diff --git a/homeassistant/components/tplink/light.py b/homeassistant/components/tplink/light.py
index 7e41d5af9e8..9910fe42e03 100644
--- a/homeassistant/components/tplink/light.py
+++ b/homeassistant/components/tplink/light.py
@@ -75,12 +75,12 @@ def add_entity(device: SmartBulb, async_add_entities):
 
 def brightness_to_percentage(byt):
     """Convert brightness from absolute 0..255 to percentage."""
-    return int((byt * 100.0) / 255.0)
+    return round((byt * 100.0) / 255.0)
 
 
 def brightness_from_percentage(percent):
     """Convert percentage to absolute value 0..255."""
-    return (percent * 255.0) / 100.0
+    return round((percent * 255.0) / 100.0)
 
 
 class LightState(NamedTuple):
diff --git a/tests/components/tplink/test_light.py b/tests/components/tplink/test_light.py
index 27d00024706..0986362ba28 100644
--- a/tests/components/tplink/test_light.py
+++ b/tests/components/tplink/test_light.py
@@ -287,7 +287,7 @@ async def test_smartswitch(
 
     state = hass.states.get("light.dimmer1")
     assert state.state == "on"
-    assert state.attributes["brightness"] == 48.45
+    assert state.attributes["brightness"] == 51
     assert sys_info["relay_state"] == 1
 
     await hass.services.async_call(
@@ -301,8 +301,8 @@ async def test_smartswitch(
 
     state = hass.states.get("light.dimmer1")
     assert state.state == "on"
-    assert state.attributes["brightness"] == 53.55
-    assert sys_info["brightness"] == 21
+    assert state.attributes["brightness"] == 56
+    assert sys_info["brightness"] == 22
 
     sys_info["relay_state"] = 0
     sys_info["brightness"] = 66
@@ -327,7 +327,7 @@ async def test_smartswitch(
 
     state = hass.states.get("light.dimmer1")
     assert state.state == "on"
-    assert state.attributes["brightness"] == 168.3
+    assert state.attributes["brightness"] == 168
     assert sys_info["brightness"] == 66
 
 
@@ -373,7 +373,7 @@ async def test_light(hass: HomeAssistant, light_mock_data: LightMockData) -> Non
 
     state = hass.states.get("light.light1")
     assert state.state == "on"
-    assert state.attributes["brightness"] == 48.45
+    assert state.attributes["brightness"] == 51
     assert state.attributes["hs_color"] == (110, 90)
     assert state.attributes["color_temp"] == 222
     assert light_state["on_off"] == 1
@@ -389,9 +389,9 @@ async def test_light(hass: HomeAssistant, light_mock_data: LightMockData) -> Non
 
     state = hass.states.get("light.light1")
     assert state.state == "on"
-    assert state.attributes["brightness"] == 53.55
+    assert state.attributes["brightness"] == 56
     assert state.attributes["hs_color"] == (23, 27)
-    assert light_state["brightness"] == 21
+    assert light_state["brightness"] == 22
     assert light_state["hue"] == 23
     assert light_state["saturation"] == 27
 
@@ -423,7 +423,7 @@ async def test_light(hass: HomeAssistant, light_mock_data: LightMockData) -> Non
 
     state = hass.states.get("light.light1")
     assert state.state == "on"
-    assert state.attributes["brightness"] == 168.3
+    assert state.attributes["brightness"] == 168
     assert state.attributes["hs_color"] == (77, 78)
     assert state.attributes["color_temp"] == 156
     assert light_state["brightness"] == 66
@@ -434,7 +434,7 @@ async def test_light(hass: HomeAssistant, light_mock_data: LightMockData) -> Non
     await update_entity(hass, "light.light1")
 
     state = hass.states.get("light.light1")
-    assert state.attributes["brightness"] == 232.05
+    assert state.attributes["brightness"] == 232
 
 
 async def test_get_light_state_retry(