diff --git a/app/models.py b/app/models.py
index 52e782b..cde00f2 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, Integer, String
+from sqlalchemy import DateTime, Float, ForeignKey, Integer, String
 from sqlalchemy.orm import Mapped, mapped_column
 
 from .db import Base
@@ -11,7 +11,7 @@ class Drink(Base):
 
     id: Mapped[int] = mapped_column(Integer, primary_key=True)
     name: Mapped[str] = mapped_column(String)
-    price: Mapped[int] = mapped_column(Integer)
+    price: Mapped[float] = mapped_column(Integer)
     stock: Mapped[int] = mapped_column(Integer)
     stocked_by: Mapped[str] = mapped_column(String)
 
@@ -24,4 +24,5 @@ class Transaction(Base):
     drink: Mapped[int] = mapped_column(Integer, ForeignKey(Drink.id))
     user_name: Mapped[str] = mapped_column(String)
     quantity: Mapped[int] = mapped_column(Integer)
+    cost: Mapped[float] = mapped_column(Float)
     timestamp: Mapped[datetime] = mapped_column(DateTime)
diff --git a/app/routes.py b/app/routes.py
index 3bdfea9..82e4856 100644
--- a/app/routes.py
+++ b/app/routes.py
@@ -90,6 +90,33 @@ def restock_drink_post(id: int) -> Response | tuple[str, int]:  # noqa: A002
     return redirect(url_for("main.manage_drink_get", id=id))
 
 
+@bp.post("/drink/<id>/price")
+def change_price_post(id: int) -> Response | tuple[str, int]:  # noqa: A002
+    session = SessionLocal()
+
+    drink = session.get(Drink, id)
+    if drink is None:
+        return "Drink not found", 404
+
+    price_raw = request.form.get("price")
+
+    if price_raw is None:
+        return "Missing fields", 400
+
+    try:
+        price = float(price_raw)
+    except ValueError:
+        return "Non numeric amount", 400
+
+    if price <= 0:
+        return "Invalid price", 400
+
+    drink.price = price
+    session.commit()
+
+    return redirect(url_for("main.manage_drink_get", id=id))
+
+
 @bp.post("/drink/<id>/delete")
 def delete_drink_post(id: int) -> Response | tuple[str, int]:  # noqa: A002
     session = SessionLocal()
@@ -161,8 +188,13 @@ def buy_drink_post(id: int) -> Response | tuple[str, int]:  # noqa: A002
     # Update stock
     drink.stock -= quantity
 
+    # Calculate cost
+    cost = drink.price * quantity
+
     # Create transaction
-    transaction = Transaction(drink=drink.id, user_name=name, quantity=quantity, timestamp=datetime.now().astimezone())
+    transaction = Transaction(
+        drink=drink.id, user_name=name, quantity=quantity, cost=cost, timestamp=datetime.now().astimezone()
+    )
 
     session.add(transaction)
     session.commit()
@@ -187,6 +219,7 @@ def list_transactions_get() -> str:
             "drink_name": drinks[t.drink].name if t.drink in drinks else "<removed drink>",
             "user_name": t.user_name,
             "quantity": t.quantity,
+            "cost": t.cost,
             "timestamp": t.timestamp,
         }
         for t in txs
diff --git a/app/templates/drink_manage.html b/app/templates/drink_manage.html
index 98d123f..b768237 100644
--- a/app/templates/drink_manage.html
+++ b/app/templates/drink_manage.html
@@ -11,7 +11,7 @@
 
     <div class="card">
         <h2>{{ drink.name }}</h2>
-        <p>Price: {{ drink.price }}€</p>
+        <p>Price: {{ "%.2f"|format(drink.price) }}€</p>
         <p>Stock: {{ drink.stock }}</p>
     </div>
 
@@ -26,6 +26,17 @@
         </form>
     </div>
 
+    <div class="card">
+        <h3>Adjust price</h3>
+        <form method="POST" action="/drink/{{ drink.id }}/price">
+            <label>
+                New price:
+                <input type="number" step="0.01" name="price" required>
+            </label>
+            <button class="button" type="submit">Change price</button>
+        </form>
+    </div>
+
     <div class="card">
         <h3>Danger zone</h3>
         <form method="POST" action="/drink/{{ drink.id }}/delete" onsubmit="return confirm('Delete this drink?');">
diff --git a/app/templates/transactions.html b/app/templates/transactions.html
index 7d9e7bc..ca4f301 100644
--- a/app/templates/transactions.html
+++ b/app/templates/transactions.html
@@ -19,6 +19,7 @@
                         <th>Drink</th>
                         <th>User</th>
                         <th>Qty</th>
+                        <th>Value</th>
                         <th>Time</th>
                     </tr>
                 </thead>
@@ -28,6 +29,7 @@
                             <td>{{ t.drink_name }}</td>
                             <td>{{ t.user_name }}</td>
                             <td>{{ t.quantity }}</td>
+                            <td>{{ "%.2f"|format(t.cost) }}€</td>
                             <td class="muted">
                                 {{ t.timestamp.strftime("%Y-%m-%d %H:%M") }}
                             </td>