diff --git a/casr-logbook.cabal b/casr-logbook.cabal
--- a/casr-logbook.cabal
+++ b/casr-logbook.cabal
@@ -1,5 +1,5 @@
 name:               casr-logbook
-version:            0.0.3
+version:            0.0.4
 license:            OtherLicense
 license-file:       LICENSE
 author:             Tony Morris <ʇǝu˙sıɹɹoɯʇ@ןןǝʞsɐɥ>
diff --git a/changelog b/changelog
--- a/changelog
+++ b/changelog
@@ -1,3 +1,7 @@
+0.0.4
+
+* Add percentages to totals.
+
 0.0.3
 
 * Fix bug in merging two totals.
diff --git a/src/Data/Aviation/Casr/Logbook/Hours.hs b/src/Data/Aviation/Casr/Logbook/Hours.hs
--- a/src/Data/Aviation/Casr/Logbook/Hours.hs
+++ b/src/Data/Aviation/Casr/Logbook/Hours.hs
@@ -2,6 +2,7 @@
   Hours(..)
 , zeroHours
 , addHours
+, fractionalHours
 ) where
 
 import Data.Aviation.Casr.Logbook.Printer.Markdown
@@ -35,3 +36,10 @@
 instance Markdown Hours where
   markdown (Hours t p) =
     "* Hours: **`" ++ show t ++ "." ++ show p ++ "`**\n"
+
+fractionalHours ::
+  Fractional a =>
+  Hours
+  -> a
+fractionalHours (Hours f p) =
+  fromIntegral f + (fromIntegral p / 10)
diff --git a/src/Data/Aviation/Casr/Logbook/Totals.hs b/src/Data/Aviation/Casr/Logbook/Totals.hs
--- a/src/Data/Aviation/Casr/Logbook/Totals.hs
+++ b/src/Data/Aviation/Casr/Logbook/Totals.hs
@@ -18,6 +18,7 @@
 import Data.Foldable(foldl')
 import Data.Map(Map)
 import qualified Data.Map as Map
+import Text.Printf
 
 data Totals =
   Totals
@@ -58,7 +59,7 @@
         displayPoint x h =
           "* " ++ x ++ ": **`" ++ displayHours h ++ "`**\n"
         displayMap x m =
-          "* " ++ x ++ "\n" ++ Map.foldrWithKey (\k h s -> "  * " ++ k ++ ": **`" ++ displayHours h ++ "`**\n" ++ s) "" m
+          "* " ++ x ++ "\n" ++ Map.foldrWithKey (\k h s -> "  * " ++ k ++ ": **`" ++ displayHours h ++ " (" ++ printf "%.2f" (fractionalHours h / fractionalHours total * 100 :: Double) ++ "%)`**\n" ++ s) "" m
     in  concat
           [
             "##### Summary\n"