Compound Interest Calculator: See How Your Savings Grow
Enter a starting amount, a monthly top-up, an interest rate and a number of years to see how your money grows when your interest starts earning interest too.
Rates checked 25 Sept 2026 against official sources (listed below).
Balance after 10 years
KES 1,159,577
You put in
KES 650,000
Earnings (after tax)
KES 509,577
| Year | Balance |
|---|---|
| Year 1 | KES 118,063 |
| Year 2 | KES 193,254 |
| Year 3 | KES 276,318 |
| Year 4 | KES 368,080 |
| Year 5 | KES 469,451 |
| Year 6 | KES 581,436 |
| Year 7 | KES 705,148 |
| Year 8 | KES 841,814 |
| Year 9 | KES 992,791 |
| Year 10 | KES 1,159,577 |
Interest is compounded monthly and top-ups are added at the end of each month. No tax is deducted; if your savings product withholds tax on interest (for example 15% on money market funds in Kenya), use the money market fund calculator instead.
About this calculator
It works in any currency: the figures show in shillings, but the maths is the same for naira, cedis or rand.
Why compounding matters
With simple interest you earn only on what you put in. With compound interest, each month's interest is added to the balance and starts earning too. Over long periods, the difference is large: KES 5,000 a month at 10% for 10 years grows to about KES 1.16 million from KES 650,000 of your own money (including the KES 50,000 you start with).
Frequently asked questions
What is compound interest?
Interest calculated on your deposits plus the interest already earned, so your balance grows faster the longer you leave it.
How often is interest compounded?
It depends on the product. Money market funds usually accrue daily, bank fixed deposits often monthly or at maturity, and SACCOs pay dividends once a year.
Does this include tax?
No. Many savings products deduct tax on interest, which lowers the final balance.