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Compound Interest Calculator Kenya — Watch Your Money Grow

Enter your principal, choose a compounding frequency, and see how interest on interest accelerates your wealth in money market funds, unit trusts, SACCOs and more.

Compound interest in Kenya is calculated as A = P(1 + r/n)nt, where your interest earns interest every compounding period. Most Kenyan money market funds compound daily, turning KES 100,000 at 9% into approximately KES 119,722 after just 2 years — compared to KES 118,000 with simple interest. Over 10 years, that same amount grows to KES 246,077 with daily compounding. Interest income is subject to 15% withholding tax (WHT), except for Treasury Bills which are tax-exempt for individuals. Use the calculator below to see your exact projected returns.
Calculator 2 of 12

The Power of Compounding

Watch your interest earn interest — and see how much extra it creates.

Serrari provides educational tools — we are not financial advisors. Results are estimates based on the inputs you provide.

Calculator 02
Compound Interest Calculator
When your interest earns interest, your money grows faster than you think.
1
2
3
How much are you starting with?
This is your principal — the starting amount that will grow.
KES
What rate, and how often does it compound?
The interest rate is your annual return. Compounding frequency tells you how often your interest earns interest.
%
MMF average is around 9–11%

Total value with compounding
0
You put in
0
Interest earned
0
With simple interest
0
Extra from compounding
0
💡
The power of compounding
⚡
Daily compounding advantage
MMFs compound daily, which is why they beat monthly or annual rates. Each day, your interest earns a tiny bit more interest — it all adds up over months and years.

Compound Interest Formula — How It Works

A = P(1 + r/n)nt
A
Final Amount
P
Principal
r
Annual Rate
n
Compounds/Year
t
Time (years)

Example: You invest KES 100,000 in a Kenyan money market fund at 9.4% compounded daily for 5 years. Your final amount is 100,000 × (1 + 0.094/365)365×5 = KES 159,564. Interest earned is KES 59,564 — compared to KES 47,000 from simple interest. That extra KES 12,564 came from your interest earning interest.

The more frequently interest compounds, the faster your money grows. Daily compounding (n=365) beats annual compounding (n=1) because interest is reinvested every single day. This is why Kenyan money market funds, which compound daily, produce higher returns than fixed deposits which typically use simple interest.

Where to Earn Compound Interest in Kenya — 2026

Products that compound your returns. Rates updated daily on Serrari.

Product Typical Rate Compounding Tax on Interest Liquidity
Money Market Funds 9 – 12% EAR Daily 15% WHT T+1 to T+3
Unit Trusts (Equity) 8 – 18% (variable) Monthly / Quarterly 15% WHT on income T+3 to T+5
SACCO Savings 8 – 14% Monthly / Annually 15% WHT Varies by SACCO
Fixed Deposits (reinvested) 8 – 13% At maturity (rollover) 15% WHT At maturity
Treasury Bonds (reinvested) 12 – 16% YTM Semi-annual coupons 10% WHT Secondary market
Compare All 163+ Products on Serrari Marketplace →

Compound Interest vs Simple Interest — Kenya Comparison

See why compounding is the single most important factor in long-term wealth building.

Factor Compound Interest Simple Interest
Formula A = P(1 + r/n)nt I = P × R × T
Interest earned on Principal + accumulated interest Original principal only
KES 100K at 10% for 5 years KES 161,051 total (KES 61,051 interest) KES 150,000 total (KES 50,000 interest)
KES 100K at 10% for 20 years KES 672,750 total KES 300,000 total
Kenya products MMFs, Unit Trusts, SACCOs FDs, T-Bills, Bonds
Best for Long-term wealth building Short-term, predictable returns

Need to calculate simple interest instead? Try the Simple Interest Calculator

Compound Interest Calculator Kenya — FAQ

What is compound interest?+
Compound interest is interest calculated on both your principal and previously earned interest. The formula is A = P(1 + r/n)nt. In Kenya, most money market funds compound daily. For example, KES 100,000 at 9% compounded daily grows to approximately KES 246,077 in 10 years — without adding a single shilling more.
What is the compound interest formula?+
The formula is A = P(1 + r/n)nt where A = final amount, P = principal, r = annual rate (as a decimal), n = number of times interest compounds per year, t = time in years. For daily compounding (most MMFs), n = 365. Example: KES 100,000 at 9.4% daily for 5 years = 100,000 × (1 + 0.094/365)1825 = KES 159,564.
What is the best compound interest investment in Kenya?+
Money market funds are the best compound interest investment for most Kenyan investors. They compound daily, are regulated by the CMA, and offer near-instant liquidity (T+1 to T+3). Unit trusts also compound returns but carry more risk. Compare all options on the Serrari Marketplace.
How long does it take to double my money in Kenya?+
Use the Rule of 72: divide 72 by your annual interest rate. At an MMF average of 9%: 72 ÷ 9 ≈ 8 years. At a top MMF rate of 11.5%: ≈ 6.3 years. For government bonds at 13% YTM: ≈ 5.5 years. The higher the rate and more frequent the compounding, the faster your money doubles.
How is compound interest taxed in Kenya?+
Interest income from MMFs, unit trusts, and bank savings is subject to 15% withholding tax (WHT). If your MMF earns KES 10,000 in interest, KRA deducts KES 1,500. The exceptions: Treasury Bills are tax-exempt for individuals. T-Bonds are taxed at 10% WHT. Infrastructure bonds are fully tax-exempt.
What is the difference between compound and simple interest?+
Simple interest is calculated only on the original principal (I = P × R × T). Compound interest is calculated on principal plus accumulated interest. Over long periods, the difference is dramatic: KES 100,000 at 10% for 20 years earns KES 200,000 simple interest vs KES 572,750 compound interest — nearly 3x more. Try the simple interest calculator to compare.

More Financial Calculators

12 free tools to help you make smarter investment decisions in Kenya.

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Simple Interest
Calculate flat-rate returns
📈
Compound Interest
You are here
⏱️
Rule of 72
How fast does your money double?
🎯
Savings Goal
Monthly amount to hit your target
🏝️
Financial Freedom
When can you stop working?
🏠
Home Loan
Monthly mortgage repayment
📉
Inflation
What will your money be worth?
💱
Currency Converter
KES to USD and more
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Serrari Markets provides independent financial data and educational tools. We are not licensed by the Capital Markets Authority (CMA), are not financial advisors, and do not manage funds or hold deposits. Calculator results are estimates for educational purposes. Always consult a licensed advisor before making investment decisions.
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