diff --git a/esphome/const.py b/esphome/const.py
index 3811d5b9cf..c2074747f6 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -79,6 +79,7 @@ CONF_CO2 = 'co2'
 CONF_CODE = 'code'
 CONF_COLD_WHITE = 'cold_white'
 CONF_COLD_WHITE_COLOR_TEMPERATURE = 'cold_white_color_temperature'
+CONF_WEIGHT = 'weight'
 CONF_COLORS = 'colors'
 CONF_COLOR_CORRECT = 'color_correct'
 CONF_COLOR_TEMPERATURE = 'color_temperature'
@@ -502,6 +503,7 @@ UNIT_EMPTY = ''
 UNIT_HZ = 'hz'
 UNIT_HECTOPASCAL = 'hPa'
 UNIT_KELVIN = 'K'
+UNIT_KILOGRAMS = 'kg'
 UNIT_KILOMETER_PER_HOUR = 'km/h'
 UNIT_LUX = 'lx'
 UNIT_METER = 'm'