Set the inputs
Enter months until retirement, retirement months in the plan and current savings to separate accumulation from withdrawals.
Retirement savings
Plan retirement savings in today’s or future money with inflation, retirement income and an explicit terminal reserve.
Scenario result
Enter your assumptions and calculate the scenario.
Calculations retain decimal precision and display two decimals; rounded rows can differ slightly from totals. This model does not guarantee profit, a probability of success, or lifetime funding.
How to use this calculator
Check the terms
Enter expenses and the terminal reserve in today’s purchasing power. Set inflation and the retirement income basis, then choose output units.
Read the result
Read the target at retirement and required monthly savings, then test a longer life or lower returns.
A worked example
Illustrative calculation
Spending 20,000 THB for 240 retirement months with no income, return or inflation requires 4,800,000 THB before a terminal reserve.
Compare a second scenario
Reduce months until retirement while keeping retirement duration and the target fixed. Inspect the higher monthly contribution without shortening withdrawals.
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?
Market return sequences and all emergencies are not modeled. The projection does not guarantee lifelong funding.