Set the inputs
Enter initial principal, annual rate, duration and monthly additions for the compound-growth plan.
Compound interest
Project compound growth with monthly contributions, contribution timing and a month-by-month table.
Calculation result
Adjust the example inputs, then calculate to see your result.
The chosen annual rate is converted to equivalent monthly growth. Constant rate; no tax, fees or inflation. Calculations retain precision before display rounding to two decimals, half up, so displayed rows may differ slightly from totals. Goal contributions round up to cents. Returns are not guaranteed.
How to use this calculator
Check the terms
Select compounding frequency, rate basis and beginning- or end-of-month contributions. Keep nominal and effective rates distinct.
Read the result
Read the growth schedule and separate contributions from interest. Total savings are not all profit.
A worked example
Illustrative calculation
10,000 THB initially plus 1,000 THB at each month-end for 12 months at 0% gives 22,000 THB.
Compare a second scenario
Hold the rate and contributions fixed and switch beginning to end of month to compare time earning interest.
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.
What are this model’s limitations?
Rates and compounding are modeled assumptions, not guaranteed results or a reproduction of account-specific credit dates and taxes.