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Kenya Loan Repayment Calculator

Calculate the monthly repayment and total interest on a personal or bank loan in Kenya over the full term.

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Written by PennyCompass Team

Monthly repayment and total interest on a loan.

Monthly repayment

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Total interest

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Total repayable

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Your breakdown

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ItemAmount

Worked example

Take a personal loan of KES 500,000 at 14% a year on a reducing balance, repaid over 36 months. The monthly rate is 14% divided by 12, about 1.1667%, and the amortisation formula fixes a level payment that clears the loan in exactly 36 instalments. That payment comes to KES 17,088.81 a month. Across 36 months you repay KES 615,197.34 in total, of which KES 500,000 is the principal and KES 115,197.34 is interest.

ItemValue
Loan amountKES 500,000
Annual rate14%
Term36 months
Monthly repaymentKES 17,088.81
Total interestKES 115,197.34
Total repaidKES 615,197.34

At 14% over three years the interest adds about 23% to what you borrowed. The chart below splits the total repaid into principal and interest.

How it is calculated

A reducing-balance loan uses the standard amortisation formula. The monthly payment equals the principal times the monthly rate times (1 plus the monthly rate) raised to the number of months, divided by that same power of (1 plus the monthly rate) minus one. The monthly rate is the annual rate divided by 12. Each month, interest is charged only on the balance still outstanding, so early payments are mostly interest and later ones are mostly principal. This is the method most Kenyan banks and SACCOs quote, and it gives a lower total cost than a flat-rate loan that charges interest on the full original amount for the whole term. If the rate is set to zero the tool falls back to a simple straight-line split of the principal across the months. Watch for arrangement fees, insurance, and excise duty on fees, which sit outside this calculation but add to the real cost of borrowing.

Frequently asked questions

How is a Kenyan loan repayment calculated?
Most bank and SACCO loans use the reducing-balance method, where interest each month is charged on the outstanding balance. The monthly repayment is fixed and is found from the loan amount, the monthly interest rate, and the number of months. Early on, more of each payment is interest; later, more is principal. Total interest is the sum of all repayments minus the amount you borrowed.
What is the difference between a reducing-balance loan and a flat-rate loan in Kenya?
A reducing-balance loan charges interest only on the outstanding principal each month, so the interest cost falls over time as you pay down the debt. A flat-rate loan charges interest on the full original amount for every month of the term, which makes it significantly more expensive for the same headline rate. Most Kenyan commercial banks and SACCOs quote reducing-balance rates, but some unsecured micro-lenders use flat rates, so confirm which method applies before comparing products.
How does the loan term affect total interest paid in Kenya?
Extending the term reduces the monthly repayment but increases total interest paid, because each extra month adds another round of interest charges on the outstanding balance. For example, on a KES 500,000 loan at 14% a year, stretching from 36 to 60 months cuts the monthly payment but can add tens of thousands of shillings to the total cost. Shortening the term does the opposite: higher monthly payments but lower total interest.
Are there other costs on a Kenyan bank loan beyond the interest rate?
Yes. Most Kenyan banks charge an arrangement or facility fee, and many require credit life insurance on personal loans, both of which add to the real cost of borrowing. Some lenders also levy excise duty on fees. None of these appear in this calculator, which shows only the reducing-balance principal and interest. When comparing loan offers, ask for the Annual Percentage Rate (APR) or the total cost of credit, which folds in all charges.

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Sources

  1. KRA — PAYE, NSSF and SHIF, Kenya Revenue Authority
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