diff --git a/bindings/SigarWrapper.pm b/bindings/SigarWrapper.pm
index 52519a70..0cf2bbe3 100644
--- a/bindings/SigarWrapper.pm
+++ b/bindings/SigarWrapper.pm
@@ -312,6 +312,34 @@ our %classes = (
              Win32   => 'taskman',
          },
       },
+      {
+         name => 'used_percent', type => 'Double',
+         desc => 'Percent total used system memory',
+         plat => '*',
+         cmd  => {
+             AIX     => '',
+             Darwin  => '',
+             FreeBSD => '',
+             HPUX    => '',
+             Linux   => 'free',
+             Solaris => '',
+             Win32   => 'taskman',
+         },
+      },
+      {
+         name => 'free_percent', type => 'Double',
+         desc => 'Percent total free system memory',
+         plat => '*',
+         cmd  => {
+             AIX     => '',
+             Darwin  => '',
+             FreeBSD => '',
+             HPUX    => '',
+             Linux   => 'free',
+             Solaris => '',
+             Win32   => 'taskman',
+         },
+      },
     ],
     Swap => [
       {
diff --git a/bindings/java/src/org/hyperic/sigar/test/TestMem.java b/bindings/java/src/org/hyperic/sigar/test/TestMem.java
index 5c8e00ac..cdaf4f00 100644
--- a/bindings/java/src/org/hyperic/sigar/test/TestMem.java
+++ b/bindings/java/src/org/hyperic/sigar/test/TestMem.java
@@ -36,6 +36,10 @@ public class TestMem extends SigarTestCase {
 
         assertGtZeroTrace("Used", mem.getUsed());
 
+        traceln("UsedPercent=" + mem.getUsedPercent());
+
+        traceln("FreePercent=" + mem.getFreePercent());
+
         assertGtZeroTrace("Free", mem.getFree());
 
         assertGtZeroTrace("ActualUsed", mem.getUsed());
diff --git a/include/sigar.h b/include/sigar.h
index 10b18da6..908827ee 100644
--- a/include/sigar.h
+++ b/include/sigar.h
@@ -141,6 +141,8 @@ typedef struct {
         free,
         actual_used,
         actual_free;
+    double used_percent;
+    double free_percent;
 } sigar_mem_t;
 
 SIGAR_DECLARE(int) sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem);
diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index 56f52738..d4ef8786 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -457,11 +457,11 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
 
     mem->used = mem->total - mem->free;
 
-    sigar_mem_calc_ram(sigar, mem);
-
     mem->actual_free = mem->free;
     mem->actual_used = mem->used;
 
+    sigar_mem_calc_ram(sigar, mem);
+
     return SIGAR_OK;
 }
 
diff --git a/src/os/hpux/hpux_sigar.c b/src/os/hpux/hpux_sigar.c
index 6d7af50a..553e73de 100644
--- a/src/os/hpux/hpux_sigar.c
+++ b/src/os/hpux/hpux_sigar.c
@@ -79,8 +79,6 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
 
     mem->total = sigar->pstatic.physical_memory * pagesize;
 
-    sigar_mem_calc_ram(sigar, mem);
-
     pstat_getdynamic(&stats, sizeof(stats), 1, 0);
 
     mem->free = stats.psd_free * pagesize;
@@ -88,7 +86,9 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
 
     mem->actual_free = mem->free;
     mem->actual_used = mem->used;
-    
+
+    sigar_mem_calc_ram(sigar, mem);
+
     return SIGAR_OK;
 }
 
diff --git a/src/os/linux/linux_sigar.c b/src/os/linux/linux_sigar.c
index d5c4209b..235a81ad 100644
--- a/src/os/linux/linux_sigar.c
+++ b/src/os/linux/linux_sigar.c
@@ -441,9 +441,10 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
     mem->actual_free = mem->free + kern;
     mem->actual_used = mem->used - kern;
 
+    sigar_mem_calc_ram(sigar, mem);
+
     if (get_ram(sigar, mem) != SIGAR_OK) {
         /* XXX other options on failure? */
-        sigar_mem_calc_ram(sigar, mem);
     }
 
     return SIGAR_OK;
diff --git a/src/os/osf1/osf1_sigar.c b/src/os/osf1/osf1_sigar.c
index fdbca25b..5acb1d37 100644
--- a/src/os/osf1/osf1_sigar.c
+++ b/src/os/osf1/osf1_sigar.c
@@ -65,11 +65,11 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
         mem->free + mem->used +
         ((vmstats.inactive_count + vmstats.wire_count) * vmstats.pagesize);
 
-    sigar_mem_calc_ram(sigar, mem);
-
     mem->actual_free = mem->free;
     mem->actual_used = mem->used;
 
+    sigar_mem_calc_ram(sigar, mem);
+
     return SIGAR_OK;
 }
 
diff --git a/src/os/solaris/solaris_sigar.c b/src/os/solaris/solaris_sigar.c
index 728e4383..606ecf6e 100644
--- a/src/os/solaris/solaris_sigar.c
+++ b/src/os/solaris/solaris_sigar.c
@@ -172,8 +172,6 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
     mem->total = sysconf(_SC_PHYS_PAGES);
     mem->total <<= sigar->pagesize;
 
-    sigar_mem_calc_ram(sigar, mem);
-
     if (sigar_kstat_update(sigar) == -1) {
         return errno;
     }
@@ -194,6 +192,8 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
     mem->actual_free = mem->free;
     mem->actual_used = mem->used;
 
+    sigar_mem_calc_ram(sigar, mem);
+
     return SIGAR_OK;
 }
 
diff --git a/src/os/win32/win32_sigar.c b/src/os/win32/win32_sigar.c
index a227e578..88130493 100644
--- a/src/os/win32/win32_sigar.c
+++ b/src/os/win32/win32_sigar.c
@@ -627,11 +627,11 @@ SIGAR_DECLARE(int) sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
 
     mem->used = mem->total - mem->free;
 
-    sigar_mem_calc_ram(sigar, mem);
-
     mem->actual_free = mem->free;
     mem->actual_used = mem->used;
 
+    sigar_mem_calc_ram(sigar, mem);
+
     return SIGAR_OK;
 }
 
diff --git a/src/sigar_util.c b/src/sigar_util.c
index 5626b3dd..fdb2b677 100644
--- a/src/sigar_util.c
+++ b/src/sigar_util.c
@@ -334,6 +334,12 @@ int sigar_mem_calc_ram(sigar_t *sigar, sigar_mem_t *mem)
 
     mem->ram = ram;
 
+    mem->used_percent =
+        ((double)(mem->total - mem->actual_free) * 100) / mem->total;
+
+    mem->free_percent =
+        ((double)(mem->total - mem->actual_used) * 100) / mem->total;
+
     return ram;
 }