diff --git a/lib/element-properties.js b/lib/element-properties.js
index a23cf64d..21bb808e 100644
--- a/lib/element-properties.js
+++ b/lib/element-properties.js
@@ -6,6 +6,7 @@ class ElementProperties {
         this._y = 0;
         this._cx = 0;
         this._cy = 0;
+        this._dpi = 72;
         this.options = {};
     }
 
@@ -16,12 +17,13 @@ class ElementProperties {
         this.y(this._y);
         this.cx(this._cx);
         this.cy(this._cy);
+        this.dpi(this._dpi);
     }
 
     x(val) {
         if (arguments.length === 0) {
             if (this.properties !== undefined) {
-                return PptxUnitHelper.toPixels(this.properties['a:off'][0]['$'].x);
+                return PptxUnitHelper.toPixels(this.properties['a:off'][0]['$'].x, this.properties['a:off'][0]['$'].dpi);
             } else {
                 return this._x;
             }
@@ -29,7 +31,7 @@ class ElementProperties {
             this._x = val;
 
             if (this.properties !== undefined) {
-                this.properties['a:off'][0]['$'].x = PptxUnitHelper.fromPixels(val);
+                this.properties['a:off'][0]['$'].x = PptxUnitHelper.fromPixels(val, this._dpi);
             }
         }
 
@@ -39,7 +41,7 @@ class ElementProperties {
     y(val) {
         if (arguments.length === 0) {
             if (this.properties !== undefined) {
-                return PptxUnitHelper.toPixels(this.properties['a:off'][0]['$'].y);
+                return PptxUnitHelper.toPixels(this.properties['a:off'][0]['$'].y, this.properties['a:off'][0]['$'].dpi);
             } else {
                 return this._y;
             }
@@ -47,7 +49,7 @@ class ElementProperties {
             this._y = val;
 
             if (this.properties !== undefined) {
-                this.properties['a:off'][0]['$'].y = PptxUnitHelper.fromPixels(val);
+                this.properties['a:off'][0]['$'].y = PptxUnitHelper.fromPixels(val, this._dpi);
             }
         }
 
@@ -57,7 +59,7 @@ class ElementProperties {
     cx(val) {
         if (arguments.length === 0) {
             if (this.properties !== undefined) {
-                return PptxUnitHelper.toPixels(this.properties['a:ext'][0]['$'].cx);
+                return PptxUnitHelper.toPixels(this.properties['a:ext'][0]['$'].cx, this.properties['a:off'][0]['$'].dpi);
             } else {
                 return this._cx;
             }
@@ -65,7 +67,7 @@ class ElementProperties {
             this._cx = val;
 
             if (this.properties !== undefined) {
-                this.properties['a:ext'][0]['$'].cx = PptxUnitHelper.fromPixels(val);
+                this.properties['a:ext'][0]['$'].cx = PptxUnitHelper.fromPixels(val, this._dpi);
             }
         }
 
@@ -75,7 +77,7 @@ class ElementProperties {
     cy(val) {
         if (arguments.length === 0) {
             if (this.properties !== undefined) {
-                return PptxUnitHelper.toPixels(this.properties['a:ext'][0]['$'].cy);
+                return PptxUnitHelper.toPixels(this.properties['a:ext'][0]['$'].cy, this.properties['a:off'][0]['$'].dpi);
             } else {
                 return this._cy;
             }
@@ -83,7 +85,21 @@ class ElementProperties {
             this._cy = val;
 
             if (this.properties !== undefined) {
-                this.properties['a:ext'][0]['$'].cy = PptxUnitHelper.fromPixels(val);
+                this.properties['a:ext'][0]['$'].cy = PptxUnitHelper.fromPixels(val, this._dpi);
+            }
+        }
+
+        return this;
+    }
+
+    dpi(val) {
+        if (arguments.length === 0) {
+            return this._dpi;
+        } else {
+            this._dpi = val;
+
+            if (this.properties !== undefined) {
+                this.properties['a:off'][0]['$'].dpi = val;
             }
         }
 
diff --git a/lib/helpers/unit-helper.js b/lib/helpers/unit-helper.js
index 640185d6..f042b71e 100644
--- a/lib/helpers/unit-helper.js
+++ b/lib/helpers/unit-helper.js
@@ -4,24 +4,24 @@ class PptxUnitHelper {
         return Math.floor(val * 914400);
     }
 
-    static fromPoints(val) {
-        return Math.floor(val * 914400 / 72);
+    static fromPoints(val, dpi = 72) {
+        return Math.floor(val * 914400 / dpi);
     }
 
-    static fromPixels(val) {
-        return Math.floor(val * 914400 / 72);
+    static fromPixels(val, dpi = 72) {
+        return Math.floor(val * 914400 / dpi);
     }
 
-    static toPixels(val) {
-        return val * 72 / 914400;
+    static toPixels(val, dpi = 72) {
+        return val * dpi / 914400;
     }
 
     static toInches(val) {
         return val / 914400;
     }
 
-    static toPoints(val) {
-        return val / 914400 * 72;
+    static toPoints(val, dpi = 72) {
+        return val / 914400 * dpi;
     }
 
     static fromCm(val) {