diff --git a/src/Output/QRFpdf.php b/src/Output/QRFpdf.php
index fdaa0c299..bb5e537ec 100644
--- a/src/Output/QRFpdf.php
+++ b/src/Output/QRFpdf.php
@@ -69,7 +69,7 @@ class QRFpdf extends QROutputAbstract{
 	public function dump(string $file = null):string{
 		$file ??= $this->options->cachefile;
 
-		$fpdf = new FPDF('P', 'pt', [$this->length, $this->length]);
+		$fpdf = new FPDF('P', $this->options->fpdfMeasureUnit, [$this->length, $this->length]);
 		$fpdf->AddPage();
 
 		$prevColor = null;
diff --git a/src/QROptions.php b/src/QROptions.php
index 985c304dd..5dbc1d4a2 100644
--- a/src/QROptions.php
+++ b/src/QROptions.php
@@ -45,6 +45,7 @@ use chillerlan\Settings\SettingsContainerAbstract;
  * @property int         $jpegQuality
  * @property string      $imagickFormat
  * @property string|null $imagickBG
+ * @property string      $fpdfMeasureUnit
  * @property array|null  $moduleValues
  */
 class QROptions extends SettingsContainerAbstract{
diff --git a/src/QROptionsTrait.php b/src/QROptionsTrait.php
index 0a2fd8247..69c8b1a54 100644
--- a/src/QROptionsTrait.php
+++ b/src/QROptionsTrait.php
@@ -14,7 +14,7 @@
 
 namespace chillerlan\QRCode;
 
-use function array_values, count, is_numeric, max, min, sprintf;
+use function array_values, count, in_array, is_numeric, max, min, sprintf, strtolower;
 
 /**
  * The QRCode plug-in settings & setter functionality
@@ -197,6 +197,13 @@ trait QROptionsTrait{
 	 */
 	protected ?string $imagickBG = null;
 
+	/**
+	 * Measurement unit for FPDF output: pt, mm, cm, in (defaults to "pt")
+	 *
+	 * @see \FPDF::__construct()
+	 */
+	protected string $fpdfMeasureUnit = 'pt';
+
 	/**
 	 * Module values map
 	 *
@@ -299,4 +306,17 @@ trait QROptionsTrait{
 
 	}
 
+	/**
+	 * sets the FPDF measurement unit
+	 */
+	protected function set_fpdfMeasureUnit(string $unit):void{
+		$unit = strtolower($unit);
+
+		if(in_array($unit, ['cm', 'in', 'mm', 'pt'], true)){
+			$this->fpdfMeasureUnit = $unit;
+		}
+
+		// @todo throw or ignore silently?
+	}
+
 }