How this calculator works
- Enter the deposit amount, choose the tenure, and decide whether to apply withholding tax.
- The calculator estimates profit and maturity value using the listed bank rates for the selected period.
- Below the calculator, the full rate table still shows all tracked banks across common fixed-deposit tenures.
Worked example
For LKR 1,000,000.00 over 12 months, the page estimates the maturity value and compares the bank rates for the same tenure.
Important assumptions
- This version uses the published bank-rate table captured from the referenced public comparison flow rather than live bank APIs.
- Interest is estimated using simple proportional annual interest for the selected tenure.
- If withholding tax is enabled, it is deducted from interest income using the selected rate, which defaults to 5%.
- The all-bank table below shows the lower listed rate when a bank publishes both maturity and monthly-interest options for the same tenure.
FAQ
Are these calculators free?
Yes. lankacalculator tools are free to use and designed to be quick to access without sign-up.
How accurate are the results?
The calculators use clear assumptions and formulas, but results are estimates and should be checked against official documents or provider terms.
Can I use this on mobile?
Yes. The layout is built to work cleanly on phones, tablets, and desktops.
Do you store my inputs?
No account is required for these tools, and calculator inputs are not stored as user profiles in this v1 setup.