diff --git a/src/services/stripe.ts b/src/services/stripe.ts
index 73322a4..8c9d1af 100644
--- a/src/services/stripe.ts
+++ b/src/services/stripe.ts
@@ -1,6 +1,8 @@
 import { loadStripe } from '@stripe/stripe-js';
 import Stripe from 'stripe';
 
+import { calculateCurrencyAmount } from '@/utils/calculateCurrencyAmount';
+
 export default class StripeService {
   private stripe: Stripe;
 
@@ -36,9 +38,9 @@ export default class StripeService {
       metadata: { userId, plan },
     };
   
-    if (currency && currency !== 'usd') {
+    if (currency) {
       const unitAmount = price.unit_amount;
-      const newUnitAmount = unitAmount ? unitAmount * 6 : 0;
+      const newUnitAmount = calculateCurrencyAmount(String(unitAmount), currency);
       
       sessionData.line_items = [{
         price_data: {
diff --git a/src/utils/calculateCurrencyAmount.ts b/src/utils/calculateCurrencyAmount.ts
new file mode 100644
index 0000000..04f63db
--- /dev/null
+++ b/src/utils/calculateCurrencyAmount.ts
@@ -0,0 +1,14 @@
+const currencyRates: { [key: string]: number } = {
+    usd: 1,
+    brl: 6,
+};
+
+export const calculateCurrencyAmount = (amount: string, currency: string = 'usd'): number => {
+    const rate = currencyRates[currency.toLowerCase()];
+
+    if (rate === undefined) {
+        throw new Error(`Currency not supported: ${currency}`);
+    }
+
+    return Number(amount) * rate;
+};
\ No newline at end of file
diff --git a/src/utils/transformPurchasePlansDTO.ts b/src/utils/transformPurchasePlansDTO.ts
index 6de4f96..5bdf1b9 100644
--- a/src/utils/transformPurchasePlansDTO.ts
+++ b/src/utils/transformPurchasePlansDTO.ts
@@ -1,3 +1,5 @@
+import { calculateCurrencyAmount } from "./calculateCurrencyAmount";
+
 export interface InputData {
     id: string;
     productName: string;
@@ -21,7 +23,7 @@ interface Plan {
 
 type PlanDetails = Omit<Plan, 'priceMonthly' | 'priceAnnual' | 'idMonthly' | 'idAnnual'>;
 
-export function transformPurchasePlansDTO(data: InputData[], translate: (key: string) => string, currency?: string): Plan[] {
+export function transformPurchasePlansDTO(data: InputData[], translate: (key: string) => string, currency: string): Plan[] {
     const planDetails: Record<string, PlanDetails> = {
         "Starter": {
             id: "starter",
@@ -60,8 +62,8 @@ export function transformPurchasePlansDTO(data: InputData[], translate: (key: st
 
     const plansMap: Record<string, Plan> = {};
 
-    const setPlanPrice = (planName: string, interval: 'month' | 'year', amount: string, id: string, currency: string = 'usd'): void => {
-        const newUnitAmount = currency !== 'usd' ? Number(amount) * 6 : amount;
+    const setPlanPrice = (planName: string, interval: 'month' | 'year', amount: string, id: string, currency: string): void => {
+        const newUnitAmount = calculateCurrencyAmount(amount, currency);
 
 
         if (interval === 'month') {