Retirement Fund Needed Calculator (how much you need to retire)

How it works

Monthly gap = living costs − pensions and other income, in today’s money; it is grown by inflation until you retire: gap × (1 + i)^{years to retirement}. The fund you need is the present value, at the retirement-phase return r, of withdrawing that yearly gap at the start of every retirement year while it keeps rising with inflation i: Fund = G × [1 − ((1 + i) ÷ (1 + r))^L] ÷ (r − i) × (1 + r), where G is the first year’s gap and L the years in retirement (G × L when r = i). Your current savings grow at the pre-retirement return; the shortfall is spread over the months until retirement as a level monthly saving that earns the same return. Pensions are assumed to rise with inflation. Returns are assumed constant; real markets go up and down.

⚠ Estimates for information only — not financial advice.

FAQ

Until what age should I plan?

Plan past the average. Korea’s life expectancy at birth was 83.7 years in 2024 (Statistics Korea life tables), and people who already reached 60 live longer on average than newborns are expected to. Using 90 or 95 lowers the risk of running out.

What should I put as pensions?

Add the monthly amounts you expect from public, workplace and personal pensions plus steady income such as rent, all in today’s money. Your pension statement or the pension service’s online estimate gives the public pension figure.

Checked 11 Nov 2026. Present value of a growing annuity due and the sinking-fund payment, standard time-value-of-money relations (R. A. DeFusco et al., “Quantitative Investment Analysis”, CFA Institute / Wiley, reading “The Time Value of Money”). Korean life expectancy at birth 83.7 years (2024): Statistics Korea life tables via e-나라지표 indicator 2758.