Compound interest calculator

The compound interest calculator shows how much an initial amount and monthly contributions grow with interest on interest. Enter the rate per month or per year and the term to see the final balance, the interest earned, the comparison with simple interest and the year by year table. R$ 10,000 at 1% per month becomes R$ 11,268.25 in 12 months.

Processed in your browser

Initial amount (R$)Monthly contribution (R$)

Fill in at least one of the two. The contribution is added at the end of each month.

Interest rate (%) · required

Effective rate, as banks and the Treasury publish it.Term · required

Deduct (optional)Brazilian income tax on fixed income (CDB, Tesouro)Regressive table, from 22.5% to 15%, by how long each contribution stays invested. LCI, LCA and savings are exempt.Inflation per year (%)Shows what the final amount buys in today's money.