diff --git a/app/src/main/java/eu/depau/etchdroid/activities/ConfirmationActivity.kt b/app/src/main/java/eu/depau/etchdroid/activities/ConfirmationActivity.kt
index 9cbfb34..c22955d 100644
--- a/app/src/main/java/eu/depau/etchdroid/activities/ConfirmationActivity.kt
+++ b/app/src/main/java/eu/depau/etchdroid/activities/ConfirmationActivity.kt
@@ -28,8 +28,10 @@ class ConfirmationActivity : ActivityBase() {
         setContentView(R.layout.activity_confirmation)
         actionBar?.setDisplayHomeAsUpEnabled(true)
 
-        displayDetails()
+        // displayImageLayout must be called before displayDetails
+        // to ensure uncompressed image size is available
         displayImageLayout()
+        displayDetails()
     }
 
     fun displayDetails() {
@@ -46,8 +48,17 @@ class ConfirmationActivity : ActivityBase() {
         if (confirm_sel_image.text == null)
             confirm_sel_image.text = getString(R.string.unknown_filename)
 
-        val imgSize = StateKeeper.imageFile?.getFileSize(this)
-        confirm_sel_image_size.text = imgSize?.toHRSize()
+        val imgSize: Long?
+        val sizeStr: String?
+        if (StateKeeper.imageRepr?.size != null) {
+            imgSize = StateKeeper.imageRepr?.size
+            sizeStr = imgSize?.toHRSize() + " (uncompressed)"
+        } else {
+            imgSize = StateKeeper.imageFile?.getFileSize(this)
+            sizeStr = imgSize?.toHRSize()
+        }
+
+        confirm_sel_image_size.text = sizeStr
 
         confirm_sel_usbdev.text = StateKeeper.usbDevice?.name
 
@@ -63,12 +74,7 @@ class ConfirmationActivity : ActivityBase() {
                     if (imgSize!! > devSize)
                         confirm_extra_info.text = getString(R.string.image_bigger_than_usb)
                     else {
-                        var text =
-                                if (StateKeeper.flashMethod == FlashMethod.FLASH_DMG_API)
-                                    getString(R.string.no_image_size_check_dmg) + "\n"
-                                else
-                                    ""
-                        text += getString(R.string.tap_next_to_write)
+                        val text = getString(R.string.tap_next_to_write)
                         confirm_extra_info.text = text
                         canContinue = true
                     }
diff --git a/app/src/main/java/eu/depau/etchdroid/img_types/DMGImage.kt b/app/src/main/java/eu/depau/etchdroid/img_types/DMGImage.kt
index f16dfe0..d1422f7 100644
--- a/app/src/main/java/eu/depau/etchdroid/img_types/DMGImage.kt
+++ b/app/src/main/java/eu/depau/etchdroid/img_types/DMGImage.kt
@@ -13,9 +13,10 @@ import java.io.File
 val SECTOR_SIZE = 512
 private val partRegex = Regex("partition (\\d+): begin=(\\d+), size=(\\d+), decoded=(\\d+), firstsector=(\\d+), sectorcount=(\\d+), blocksruncount=(\\d+)\\s+(.*) \\((.+) : \\d+\\)", RegexOption.MULTILINE)
 
-private fun readPartitionTable(dmg2img: File, libDir: String, file: File): Pair<PartitionTableType?, List<Partition>?> {
+private fun readPartitionTable(dmg2img: File, libDir: String, file: File): Triple<PartitionTableType?, List<Partition>?, Long?> {
     val pt = ArrayList<Partition>()
     var ptType: PartitionTableType? = null
+    var imgSize = 0L
 
     val pb = ProcessBuilder(dmg2img.path, "-v", "-l", file.path)
     pb.environment()["LD_LIBRARY_PATH"] = libDir
@@ -39,6 +40,7 @@ private fun readPartitionTable(dmg2img: File, libDir: String, file: File): Pair<
 
         pb.number = number.toInt()
         pb.size = SECTOR_SIZE * sectorcount.toLong()
+        imgSize += pb.size!!
 
         if (label.isNotEmpty())
             pb.fsLabel = label
@@ -67,7 +69,7 @@ private fun readPartitionTable(dmg2img: File, libDir: String, file: File): Pair<
         pt.add(pb.build())
     }
 
-    return Pair(ptType, pt)
+    return Triple(ptType, pt, imgSize)
 }
 
 class DMGImage(private val uri: Uri, private val context: Context) : Image {
@@ -76,14 +78,16 @@ class DMGImage(private val uri: Uri, private val context: Context) : Image {
     private var loaded: Boolean = false
     private var partTable: List<Partition>? = null
     private var partTableType: PartitionTableType? = null
+    private var imgSize: Long? = null
 
     private fun readInfo() {
         if (loaded)
             return
-        val pair = readPartitionTable(dmg2img, libDir, File(uri.path))
+        val triple = readPartitionTable(dmg2img, libDir, File(uri.path))
         loaded = true
-        partTableType = pair.first
-        partTable = pair.second
+        partTableType = triple.first
+        partTable = triple.second
+        imgSize = triple.third
     }
 
     override val partitionTable: List<Partition>?
@@ -99,4 +103,10 @@ class DMGImage(private val uri: Uri, private val context: Context) : Image {
             return partTableType
         }
 
+    override val size: Long?
+        get() {
+            readInfo()
+            return imgSize
+        }
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/eu/depau/etchdroid/img_types/Image.kt b/app/src/main/java/eu/depau/etchdroid/img_types/Image.kt
index 5ea7bb7..f87b56e 100644
--- a/app/src/main/java/eu/depau/etchdroid/img_types/Image.kt
+++ b/app/src/main/java/eu/depau/etchdroid/img_types/Image.kt
@@ -6,4 +6,5 @@ import eu.depau.etchdroid.utils.Partition
 interface Image {
     val partitionTable: List<Partition>?
     val tableType: PartitionTableType?
+    val size: Long?
 }
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 42e1c38..f1bca8e 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -71,7 +71,6 @@
     <string name="fs_label">Label</string>
     <string name="fs_type">Type</string>
     <string name="part_size">Size</string>
-    <string name="no_image_size_check_dmg">Image size checks can\'t be performed on DMG images. Make sure the USB drive is large enough before flashing.</string>
     <string name="license_gpl3">GNU GPLv3</string>
     <string name="this_app">This app</string>
     <string name="license_apache2_0">Apache 2.0</string>