The How Long Will My Money Last Calculator tells you how many months or years your savings will last, based on a starting balance, regular withdrawals, and any growth the balance earns along the way. Simply fill in the fields above and click Calculate to get an instant result.
This calculator is part of Calculate Wiki’s Finance Calculators collection.
What You’ll Need
- Starting Balance
- Monthly Withdrawal
- Annual Growth Rate — optional, leave at 0 if your money isn’t invested
Formula Used
Months = −ln(1 − (r × Balance) ÷ Withdrawal) ÷ ln(1 + r), where r is the monthly growth rate
If Withdrawal ≤ Balance × r, the money lasts indefinitely.
Example Calculation
Using example inputs — Balance = $100,000; Monthly Withdrawal = $1,000; Growth = 4% — the How Long Will My Money Last Calculator returns:
| Value | Result |
|---|---|
| Months your money will last | 142 |
| Approx. years | 11.8 |
142 months (about 11.8 years).
Helpful Information
Results from the How Long Will My Money Last Calculator are estimates based on standard formulas used in the finance calculators field, assuming a constant growth rate and constant withdrawal amount. Real investment returns vary year to year — consider consulting a financial advisor for retirement or drawdown planning.