diff --git a/cmd/influx_tsm/main.go b/cmd/influx_tsm/main.go
index ad41e71e41..592b2a4d58 100644
--- a/cmd/influx_tsm/main.go
+++ b/cmd/influx_tsm/main.go
@@ -201,16 +201,21 @@ func main() {
 	pg.Wait()
 
 	// Dump stats.
+	preSize := tsdb.ShardInfos(shards).Size()
+	postSize := TsmBytesWritten
 	fmt.Printf("\nSummary statistics\n========================================\n")
-	fmt.Printf("Databases converted:              %d\n", len(tsdb.ShardInfos(shards).Databases()))
-	fmt.Printf("Shards converted:                 %d\n", len(shards))
-	fmt.Printf("TSM files created:                %d\n", TsmFilesCreated)
-	fmt.Printf("Points read:                      %d\n", PointsRead)
-	fmt.Printf("Points written:                   %d\n", PointsWritten)
-	fmt.Printf("NaN filtered:                     %d\n", NanFiltered)
-	fmt.Printf("Inf filtered:                     %d\n", InfFiltered)
-	fmt.Printf("Points without fields filtered:   %d\n", b1.NoFieldsFiltered+bz1.NoFieldsFiltered)
-	fmt.Printf("Total conversion time:            %v\n", time.Now().Sub(conversionStart))
+	fmt.Printf("Databases converted:                 %d\n", len(tsdb.ShardInfos(shards).Databases()))
+	fmt.Printf("Shards converted:                    %d\n", len(shards))
+	fmt.Printf("TSM files created:                   %d\n", TsmFilesCreated)
+	fmt.Printf("Points read:                         %d\n", PointsRead)
+	fmt.Printf("Points written:                      %d\n", PointsWritten)
+	fmt.Printf("NaN filtered:                        %d\n", NanFiltered)
+	fmt.Printf("Inf filtered:                        %d\n", InfFiltered)
+	fmt.Printf("Points without fields filtered:      %d\n", b1.NoFieldsFiltered+bz1.NoFieldsFiltered)
+	fmt.Printf("Disk usage pre-conversion (bytes):   %d\n", preSize)
+	fmt.Printf("Disk usage post-conversion (bytes):  %d\n", postSize)
+	fmt.Printf("Reduction factor:                    %d%%\n", (100*preSize-postSize)/preSize)
+	fmt.Printf("Total conversion time:               %v\n", time.Now().Sub(conversionStart))
 	fmt.Println()
 }