diff --git a/src/interestCalculator.c b/src/interestCalculator.c
index 67dcd86..b097ea4 100644
--- a/src/interestCalculator.c
+++ b/src/interestCalculator.c
@@ -1,7 +1,7 @@
 #include "interestCalculator.h"
 
 
-void calculateInterest(){
+void calculateYearlyInterest(){
     float principalAmount;
     float interestPerYear;
     float timeInYears;
@@ -29,17 +29,48 @@ void calculateInterest(){
     float result= principalAmount*(1+(interestDecimal*timeInYears));
     printf("\nAmount with the interest is %.2f.",result);
 }
+void calculateMonthlyInterest(){
+    float principalAmount;
+    float interestPerMonth;
+    float timeInMonths;
+
+    printf("Please enter the principal amount:");
+    scanf("%f",&principalAmount);
+    if(principalAmount<=0){
+        return;
+    }
+
+    printf("\nPlease enter interest per month (percentage):");
+    scanf("%f",&interestPerMonth);
+    if(interestPerMonth<=0){
+        return;
+    }
+
+    printf("\nPlease enter interest time in months:");
+    scanf("%f",&timeInMonths);
+    if(timeInMonths<=0){
+        return;
+    }
+
+    float interestDecimal=interestPerMonth/100;
+
+    float result= principalAmount*(1+(interestDecimal*timeInMonths));
+    printf("\nAmount with the interest is %.2f.",result);
+}
 
 void initiateCalculator(){
 
     int input;
     char c;
-    printf("Welcome to the interest calculator. Please select an option:\n[1]Calculate yearly interest\n");
+    printf("Welcome to the interest calculator. Please select an option:\n[1]Calculate yearly interest\n[2]Calculate monthly interest\n");
     scanf("%d", &input);
 
     switch(input){
         case 1:
-        calculateInterest();
+        calculateYearlyInterest();
+        break;
+        case 2:
+        calculateMonthlyInterest();
         break;
         default:
         break;
@@ -53,8 +84,8 @@ void initiateCalculator(){
     }
 }
 
-int main(){
+// int main(){
 
-    initiateCalculator();
+//     initiateCalculator();
 
-}
+// }
diff --git a/src/interestCalculator.h b/src/interestCalculator.h
index bd641cd..171dc12 100644
--- a/src/interestCalculator.h
+++ b/src/interestCalculator.h
@@ -3,5 +3,6 @@
 
 #include <stdio.h>
 
-void calculateInterest();
+void calculateYearlyInterest();
+void calculateMonthlyInterest();
 #endif
\ No newline at end of file