Sri Lanka Loan Calculator
Work out your instalment, the total interest you will pay, and how the balance falls over the life of the loan. Switch to vehicle leasing if you are financing a vehicle.
Generated 14 September 2026
Loan repayment summary
This is an estimate, not a tax assessment or a statement of what you owe. An indicative estimate only. Your actual position may differ — please confirm before relying on it.
Your details
Your results
Estimated monthly payment
LKR 0.00
Enter an amount, a rate and a term to see your payment.
An indicative estimate only. Your actual position may differ — please confirm before relying on it.
The facility
- Loan amount requested
- LKR 0.00
- Amount financed
- LKR 0.00
What it costs
- Principal repaid
- LKR 0.00
- Total interest
- LKR 0.00
- Total amount paid in instalments
- LKR 0.00
- Total cost of borrowing
- LKR 0.00
How we calculated this
The arithmetic behind your instalment, applied to the figures you entered.
1. The amount actually financed
The lender advances the loan amount less your down payment.
- Amount requested: LKR 0.00
- Down payment: − LKR 0.00
- Amount financed: LKR 0.00
2. Working out the instalment
On a reducing balance, the instalment comes from the standard annuity formula. Each payment covers the interest accrued on the outstanding balance since the last payment, and whatever is left reduces the principal. Early payments are mostly interest; later ones are mostly principal.
Rate per period: 0% ÷ 12 = 0%. Over 36 payments this gives an instalment of LKR 0.00.
3. The total you actually part with
- All instalments: LKR 0.00
- Of which interest: LKR 0.00
- Paid upfront: LKR 0.00
- Total: LKR 0.00
Calculation assumptions
Last updated: 2 September 2026
Where the rules leave room for interpretation, this is the position we took. Open any one to see the reasoning.
Loans are calculated on a reducing-balance basisYou can change this
The loan calculator uses the standard annuity formula, where interest each period is charged on the outstanding balance. Some Sri Lankan leasing products quote a flat rate instead, which produces a higher effective cost for the same headline rate — switch the interest basis if your quote uses a flat rate.
Fees are paid upfront unless you say otherwiseYou can change this
Processing, documentation and insurance fees are treated as paid at the start and are not added to the financed amount, unless you choose to capitalise them.
Save a copy
Produces a PDF of the result and its breakdown — just the figures, not the rest of the page.
Opens your browser’s print dialog — choose Save as PDF as the destination. On a phone, use Share → Print → Save as PDF.
Important — please read
Figures shown here are indicative estimates produced from the information you enter, and should be treated as a guide rather than a determination of what you owe or will receive. Rates, thresholds and rules change, individual circumstances vary widely, and no calculator can account for every factor that may apply to you. Calculate.lk is an independent service, is not affiliated with or endorsed by any government department or authority, and gives no warranty that any figure shown is accurate, complete or current. Before acting on anything here — filing, borrowing, negotiating a salary or planning around a number — confirm your position with a suitably qualified professional or the relevant authority.
Produced by Calculate.lk (https://calculate.lk). Calculate.lk is an independent service and is not affiliated with, endorsed by, or operated by any government department or authority. This document has no official status and should not be submitted as, or relied upon in place of, a return or assessment prepared by a qualified professional.
Frequently asked questions
How is a monthly loan payment calculated?
On a reducing-balance loan, the instalment is fixed by the annuity formula: the amount financed, the periodic interest rate and the number of payments determine a single payment that clears the loan exactly at the end of the term. Each payment covers the interest accrued on the outstanding balance first, and the remainder reduces the principal.
What is the difference between flat rate and reducing balance?
On a reducing balance, interest is charged only on what you still owe, so the interest portion falls as you repay. On a flat rate, interest is charged on the full original amount for the whole term, even though your balance is falling. A 10% flat rate typically costs close to 18–19% on a reducing balance, so the two cannot be compared directly. This calculator converts a flat quote into its reducing-balance equivalent so you can compare like with like.
Should I include processing fees in the loan?
Fees paid upfront cost you less overall than fees added to the amount financed, because financed fees attract interest for the whole term. The calculator treats fees as paid upfront by default and lets you switch, so you can see the difference on your own numbers.
Does a longer loan period reduce what I pay?
It reduces the monthly instalment but increases the total interest, because you are borrowing the money for longer. Compare the total repayment figure, not just the monthly payment, when choosing a term.
Is the rate my bank quotes the rate I actually pay?
Not necessarily. Banks and finance companies add processing, documentation, insurance and early-settlement charges that do not appear in the headline rate, and some quote flat rates rather than reducing-balance rates. Always ask for the written repayment schedule and compare the total amount payable.