Retirement has two phases
Most retirement calculators model only the first phase and stop at the nest-egg figure. That is the easy half. The question that actually matters is whether the money outlasts you.
Accumulation
From today until you retire, contributions compound. Time is the dominant variable — someone saving $500 a month from 25 retires with far more than someone saving $1,000 from 45, despite contributing less in total.
Drawdown
From retirement onward, you withdraw while the remaining balance still earns a return. Withdrawals rise with inflation, since your costs do. The balance can grow for years before it starts falling.
Contributions were $210,000 — so 77% of the final figure is growth. In today's money at 2.5% inflation, that pot is worth about $379,449.
The 4% rule and its limits
The 4% rule comes from the 1998 Trinity Study, which tested historical US market data and found that withdrawing 4% of the initial balance in year one, then adjusting that amount for inflation each year, survived every 30-year window tested.
Nest egg needed = Desired income ÷ 4%
The second form is the useful one. To generate $50,000 a year, you need $1.25 million. To generate $80,000, you need $2 million.
| Annual income | At 3% | At 4% | At 5% |
|---|---|---|---|
| $30,000 | $1,000,000 | $750,000 | $600,000 |
| $50,000 | $1,666,667 | $1,250,000 | $1,000,000 |
| $75,000 | $2,500,000 | $1,875,000 | $1,500,000 |
| $100,000 | $3,333,333 | $2,500,000 | $2,000,000 |
How much you need
A common heuristic is that you need 70% to 80% of pre-retirement income, on the basis that some costs fall — commuting, retirement contributions themselves, often a paid-off mortgage — while healthcare typically rises.
| Age | Saved |
|---|---|
| 30 | 1× salary |
| 35 | 2× |
| 40 | 3× |
| 45 | 4× |
| 50 | 6× |
| 55 | 7× |
| 60 | 8× |
| 67 | 10× |
These are guidelines, not requirements, and they assume retirement at 67 with roughly 45% of income replaced by savings and the rest by social security or a state pension. Adjust for your own situation.
Why starting early beats saving more
| Starts at | Total contributed | Nest egg at 65 |
|---|---|---|
| Age 25 | $240,000 | $1,312,407 |
| Age 30 | $210,000 | $900,527 |
| Age 35 | $180,000 | $609,985 |
| Age 40 | $150,000 | $405,036 |
| Age 45 | $120,000 | $260,463 |
Starting at 25 rather than 35 costs an extra $60,000 in contributions and produces $702,000 more. The ten years at the start are worth more than everything that follows.
Where to save
- Employer match first, always. A 50% match on the first 6% of salary is an immediate 50% return. Nothing else comes close.
- Tax-advantaged accounts next. 401(k) and IRA in the US, ISA and pension in the UK, EPF and NPS in India, RRSP and TFSA in Canada.
- Taxable accounts after that, once the tax-advantaged limits are used.
- Keep costs low. A 1% fee over 35 years can consume a quarter of the final balance.
For the Indian equivalents, see the NPS calculator and the PPF calculator. For general portfolio projection, the investment calculator.
Frequently asked questions
How much do I need to retire?
Divide your target annual income by your withdrawal rate. At 4%, generating $50,000 a year needs $1.25 million; at a more conservative 3.5%, about $1.43 million.
Subtract any state pension or social security first — you only need savings to cover the gap.
Is the 4% rule still reliable?
It remains a reasonable planning anchor but is not a guarantee. It was derived from US historical data over 30-year windows and assumes a stock-heavy portfolio.
For longer retirements or lower expected returns, many planners now suggest 3.25% to 3.5%. Flexibility — cutting withdrawals in bad years — matters more than the exact starting number.
What if I start saving late?
Save more, work longer, or both. Each extra year of work helps twice: one more year of contributions and growth, and one fewer year of withdrawals.
Catch-up contributions are available in most systems from age 50, allowing higher annual limits.
Should I include social security or a state pension?
Yes, but conservatively. Estimate the benefit, subtract it from your target income, and size the nest egg to cover only the remainder.
Many planners assume 70% to 80% of the projected benefit for those still decades from retirement, to allow for policy changes.
What return should I assume in retirement?
Lower than during accumulation, because portfolios typically shift toward bonds. If you assume 7% while working, 4% to 5% in retirement is a common pairing.
The calculator lets you set both separately for exactly this reason.