Retirement Calculator
Project savings before retirement, then model withdrawals over the retirement duration you choose. Income is entered in today’s purchasing power; the model makes inflation, returns, contribution needs and any future income shortfall visible.
Your result
How the calculation works
An effective annual return R becomes a monthly rate (1 + R)^(1/12) − 1. Each saving month grows the opening balance, then adds the contribution. Required retirement savings are the discounted sum of your inflation-adjusted monthly withdrawals. Required monthly contribution solves the same accumulation model for that target. Retired withdrawals occur after each month’s growth.
Worked example
With $10,000 saved, ten saving years, zero returns/inflation and $100 contributed monthly, retirement savings reach $22,000. Funding $1,000 annually for twenty retirement years requires $20,000; the required saving contribution is $83.33 monthly, replacing the entered contribution.
Assumptions and limitations
Returns are smooth effective annual assumptions, not predictions. The pre-retirement and retirement rates can differ. Monthly saving contributions remain fixed. Retirement income rises once a year with inflation; no pension, social-security income, taxes, fees or inheritance is automatic. Enter only the income you want these savings to fund.
This is a projection, not investment advice or a safe-withdrawal guarantee. Negative returns are supported, but market sequence, longevity risk and changing income are not simulated. The shortfall can be negative, indicating modeled surplus. If retirement starts immediately, there are no remaining saving months in which to solve a contribution.
Sources and editorial responsibility
Maintained by Renvoro Pty Ltd. These mathematical estimates do not provide financial, tax, legal or investment advice.
Method reviewed 2026-10-08. Calculation standards · Report an issue