diff --git a/client/garageserver.io.js b/client/garageserver.io.js
index f14b0a0..cb6a34f 100644
--- a/client/garageserver.io.js
+++ b/client/garageserver.io.js
@@ -7,7 +7,7 @@ options = {
     onPlayerRemove: function (id),
     onGameState: function (),
     onPing: function (pingDelay),
-    onUpdatePlayerPhysics: function (state, inputs),
+    onUpdatePlayerPhysics: function (state, inputs, deltaTime),
     onInterpolation: function(currentState, previousState, targetState, amount)
     logging: true,
     clientSidePrediction: true,
@@ -233,7 +233,7 @@ window.GarageServerIO = (function (window, socketio) {
             _inputController.addInput(clientInput);
 
             if (_options.clientSidePrediction && _options.onUpdatePlayerPhysics) {
-                _stateController.state = _options.onUpdatePlayerPhysics(_stateController.state, [{ input: clientInput }]);
+                _stateController.state = _options.onUpdatePlayerPhysics(_stateController.state, [{ input: clientInput }], _stateController.physicsDelta);
             }
             _socket.emit('input', { input: clientInput, seq: _inputController.sequenceNumber, time: _stateController.renderTime });
         },
@@ -264,7 +264,7 @@ window.GarageServerIO = (function (window, socketio) {
             _inputController.removeUpToSequence(playerState.seq);
 
             if (_options.clientSidePrediction && _inputController.any()) {
-                _stateController.state = _options.onUpdatePlayerPhysics(_stateController.state, _inputController.inputs);
+                _stateController.state = _options.onUpdatePlayerPhysics(_stateController.state, _inputController.inputs, _stateController.physicsDelta);
             }
         },
         
diff --git a/example/shared/core.js b/example/shared/core.js
index badf04c..b34581a 100644
--- a/example/shared/core.js
+++ b/example/shared/core.js
@@ -1,20 +1,21 @@
 (function(exports){
 
-   exports.OnProcessGamePhysics = function (state, inputs) {
+   exports.OnProcessGamePhysics = function (state, inputs, deltaTime) {
        var i = 0;
+
        if (!state.x && !state.y) {
            state.x = 0;
            state.y = 0;
         }
         for (i = 0; i < inputs.length; i ++) {
             if (inputs[i].input === 'left') {
-                state.x -= 1;
+                state.x -= (50 * deltaTime);
             } else if (inputs[i].input === 'right') {
-                state.x += 1;
+                state.x += (50 * deltaTime);
             } else if (inputs[i].input === 'down') {
-                state.y += 1;
+                state.y += (50 * deltaTime);
             } else if (inputs[i].input === 'up') {
-                state.y -= 1;
+                state.y -= (50 * deltaTime);
             }
         }
         return state;
diff --git a/lib/server/garageserver.io.js b/lib/server/garageserver.io.js
index 7fa49f2..bc14934 100644
--- a/lib/server/garageserver.io.js
+++ b/lib/server/garageserver.io.js
@@ -16,7 +16,7 @@ options = {
 
 function GarageServer (socketio, options) {
     this.io = socketio;
-    this.physicsInterval = options.physicsInterval ? options.physicsInterval : 15;
+    this.physicsDelta = (options.physicsInterval ? options.physicsInterval : 15) / 1000;
     this.game = new garageServerGame.createGame(options);
     this.registerSocketEvents(options);
 }
@@ -28,7 +28,7 @@ GarageServer.prototype.registerSocketEvents = function (options) {
         if (options.logging) {
             console.log('garageserver.io:: socket ' + socket.id + ' connection');
         }
-        socket.emit('state', { physicsDelta: self.physicsInterval });
+        socket.emit('state', { physicsDelta: self.physicsDelta });
         self.onPlayerConnect(socket, options);
 
         socket.on('disconnect', function () {
diff --git a/lib/server/garageservergame.js b/lib/server/garageservergame.js
index 504eb47..337eec2 100644
--- a/lib/server/garageservergame.js
+++ b/lib/server/garageservergame.js
@@ -7,7 +7,7 @@ function GarageServerGame(options) {
     this.startTime = new Date().getTime();
     this.physicsInterval = options.physicsInterval ? options.physicsInterval : 15;
     this.stateInterval = options.stateInterval ? options.stateInterval : 45;
-
+    this.physicsDelta = this.physicsInterval / 1000;
     this.physicsIntervalId = setInterval(function () { self.updatePhysics(options); }, this.physicsInterval);
     this.stateIntervalId = setInterval(function () { self.updateState(options); }, this.stateInterval);
 }
@@ -35,10 +35,11 @@ GarageServerGame.prototype.updateEntities = function (options) {
 };
 
 GarageServerGame.prototype.updatePhysics = function (options) {
+    var self = this;
     this.players.forEach(function (player) {
         if (player.inputs.length > 0) {
             if (options.onUpdatePlayerPhysics) {
-                player.state = options.onUpdatePlayerPhysics(player.state, player.inputs);
+                player.state = options.onUpdatePlayerPhysics(player.state, player.inputs, self.physicsDelta);
             }
             player.sequence += player.inputs.length;
             player.inputs = [];