diff --git a/README.md b/README.md
index 17bb68c..4995963 100644
--- a/README.md
+++ b/README.md
@@ -98,7 +98,7 @@ Prop | Description
 `onReady` | Called when media is loaded and ready to play. If `playing` is set to `true`, media will play immediately
 `onStart` | Called when media starts playing
 `onPlay` | Called when media starts or resumes playing after pausing or buffering
-`onProgress` | Callback containing `played` and `loaded` progress as a fraction<br />eg `{ played: 0.12, loaded: 0.34 }`
+`onProgress` | Callback containing progress `played`, `loaded` (fraction), `playedSeconds` and `loadedSeconds` (seconds)<br />eg `{ played: 0.12, playedSeconds: 11.3, loaded: 0.34, loadedSeconds: 16.7 }`
 `onDuration` | Callback containing duration of the media, in seconds
 `onPause` | Called when media is paused
 `onBuffer` | Called when media starts buffering
diff --git a/src/ReactPlayer.js b/src/ReactPlayer.js
index 1aa80a1..c23247c 100644
--- a/src/ReactPlayer.js
+++ b/src/ReactPlayer.js
@@ -39,12 +39,19 @@ export default class ReactPlayer extends Component {
     if (this.props.url && this.player) {
       const loaded = this.player.getFractionLoaded() || 0
       const played = this.player.getFractionPlayed() || 0
+      const duration = this.player.getDuration()
       const progress = {}
       if (loaded !== this.prevLoaded) {
         progress.loaded = loaded
+        if (duration) {
+          progress.loadedSeconds = progress.loaded * duration
+        }
       }
       if (played !== this.prevPlayed) {
         progress.played = played
+        if (duration) {
+          progress.playedSeconds = progress.played * duration
+        }
       }
       if (progress.loaded || progress.played) {
         this.props.onProgress(progress)