Investment Calculator

Estimate how much an investment may grow, how much to contribute monthly for a target, or how long it may take to reach it.

How the investment calculator works

The calculator converts the rate you enter into an equivalent monthly rate and applies the future-value formula with starting amount and fixed monthly contributions.

You can project a balance, solve the monthly contribution needed for a target, or estimate the first month when the target would be reached.

Projection, required contribution, and time to goal

In projection mode, the term is fixed and the result is the estimated balance. In contribution mode, the target and term are fixed and the calculator solves the monthly amount.

In time-to-goal mode, the tool searches month by month up to 600 months. If the assumptions are not enough, it shows an unreachable-goal alert.

Effective annual or monthly rate

When you enter an effective annual rate, conversion uses the 12-period root. A monthly rate is applied directly each month and converted to an equivalent annual rate.

What is not included

The estimate does not include taxes, IOF, fees, guarantees, liquidity, mark-to-market effects, credit risk, quotes, dividends, or actual asset variation.

Formula sources

The formulas were revalidated on 2026-06-26. Banco Central is an official context reference; no market rate is imported.

Microsoft FVMicrosoft PMTMicrosoft NPERMicrosoft EFFECTBanco Central

Related calculators

Use specific tools when you need taxes, products, or more detailed cash flows.

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Important notice

This calculator is an educational estimate, not investment, accounting, tax, or legal advice. It does not recommend any product, broker, issuer, or asset class and does not guarantee future returns.

Frequently asked questions

Is the return rate updated automatically?
No. The rate is always an assumption you enter. The tool does not fetch CDI, Selic, IPCA, stocks, funds, crypto, or any quote.
Does it include income tax, IOF, or fees?
No. The calculation is gross and does not include taxes, management fees, performance fees, custody, spreads, brokerage, or other costs.
What is the difference between annual and monthly rate?
The effective annual rate is converted into an equivalent monthly rate. The monthly rate you enter is applied directly to each month and also converted to annual equivalent.
Why does beginning-of-month contribution change the result?
Because a contribution made at the beginning of the month earns return during that month. At the end of the month, it starts earning in the next period.
Can I use it for CDBs, Treasuries, stocks, or funds?
You can use it as a gross constant-return scenario, but those products have taxes, fees, risks, and behavior this calculator does not model.
Does the result guarantee future returns?
No. The rate is only a hypothesis. Real results depend on markets, inflation, taxes, fees, risks, and asset behavior.