..a513535d2e
--- /dev/null
+++ b/content/components/sensor/filter/round_to_sigfig.md
@@ -0,0 +1,20 @@
+---
+description: ""
+headless: true
+---
+
+Rounds the value to the specified number of significant figures. Takes an integer greater than zero.
+
+```yaml
+- platform: ...
+  filters:
+    - round_to_sigfig: 2
+    # 3.14159 -> 3.1
+    # 157079 -> 160000
+
+- platform: ...
+  filters:
+    - round_to_sigfig: 4
+    # 3.14159 -> 3.142
+    # 157079 -> 157100
+```