diff --git a/esphome/const.py b/esphome/const.py
index 8c8a1c7102..e6ce4a6ba2 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -679,6 +679,7 @@ ICON_WIFI = "mdi:wifi"
 UNIT_AMPERE = "A"
 UNIT_CELSIUS = "°C"
 UNIT_COUNTS_PER_CUBIC_METER = "#/m³"
+UNIT_CUBIC_METER = "m³"
 UNIT_DECIBEL = "dB"
 UNIT_DECIBEL_MILLIWATT = "dBm"
 UNIT_DEGREE_PER_SECOND = "°/s"