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diff --git a/src/Xmobar/Plugins/Monitors/Cpu/FreeBSD.hs b/src/Xmobar/Plugins/Monitors/Cpu/FreeBSD.hs
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+++ b/src/Xmobar/Plugins/Monitors/Cpu/FreeBSD.hs
@@ -0,0 +1,49 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Cpu.FreeBSD
+-- Copyright   :  (c) 2011, 2017 Jose Antonio Ortega Ruiz
+--                (c) 2007-2010 Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A cpu monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Cpu.FreeBSD (parseCpu
+                                           , CpuDataRef
+                                           , cpuData) where
+
+import Xmobar.Plugins.Monitors.Cpu.Common (CpuData(..))
+import Data.IORef (IORef, readIORef, writeIORef)
+import System.BSD.Sysctl (sysctlPeekArray)
+
+-- kern.cp_time data from the previous iteration for computing the difference
+type CpuDataRef = IORef [Word]
+
+cpuData :: IO [Word]
+cpuData = sysctlPeekArray "kern.cp_time" :: IO [Word]
+
+parseCpu :: CpuDataRef -> IO CpuData
+parseCpu cref = do
+    prev <- readIORef cref
+    curr <- cpuData
+    writeIORef cref curr
+    let diff = map fromIntegral $ zipWith (-) curr prev
+        user = head diff
+        nice = diff !! 1
+        system = diff !! 2
+        intr = diff !! 3
+        idle = diff !! 4
+        total = user + nice + system + intr + idle
+    return CpuData
+      { cpuUser = user/total
+      , cpuNice = nice/total
+      , cpuSystem = (system+intr)/total
+      , cpuIdle = idle/total
+      , cpuIowait = 0
+      , cpuTotal = user/total
+      }