Simple interest calculator
See how much an amount earns with simple interest, adding deposits every month. Compare it right away with what compound interest would give you.
Enter a term and a starting amount or monthly deposit greater than zero.
This is an estimate for information only. It is not a credit offer or an investment recommendation: check the terms with the institution before you decide.
How we calculate
With simple interest, each amount invested earns the same sum every month, calculated on itself. Monthly deposits start earning the month after they go in.
i = monthly rate (yearly rate ÷ 12) · n = months. For comparison, we also calculate the same scenario with compound interest.
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How is it different from compound interest?
With compound interest, each month’s interest starts earning too. Over long periods the difference gets big.
Where is simple interest used?
In some short-term loans, late fees and penalties. Most investments use compound interest.
Can I use only years or only months?
Yes. Fill in one field and leave the other at 0.