Investment Calculators
Simple, free tools to plan your finances. Start with compound interest.
Compound Interest Calculator
Compound interest is interest that earns interest on the interest already accrued. By reinvesting what you earn, your money grows faster over time. Use the calculator to see how much you could accumulate from an initial amount plus monthly contributions.
Open calculator →Simple Interest Calculator
Simple interest is always earned only on the initial capital: the base never changes. Use the calculator to see how much it earns, and compare side by side with the effect of compound interest.
Open calculator →Savings Calculator
Have a savings goal and want to know how much to set aside each month to reach it? Enter the target, what you have already saved, the time frame and an interest rate. The calculator shows the monthly contribution you need and how much of it comes from interest.
Open calculator →Term Deposit Calculator
A term deposit earns a fixed rate over a fixed period, but the interest is taxed. Use the simulator to see, in seconds, how much you actually receive (after the 28% withholding tax) at the end of the term.
Open calculator →Savings Certificates Calculator
Certificados de Aforro are the Portuguese State savings product: capital-guaranteed, with interest that compounds every quarter and a premium that grows the longer you hold. Use the calculator to estimate how much Série F earns (after the 28% withholding tax) over the years.
Open calculator →Inflation Calculator
Inflation steadily reduces what your money can buy. Use the calculator to see how much an amount will be worth, in purchasing power, a few years from now, and how much something you pay for today will cost in the future.
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About investment calculators
Investment calculators help you estimate how your money can grow over time, with interest, regular contributions and the effect of compounding. They are a starting point for understanding orders of magnitude, not guaranteed forecasts. Each calculator explains the formula it uses and links to the article that goes deeper.
Learn
- What is compound interest? →
- What is a term deposit? →
- What are savings certificates? →
- What is inflation? →
- How to build a savings plan? →
The calculators provide educational estimates and do not constitute financial advice.