How to use this calculator
- Enter annual spending target, initial withdrawal assumption (%), current investable portfolio.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Assumptions and limitations
Inflation, tax, return sequencing, fees and future income are not modeled. Use consistent real or nominal amounts.
Worked example
With annual spending target = 30000, initial withdrawal assumption (%) = 4, current investable portfolio = 250000, portfolio target is approximately 750000.
What the result means
The withdrawal assumption is not a guarantee that a portfolio will last any particular period.
Common questions
How should I interpret portfolio target?
The withdrawal assumption is not a guarantee that a portfolio will last any particular period.
What should I check before using this result?
Inflation, tax, return sequencing, fees and future income are not modeled. Use consistent real or nominal amounts.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.