See how money grows with compound interest — in any currency, with optional monthly additions.
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Interest added
How to use the compound interest calculator
1Pick currency and amountAny currency; add a monthly contribution if you save regularly.
2Type rate and yearsAnd how often interest is added.
3See the resultFinal balance, total put in and interest earned.
Questions people ask
What is compound interest?
Interest earned on your interest. Each period, interest is added to the balance, so the next period’s interest is a little bigger.
What is the formula?
A = P × (1 + r/n)^(n × t), where P is the starting amount, r the yearly rate, n how many times a year interest is added, and t the years. Monthly additions are added at the end of each month.
Does more frequent compounding help?
A little. Daily compounding gives slightly more than yearly at the same rate — the rate itself and the time matter much more.