diff --git a/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/NetworkCalibrator.java b/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/NetworkCalibrator.java
index 8ff4a2e..4b34515 100644
--- a/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/NetworkCalibrator.java
+++ b/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/NetworkCalibrator.java
@@ -90,21 +90,27 @@ private NetworkCalibrator(Builder builder) {
         this.departureTime = builder.departureTime;
     }
 
-    public void performCalibration(Path odPairsPath) throws IOException, InterruptedException {
-        readOdPairs(odPairsPath);
+    public void performCalibration(Path odPairsPath, int maxOdPairsUsed) throws IOException, InterruptedException {
+        readOdPairs(odPairsPath, maxOdPairsUsed);
         adjustNetworkAverageSpeed();
         calibrate();
     }
 
-    void readOdPairs(Path odPairsPath) throws IOException {
+    void readOdPairs(Path odPairsPath, int maxOdPairsUsed) throws IOException {
         try (CSVParser parser = CSVFormat.Builder.create(CSVFormat.DEFAULT)
                 .setDelimiter(CsvUtils.detectDelimiter(odPairsPath.toString()))
                 .setHeader().setSkipHeaderRecord(true)
                 .build().parse(Files.newBufferedReader(odPairsPath))) {
+
+            int counter = 0;
             for (CSVRecord record : parser.getRecords()) {
+                if (counter > maxOdPairsUsed) {
+                    break;
+                }
                 String fromNodeIdString = record.get(FROM_NODE);
                 String toNodeIdString = record.get(TO_NODE);
                 odPairs.add(new Tuple<>(Id.createNodeId(fromNodeIdString), Id.createNodeId(toNodeIdString)));
+                counter++;
             }
         }
     }
diff --git a/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/RunNetworkCalibration.java b/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/RunNetworkCalibration.java
index a26d765..3e78da8 100644
--- a/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/RunNetworkCalibration.java
+++ b/src/main/java/org/matsim/accessibillityDrtOptimizer/network_calibration/RunNetworkCalibration.java
@@ -32,6 +32,10 @@ public class RunNetworkCalibration implements MATSimAppCommand {
     @CommandLine.Option(names = "--od-pairs", description = "Path to OD pair file (can also be the data base)", required = true)
     private Path odPairsPath;
 
+    @CommandLine.Option(names = "--max-od-pairs-used", description = "At most top x of od pairs from the od pair files are" +
+            " used for calibration", defaultValue = "100000")
+    private int maxOdPairsUsed;
+
     @CommandLine.Option(names = "--data-base", description = "Path to local data base (csv / tsv file)", required = true)
     private String dataBase;
 
@@ -62,7 +66,7 @@ public Integer call() throws Exception {
         NetworkCalibrator calibrator = new NetworkCalibrator.Builder(network, validator)
                 .setIterations(iterations).setCutOff(cutOff).setThreshold(threshold).setDepartureTime(departureTime)
                 .build();
-        calibrator.performCalibration(odPairsPath);
+        calibrator.performCalibration(odPairsPath, maxOdPairsUsed);
         Map<Integer, Double> scores = calibrator.getScores();
 
         // write calibrated network and score records