diff --git a/src/Zxcvbn/Classes/TimeEstimator.php b/src/Zxcvbn/Classes/TimeEstimator.php
new file mode 100644
index 0000000..1de16d2
--- /dev/null
+++ b/src/Zxcvbn/Classes/TimeEstimator.php
@@ -0,0 +1,131 @@
+<?php
+
+    namespace Zxcvbn\Classes;
+
+    class TimeEstimator
+    {
+        /**
+         * @param $guesses
+         * @return array
+         */
+        public function estimateAttackTimes($guesses): array
+        {
+            $crack_times_seconds = [
+                'online_throttling_100_per_hour' => $guesses / (100 / 3600),
+                'online_no_throttling_10_per_second' => $guesses / 10,
+                'offline_slow_hashing_1e4_per_second' => $guesses / 1e4,
+                'offline_fast_hashing_1e10_per_second' => $guesses / 1e10
+            ];
+
+            $crack_times_display = array_map(
+                [ $this, 'displayTime' ],
+                $crack_times_seconds
+            );
+
+            return [
+                'crack_times_seconds' => $crack_times_seconds,
+                'crack_times_display' => $crack_times_display,
+                'score'               => $this->guessesToScore($guesses)
+            ];
+        }
+
+        /**
+         * @param $guesses
+         * @return int
+         */
+        protected function guessesToScore($guesses): int
+        {
+            $DELTA = 5;
+
+            if ($guesses < 1e3 + $DELTA)
+            {
+                return 0;
+            }
+
+            if ($guesses < 1e6 + $DELTA)
+            {
+                return 1;
+            }
+
+            if ($guesses < 1e8 + $DELTA)
+            {
+                return 2;
+            }
+
+            if ($guesses < 1e10 + $DELTA)
+            {
+                return 3;
+            }
+
+            return 4;
+        }
+
+        /**
+         * @param $seconds
+         * @return mixed|string
+         */
+        protected function displayTime($seconds)
+        {
+            $callback = function ($seconds)
+            {
+                $minute = 60;
+                $hour = $minute * 60;
+                $day = $hour * 24;
+                $month = $day * 31;
+                $year = $month * 12;
+                $century = $year * 100;
+
+                if ($seconds < 1)
+                {
+                    return [null, 'less than a second'];
+                }
+
+                if ($seconds < $minute)
+                {
+                    $base = round($seconds);
+                    return [$base, "$base second"];
+                }
+
+                if ($seconds < $hour)
+                {
+                    $base = round($seconds / $minute);
+                    return [$base, "$base minute"];
+                }
+
+                if ($seconds < $day)
+                {
+                    $base = round($seconds / $hour);
+                    return [$base, "$base hour"];
+                }
+
+                if ($seconds < $month)
+                {
+                    $base = round($seconds / $day);
+                    return [$base, "$base day"];
+                }
+
+                if ($seconds < $year)
+                {
+                    $base = round($seconds / $month);
+                    return [$base, "$base month"];
+                }
+
+                if ($seconds < $century)
+                {
+                    $base = round($seconds / $year);
+                    return [$base, "$base year"];
+                }
+
+                return [null, 'centuries'];
+            };
+
+            list($display_num, $display_str) = $callback($seconds);
+
+            if ($display_num > 1)
+            {
+                $display_str .= 's';
+            }
+
+            return $display_str;
+        }
+    }
diff --git a/src/Zxcvbn/package.json b/src/Zxcvbn/package.json
index 28f73e8..2df0136 100644
--- a/src/Zxcvbn/package.json
+++ b/src/Zxcvbn/package.json
@@ -36,6 +36,10 @@
             "required": true,
             "file": "Classes/Scorer.php"
         },
+        {
+            "required": true,
+            "file": "Classes/TimeEstimator.php"
+        },
         {
             "required": true,
             "file": "Classes/Utilities.php"