diff --git a/homeassistant/components/synology_dsm/const.py b/homeassistant/components/synology_dsm/const.py
index 8c17de5e997..b3c9f66c8da 100644
--- a/homeassistant/components/synology_dsm/const.py
+++ b/homeassistant/components/synology_dsm/const.py
@@ -2,6 +2,7 @@
 from homeassistant.const import (
     DATA_MEGABYTES,
     DATA_RATE_KILOBYTES_PER_SECOND,
+    DATA_TERABYTES,
     UNIT_PERCENTAGE,
 )
 
@@ -34,8 +35,8 @@ UTILISATION_SENSORS = {
 STORAGE_VOL_SENSORS = {
     "volume_status": ["Status", None, "mdi:checkbox-marked-circle-outline"],
     "volume_device_type": ["Type", None, "mdi:harddisk"],
-    "volume_size_total": ["Total Size", None, "mdi:chart-pie"],
-    "volume_size_used": ["Used Space", None, "mdi:chart-pie"],
+    "volume_size_total": ["Total Size", DATA_TERABYTES, "mdi:chart-pie"],
+    "volume_size_used": ["Used Space", DATA_TERABYTES, "mdi:chart-pie"],
     "volume_percentage_used": ["Volume Used", UNIT_PERCENTAGE, "mdi:chart-pie"],
     "volume_disk_temp_avg": ["Average Disk Temp", None, "mdi:thermometer"],
     "volume_disk_temp_max": ["Maximum Disk Temp", None, "mdi:thermometer"],
diff --git a/homeassistant/components/synology_dsm/manifest.json b/homeassistant/components/synology_dsm/manifest.json
index 4a538606ecb..f57f1843f45 100644
--- a/homeassistant/components/synology_dsm/manifest.json
+++ b/homeassistant/components/synology_dsm/manifest.json
@@ -2,7 +2,7 @@
   "domain": "synology_dsm",
   "name": "Synology DSM",
   "documentation": "https://www.home-assistant.io/integrations/synology_dsm",
-  "requirements": ["python-synology==0.7.4"],
+  "requirements": ["python-synology==0.8.0"],
   "codeowners": ["@ProtoThis", "@Quentame"],
   "config_flow": true,
   "ssdp": [
diff --git a/homeassistant/components/synology_dsm/sensor.py b/homeassistant/components/synology_dsm/sensor.py
index 6e5a486ab89..b6a88fe5a5a 100644
--- a/homeassistant/components/synology_dsm/sensor.py
+++ b/homeassistant/components/synology_dsm/sensor.py
@@ -7,11 +7,13 @@ from homeassistant.const import (
     CONF_DISKS,
     DATA_MEGABYTES,
     DATA_RATE_KILOBYTES_PER_SECOND,
+    DATA_TERABYTES,
     TEMP_CELSIUS,
 )
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity import Entity
 from homeassistant.helpers.typing import HomeAssistantType
+from homeassistant.util.temperature import celsius_to_fahrenheit
 
 from . import SynoApi
 from .const import (
@@ -63,7 +65,7 @@ async def async_setup_entry(
 
 
 class SynoNasSensor(Entity):
-    """Representation of a Synology NAS Sensor."""
+    """Representation of a Synology NAS sensor."""
 
     def __init__(
         self,
@@ -142,47 +144,51 @@ class SynoNasSensor(Entity):
 
 
 class SynoNasUtilSensor(SynoNasSensor):
-    """Representation a Synology Utilisation Sensor."""
+    """Representation a Synology Utilisation sensor."""
 
     @property
     def state(self):
         """Return the state."""
-        if self._unit == DATA_RATE_KILOBYTES_PER_SECOND or self._unit == DATA_MEGABYTES:
-            attr = getattr(self._api.utilisation, self.sensor_type)(False)
+        attr = getattr(self._api.utilisation, self.sensor_type)
+        if callable(attr):
+            attr = attr()
+        if not attr:
+            return None
 
-            if attr is None:
-                return None
+        # Data (RAM)
+        if self._unit == DATA_MEGABYTES:
+            return round(attr / 1024.0 ** 2, 1)
 
-            if self._unit == DATA_RATE_KILOBYTES_PER_SECOND:
-                return round(attr / 1024.0, 1)
-            if self._unit == DATA_MEGABYTES:
-                return round(attr / 1024.0 / 1024.0, 1)
-        else:
-            return getattr(self._api.utilisation, self.sensor_type)
+        # Network
+        if self._unit == DATA_RATE_KILOBYTES_PER_SECOND:
+            return round(attr / 1024.0, 1)
+
+        return attr
 
 
 class SynoNasStorageSensor(SynoNasSensor):
-    """Representation a Synology Storage Sensor."""
+    """Representation a Synology Storage sensor."""
 
     @property
     def state(self):
         """Return the state."""
-        if self.monitored_device:
-            if self.sensor_type in TEMP_SENSORS_KEYS:
-                attr = getattr(self._api.storage, self.sensor_type)(
-                    self.monitored_device
-                )
+        attr = getattr(self._api.storage, self.sensor_type)(self.monitored_device)
+        if not attr:
+            return None
 
-                if attr is None:
-                    return None
+        # Data (disk space)
+        if self._unit == DATA_TERABYTES:
+            return round(attr / 1024.0 ** 4, 2)
 
-                if self._api.temp_unit == TEMP_CELSIUS:
-                    return attr
+        # Temperature
+        if self._api.temp_unit == TEMP_CELSIUS:
+            # Celsius
+            return attr
+        if self.sensor_type in TEMP_SENSORS_KEYS:
+            # Fahrenheit
+            return celsius_to_fahrenheit(attr)
 
-                return round(attr * 1.8 + 32.0, 1)
-
-            return getattr(self._api.storage, self.sensor_type)(self.monitored_device)
-        return None
+        return attr
 
     @property
     def device_info(self) -> Dict[str, any]:
diff --git a/requirements_all.txt b/requirements_all.txt
index b1347e7582a..9226c01a42f 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1692,7 +1692,7 @@ python-sochain-api==0.0.2
 python-songpal==0.11.2
 
 # homeassistant.components.synology_dsm
-python-synology==0.7.4
+python-synology==0.8.0
 
 # homeassistant.components.tado
 python-tado==0.8.1
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 65433039238..fa570aedda9 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -662,7 +662,7 @@ python-miio==0.5.0.1
 python-nest==4.1.0
 
 # homeassistant.components.synology_dsm
-python-synology==0.7.4
+python-synology==0.8.0
 
 # homeassistant.components.tado
 python-tado==0.8.1