diff --git a/12.Expense Tracker/expense.py b/12.Expense Tracker/expense.py
new file mode 100644
index 0000000..e49618f
--- /dev/null
+++ b/12.Expense Tracker/expense.py	
@@ -0,0 +1,81 @@
+#Expense Tracker:Build an app that helps users track their daily expenses and calculate total expenses.
+
+def track_expense():
+
+    expenses = []
+
+    def createNewAcc(amount,category,date,description):
+        expense = {
+        "amount": amount,
+        "category": category,
+        "date": date,
+        "description": description
+        }
+        expenses.append(expense)
+
+
+    def viewExpenses():
+        print("\n")
+        for expense in expenses:
+                print(f'{expense}')
+        print("\n")
+            
+
+    def calculateSum():
+        total = sum(expense["amount"] for expense in expenses)
+        print(f"\nTotal: {total}\n")
+
+
+    def filteredExpense():
+        category = input("\nEnter the category you want to filter=").lower()
+        found = False
+        for expense in expenses:
+            if expense['category'] == category:
+                print(f"\n{expense}\n")
+                found = True
+        if not found:
+                print("Category doesn't exists!!\n")
+
+        
+
+    print("Welcome to Expense Tracker")
+    while True:
+        print("1. Add new expense")
+        print("2. View all expenses")
+        print("3. Calculate sum of total expenses")
+        print("4. Filter expenses by category")
+        print("5. Exit")
+
+        try:
+            user_input = int(input("Enter your choice="))
+        except ValueError:
+            print("Enter a valid choice!")
+
+        if user_input == 1:
+            #amount category date description
+            amount = int(input("\nEnter the amount="))
+            category = input("Enter the category=")
+            date = input("Enter date (YYYY-MM-DD):")
+            description = input("Enter description for it=")
+            createNewAcc(amount,category,date,description)
+            print("Your expense has been stored successfully!\n")
+
+        elif user_input == 2:
+            viewExpenses()
+
+        elif user_input == 3:
+            calculateSum()
+
+        elif user_input == 4:
+            filteredExpense()
+        
+        elif user_input == 5:
+            print("Welcome Again🤗!")
+            exit()
+        
+        else:
+            print("Welcome🤗")
+            break
+            
+
+track_expense()
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diff --git a/13.Unit Converter/converter.py b/13.Unit Converter/converter.py
new file mode 100644
index 0000000..e74a414
--- /dev/null
+++ b/13.Unit Converter/converter.py	
@@ -0,0 +1,102 @@
+# Unit Converter:Create a program that converts between different units (length, weight, temperature, etc.).
+
+def lengthConverter():
+    print("\nLength Conversion:")
+    print("1.Meters to Kilometers")
+    print("2.Kilometers to Miles")
+    print("3.Miles to Yards\n")
+
+    x = float(input("Enter your choice="))
+    y = int(input("Enter the value to convert="))
+
+    if x == 1:
+        res = y/1000
+        print(f"The {y} Meters is equal to {res} Kilometers.")
+    
+    elif x == 2:
+        res = y*0.621
+        print(f"The {y} Kilometers is equal to {res} Miles.")
+
+    elif x == 3:
+        res = y * 1760
+        print(f"The {y} Miles is equal to {res} Yards.")
+
+    else:
+        print("Please enter a valid choice!!")
+
+def weightConverter():
+    print("\nWeight Conversion:")
+    print("1. Kilograms to Pounds")
+    print("2. Pounds to Ounces")
+    print("3. Grams to Kilograms\n")
+
+    x = int(input("Enter your choice="))
+    y = int(input("Enter the value to convert="))
+
+    if x == 1:
+        res = y*2.20
+        rounded_value = round(res,2)
+        print(f"The {y} kilogram is equal to {rounded_value} Pounds.")
+    
+    elif x == 2:
+        res = y*16
+        print(f"The {y} Pounds is equal to {res} Ounces.")
+
+    elif x == 3:
+        res = y/1000
+        print(f"The {y} Grams is equal to {res} Kilograms.")
+
+    else:
+        print("Please enter a valid choice!!")
+
+def tempConverter():
+    print("\nTemperature Conversion:")
+    print("1. Celsius to Fahrenheit")
+    print("2. Fahrenheit to Celsius")
+    print("3. Celsius to Kelvin\n")
+
+    x = int(input("Enter your choice="))
+    y = int(input("Enter the temperature value="))
+
+    if x == 1:
+        res = (y* 9/5) + 32
+        print(f"The {y} celsius is equal to {res} Fahrenheit.")
+
+    elif x == 2:
+        res = (y - 32) * 5/9
+        print(f"The {res} Fahrenheit is equal to {res} Celsius.")
+    
+    elif x == 3:
+        res = y + 273.15
+        print(f"The {y} celsius is equal to {res} Kelvin.")
+
+    else:
+        print("Please enter a valid choice!!")
+
+
+def main():
+    print("Welcome to Converter System😃")
+
+    while True:
+        print("\n1.Length Converter")
+        print("2. Weight Converter")
+        print("3. Temperature Converter\n")
+        
+        try:
+            user_input = int(input("Enter your choice="))
+        except ValueError:
+            print("No string or special character is allowed to enter here.")
+
+        if user_input == 1:
+            lengthConverter()
+
+        elif user_input == 2:
+            weightConverter()
+
+        elif user_input == 3:
+            tempConverter()
+        
+        else:
+            print("Please enter a valid choice!!")
+
+main()
\ No newline at end of file