diff --git a/glances/plugins/mem/__init__.py b/glances/plugins/mem/__init__.py
index 05d89fb6..c7df6f76 100644
--- a/glances/plugins/mem/__init__.py
+++ b/glances/plugins/mem/__init__.py
@@ -173,6 +173,7 @@ class MemPlugin(GlancesPluginModel):
 
         # Manage ZFS cache (see #3979 for details)
         if self.zfs_enabled:
+            zfs_size = 0
             zfs_shrink = 0
             zfs_cache_stats = zfs_stats()
             # Uncomment the following line to use the test data
@@ -183,23 +184,27 @@ class MemPlugin(GlancesPluginModel):
                     zfs_cmin = zfs_cache_stats['arcstats.c_min']
                 else:
                     zfs_cmin = 0
-                if zfs_size > zfs_cmin:
-                    zfs_shrink = zfs_size - zfs_cmin
+
+                zfs_shrink = zfs_size - zfs_cmin
             # Add the ZFS cache to the 'cached' memory
             if 'cached' in stats:
-                stats['cached'] += zfs_shrink
+                stats['cached'] += zfs_size
             else:
-                stats['cached'] = zfs_shrink
+                stats['cached'] = zfs_size
 
-        # Use the 'free'/htop calculation
-        # free=available+buffer+cached
-        stats['free'] = stats['available']
-        if hasattr(stats, 'buffers'):
-            stats['free'] += stats['buffers']
-        if hasattr(stats, 'cached'):
-            stats['free'] += stats['cached']
-        # used=total-free
-        stats['used'] = stats['total'] - stats['free']
+            # Add the amount ZFS cache can shrink to 'available' memory
+            if 'available' in stats:
+                stats['available'] += zfs_shrink
+            else:
+                stats['available'] = zfs_shrink
+
+            # Subtract the amount ZFS cache can shrink from 'used' memory
+            stats['used'] -= zfs_shrink
+
+            # Update percent to reflect new 'available' value
+            stats['percent'] = float((stats['total'] - stats['available']) / stats['total'] * 100)
+
+        stats['used'] = stats['total'] - stats['available']
 
         return stats
 
diff --git a/glances/plugins/quicklook/__init__.py b/glances/plugins/quicklook/__init__.py
index f6152993..91ad9105 100644
--- a/glances/plugins/quicklook/__init__.py
+++ b/glances/plugins/quicklook/__init__.py
@@ -14,6 +14,7 @@ from glances.cpu_percent import cpu_percent
 from glances.logger import logger
 from glances.outputs.glances_bars import Bar
 from glances.outputs.glances_sparklines import Sparkline
+from glances.plugins.fs.zfs import zfs_enable, zfs_stats
 from glances.plugins.load import get_load_average, get_nb_log_core, get_nb_phys_core
 from glances.plugins.plugin.model import GlancesPluginModel
 
@@ -88,6 +89,9 @@ class QuicklookPlugin(GlancesPluginModel):
             args=args, config=config, items_history_list=items_history_list, fields_description=fields_description
         )
 
+        # ZFS
+        self.zfs_enabled = zfs_enable()
+
         # We want to display the stat in the curse interface
         self.display_curse = True
 
@@ -123,7 +127,14 @@ class QuicklookPlugin(GlancesPluginModel):
             stats['percpu'] = cpu_percent.get_percpu()
 
             # Get the virtual and swap memory
-            stats['mem'] = psutil.virtual_memory().percent
+            vm_stats = psutil.virtual_memory()
+            mem_total = vm_stats.total
+            mem_available = vm_stats.available
+            if self.zfs_enabled:
+                zfs_cache_stats = zfs_stats()
+                mem_available = mem_available + zfs_cache_stats.get('arcstats.size', 0) - zfs_cache_stats.get('arcstats.c_min', 0)
+
+            stats['mem'] = float((mem_total - mem_available) / mem_total * 100 )
             try:
                 stats['swap'] = psutil.swap_memory().percent
             except RuntimeError: