diff --git a/src/main/c/Stefan/blackjack.c b/src/main/c/Stefan/blackjack.c
index 2268373..3c2a20c 100644
--- a/src/main/c/Stefan/blackjack.c
+++ b/src/main/c/Stefan/blackjack.c
@@ -106,4 +106,12 @@ bool checkForBlackjack(int userCardArray[]){
         return true;
     }
     return false;
+}
+
+int calculateCardsTotal(int cardsArray[], int len){
+    int sum = 0;
+    for(int i = 0; i < len; i++){
+        sum += cardsArray[i];
+    }
+    return sum;
 }
\ No newline at end of file
diff --git a/src/main/c/Stefan/blackjack.h b/src/main/c/Stefan/blackjack.h
index 1388b18..be79c7b 100644
--- a/src/main/c/Stefan/blackjack.h
+++ b/src/main/c/Stefan/blackjack.h
@@ -10,5 +10,6 @@ int userInputBJ();
 int getRandCard();
 int playBJ(int bet, int balance);
 bool checkForBlackjack(int userCards[]);
+int calculateCardsTotal(int cardsArray[], int len);
 
 #endif // BLACKJACK_H
\ No newline at end of file
diff --git a/src/test/c/Stefan/test_blackjack.c b/src/test/c/Stefan/test_blackjack.c
index 6217651..2d6b01c 100644
--- a/src/test/c/Stefan/test_blackjack.c
+++ b/src/test/c/Stefan/test_blackjack.c
@@ -30,4 +30,18 @@ void test_no_blackjack() {
     //assert
     TEST_ASSERT_FALSE(result);
 
+}
+
+void test_2_cards_total_equals_20() {
+
+    //arrange
+    int userCards[] = {10, 10};
+    int expected_result = 20;
+
+    //act
+    int actual_result = calculateCardsTotal(userCards, 2);
+
+    //assert
+    TEST_ASSERT_EQUAL_INT(expected_result, actual_result);
+
 }
\ No newline at end of file