Inflation & Future Value
Future value adjusted for inflation.
Future real value (today's purchasing power)
7,440,939원
Future real value shows today's purchasing power in the future; nominal amount needed is what you'd need to keep today's purchasing power. (Estimate only)
Real value vs. nominal amount needed
As prices rise, the same amount of money buys less. Future real value shows how much purchasing power today's money will have at a future date, while future nominal amount needed shows how much money you'd need in the future to keep today's purchasing power.
How it's calculated
With current amount PV, annual inflation rate r(%), and term n (years): future real value = PV ÷ (1+r/100)ⁿ; future nominal amount needed = PV × (1+r/100)ⁿ. The gap between the two widens with a higher rate or a longer term.
What inflation rate should I use
Korea's recent consumer price inflation has hovered around 2-3% annually, though it varies year to year. For long-term planning like retirement or education funds, it's recommended to compare several scenarios (e.g. 2%, 3%, 4%).
Estimating the halving point with the Rule of 72
The Rule of 72 is a rough way to estimate how long it takes a compounding value to double or halve: divide 72 by the annual rate. At 3% annual inflation, 72 ÷ 3 = about 24 years for today's purchasing power to fall to roughly half.
Checking against the calculator's exact formula (future real value = PV ÷ (1+r/100)ⁿ), real value actually halves at about 23.4 years for 3% inflation ((1.03)^23.4 ≈ 2) — within about 0.6 years of the Rule of 72's estimate, which is a reasonably close approximation. It's still just an estimate, though, so always rely on the calculator's exact formula for precise figures.
The halving point shifts with the rate. At 2% inflation, the Rule of 72 gives 72÷2=36 years, versus about 35.0 years from the exact formula — again a close match. At a higher 6% rate, 72÷6=12 years versus about 11.9 years exactly — the halving period shrinks sharply. The higher the inflation rate, the faster real purchasing power erodes.
Nominal vs. real return matters too. The "interest rate" quoted on deposits or investments is nominal; subtracting inflation gives an approximate real return (real rate ≈ nominal rate − inflation rate, the Fisher-equation approximation). For example, a 4% deposit rate with 3% inflation leaves only about 1% real return. A positive nominal rate that's still below inflation can mean shrinking real purchasing power — so plan around real, not nominal, returns.