Retirement Calculator
Project your 401(k) or UK pension to retirement in today's money, with your employer's contributions, Social Security or State Pension, and the gap.
How to Use Retirement Calculator
- 1Choose where you'll retire: the United States (401(k), IRA and Social Security), the United Kingdom (workplace pension, SIPP and State Pension) or elsewhere.
- 2Enter your age, the age you want to retire, your pay and what you've saved so far.
- 3Add what you pay in as a percentage of pay and your employer's contribution: in the US the match rate and the pay it applies to, in the UK the employer's percentage, on qualifying earnings or all pay.
- 4Add any other monthly saving, your expected Social Security or State Pension, and the yearly income you'd like in retirement.
- 5Adjust the investment return, inflation, pay rises and withdrawal rate if you like, then read your pot in today's money, the income it could pay, and how much more to save each month to reach your target.
Frequently Asked Questions
How much will my 401(k) be worth when I retire?
It depends on what goes in and how it grows. A 35-year-old earning $75,000 who puts in 6%, with a 50% employer match on up to 6% of pay, $30,000 already saved, 3% pay rises and a 6% return, would have about $1.09 million at 67. That's about $495,000 in today's money with 2.5% inflation, enough to draw about $19,800 a year at 4%, before Social Security.
How much do I need to retire?
A common rule of thumb is 70–80% of your pay before retiring. The 4% rule turns that into a savings target: to draw $30,000 a year from savings, you'd need about 25 times that, $750,000 in today's money, on top of Social Security or a State Pension. The calculator works out the gap and the monthly saving that closes it.
What is the 401(k) contribution limit for 2026?
$24,500 of your own contributions. From age 50 you can add a catch-up of $8,000 ($32,500 in total), or $11,250 at ages 60 to 63 ($35,750). Employer contributions don't count towards your limit. The IRA limit is $7,500, or $8,600 from 50. From 2026, if you earned over $150,000 in FICA wages the year before, catch-up contributions must go in as Roth.
Is the employer match worth it?
It's usually the best return you'll get: a 50% match on 6% of a $75,000 salary adds $2,250 a year for the $4,500 you put in. In the example above the employer adds about $118,000 over 32 years before growth. Check your plan's vesting schedule, since some matches only become yours after a few years.
How much is the UK State Pension?
The full new State Pension is £241.30 a week (about £12,548 a year) in 2026/27 with 35 qualifying years of National Insurance; you need 10 years to get any. State Pension age is 66, rising to 67 between 2026 and 2028, and is due to rise to 68 later under current law. Your forecast on GOV.UK shows your own amount.
Will my UK workplace pension be enough?
On the auto-enrolment minimum it may not be. Someone aged 35 on £35,000, paying 5% with 3% from their employer on qualifying earnings, with £20,000 saved and a 6% return, would have about £196,000 in today's money at 68. At 4% that's about £7,850 a year, or £20,395 with the full State Pension. Reaching £24,500 a year would take about £193 more a month.
About Retirement Calculator
This retirement calculator projects your savings to the day you retire, in today's money, and shows the income they could pay alongside Social Security or the State Pension. In the US it models a 401(k) with your employer's match, capped at the 2026 limits including catch-up contributions, plus an IRA or other saving. In the UK it models a workplace pension with tax relief, on qualifying earnings or all pay, plus a SIPP or ISA.
It grows the pot month by month with pay rises, shows the split between your contributions, your employer's and investment growth, and works out the extra monthly saving that would close any gap to the income you want, using a withdrawal rate you choose.
Projections depend on returns that aren't guaranteed. Figures and limits are checked against the IRS, GOV.UK and The Pensions Regulator and dated on the page.