Set your inputs and units
Enter amounts in THB and choose a period and rate basis that match the scenario you want to model.
Simple interest
Calculate simple interest from principal, an annual rate and a period with explicit day-count assumptions.
Calculation result
Adjust the example inputs, then calculate to see your result.
Interest = principal × annual rate × year fraction. No compounding, tax or fees. Results round to two decimals, half up.
How to use this calculator
Check the assumptions
Review contribution timing, day-count basis or reserve duration. Financial products do not all use the same rules.
Calculate and compare
Read the result and table, then change inputs to compare. Copy the result or reset without leaving this page.
A worked example
Illustrative calculation
10,000 THB at 5% annual simple interest for one year earns 500 THB, for a total of 10,500 THB.
Compare a second scenario
Copy your first result, then change only the amount or duration to see how that assumption changes the outcome.
Common questions
Where does my information go?
Calculations run in your browser. Financial inputs are neither saved locally nor sent to analytics. Reloading restores the initial values.
Does this match a bank statement or guarantee a return?
This is an estimate under your assumptions, not a guaranteed return. Actual payment dates, fees, taxes and contractual rounding can change the result.