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Calculadora Capital

Personal Loan Calculator (Portugal)

How much will a personal loan cost you each month? This calculator estimates the monthly payment from the amount, the nominal annual rate (TAN) and the term in months, and shows the total you pay and the total cost of the credit. It also computes the TAEG (the APR), the rate that bundles the interest and the upfront fee to measure the real cost of the loan.

The payment is built from the TAN (nominal annual rate). The TAEG (APR) bundles the interest and the upfront fee and measures the real cost of the credit. Leave fees at zero if you only want the payment.

Monthly payment
€202.29
TAEG / APR (real cost)
8.19%
Total cost of credit
€2,137.14

Loan summary

Amount financed€10,000.00
TAN (nominal annual rate)7.9%
TAEG (effective cost)8.19%
Number of payments60
Total paid (60 payments)€12,137.14
Of which interest€2,137.14
Total cost of credit€2,137.14

Educational estimate, not financial advice. It computes the capital-and-interest payment (French system) at the TAN you choose and the TAEG with the upfront fee you enter. It excludes monthly commissions, insurance and stamp duty, which can raise the bank's real TAEG.

What a personal loan is

A personal loan (a form of consumer credit) is a loan with a fixed amount and term, usually at a fixed rate, repaid in equal monthly instalments. People use it for things like home improvements, a car, education or to consolidate debts. Unlike a mortgage, it is not secured on a property, so interest rates are higher and terms are shorter.

How the payment is calculated

The monthly payment is constant (the "French" amortisation system): each instalment covers that month’s interest on the outstanding balance and repays the rest. The formula is payment = principal × i / (1 − (1 + i)^−n), where i is the monthly rate (the TAN divided by 12) and n is the number of months. A longer term means a smaller payment but more interest overall.

TAN and TAEG: the difference that matters

The TAN (nominal annual rate) is the rate that drives the payment. The TAEG (the APR) measures the real cost of the credit: it bundles the interest with every charge, such as the arrangement fee, stamp duty and monthly commissions. The TAEG is therefore always higher than the TAN, and it is the number to compare between offers. The calculator shows the TAEG with the upfront fee you enter.

Worked example

On a €10,000 personal loan over 60 months (5 years), with a 7.9% TAN and no fees, the payment is about €202.29 a month. Over the 5 years you would pay about €12,137, of which €2,137 is interest, and the TAEG would be 8.19%. With a €250 arrangement fee the payment would not change, but the TAEG would rise to reflect that charge.

Frequently asked questions

How is a personal loan payment calculated?
The constant monthly payment is given by the amortisation (French-system) formula: payment = principal × i / (1 − (1 + i)^−n), where i is the monthly rate (the TAN ÷ 12) and n is the number of months in the term. This calculator applies that formula to the amount, the TAN and the term you enter.
What is the difference between the TAN and the TAEG?
The TAN (nominal annual rate) is the interest rate that drives the payment. The TAEG (APR) includes the interest plus every cost of the credit, such as the arrangement fee, monthly commissions and stamp duty. The TAEG is always higher than the TAN and is the right rate to compare offers from different banks.
Why is the TAEG higher than the TAN even with no fees?
Because interest is charged every month and compounds over the year. With no fees, the TAEG is the TAN compounded monthly: (1 + TAN/12)^12 − 1. For example, a 7.9% TAN corresponds to a TAEG of about 8.19%. Any fee or tax pushes the TAEG higher still.
What is included in this estimate?
The payment includes capital and interest at the TAN you choose. The TAEG also includes the upfront fee you enter. It excludes monthly processing commissions, associated insurance and stamp duty on the credit, which raise the real TAEG a bank shows in its standardised information sheet.
Are the figures guaranteed?
No. It is an educational estimate at the rate and term you choose. A real bank offer may include commissions, insurance and taxes, and is subject to credit approval. The rate also cannot exceed the maximum rate Banco de Portugal publishes each quarter. It is not financial advice.

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Author: Thorben Rasmus Idel · Reviewed by: Nahar Geva · Last reviewed: 2026-06-11