Calculate what a purchase will cost after inflation, what your money will still buy, and your real return after inflation.
업데이트 검증한 예제: 4
At 3% inflation, what costs $1,000.00 today costs $1,343.92 in 10 years, and $1,000.00 kept as cash buys only $744.09 worth of today's goods. Earning 6% beats inflation: the real return is 2.913% a year.
| 년 | Cost of the purchase | Buying power of the amount | Savings (nominal) | Savings (today's money) |
|---|---|---|---|---|
| 1 | $1,030.00 | $970.87 | $1,060.00 | $1,029.13 |
| 2 | $1,060.90 | $942.60 | $1,123.60 | $1,059.10 |
| 3 | $1,092.73 | $915.14 | $1,191.02 | $1,089.95 |
| 4 | $1,125.51 | $888.49 | $1,262.48 | $1,121.69 |
| 5 | $1,159.27 | $862.61 | $1,338.23 | $1,154.37 |
| 6 | $1,194.05 | $837.48 | $1,418.52 | $1,187.99 |
| 7 | $1,229.87 | $813.09 | $1,503.63 | $1,222.59 |
| 8 | $1,266.77 | $789.41 | $1,593.85 | $1,258.20 |
| 9 | $1,304.77 | $766.42 | $1,689.48 | $1,294.84 |
| 10 | $1,343.92 | $744.09 | $1,790.85 | $1,332.56 |
The exact Fisher relation; the shortcut nominal − inflation overstates the real rate slightly.
Inflation raises prices by a percentage each year, and it compounds like interest. At a steady rate π, a purchase costing A today costs A(1 + π)^n after n years, and cash held for n years buys only A ÷ (1 + π)^n of today's goods. The real return on savings follows Irving Fisher's relation: (1 + nominal rate) ÷ (1 + inflation) − 1.
With the defaults, 1,000 and 3% inflation for 10 years, the same purchase will cost 1,343.92 and cash of 1,000 will buy 744.09 of today's goods, a 25.59% loss of purchasing power. Savings earning 6% have a real return of 2.9126% a year, not 3%, and grow to 1,332.56 in today's money.
The inflation rate is held constant. Official price indices such as the US CPI-U move unevenly and differ by basket and country, so for past prices use the index values themselves, for example through the BLS CPI inflation calculator.
검증 출처: Python decimal: 1000·1.03^10 = 1343.9164; 1000/1.03^10 = 744.0939; 1.06/1.03 − 1 = 2.912621 %
검증 출처: With π = 0 the real rate equals the nominal rate; 1000·1.06^10 = 1790.8477 (Python decimal)
검증 출처: Python decimal: 100·0.98^5 = 90.3921; 100/0.98^5 = 110.6292; 1.01/0.98 − 1 = 3.0612 %
검증 출처: Python decimal: 50000·1.065^20 = 176182.2532; 1.08/1.065 − 1 = 1.40845 %
Multiply today's price by (1 + inflation rate) raised to the number of years. At 3% a year, something costing 1,000 today costs 1,000 × 1.03^10 = 1,343.92 in 10 years, a total price rise of 34.39%. At 3.4% a year it would cost 1,397.03.
Divide (1 + nominal return) by (1 + inflation) and subtract 1, the Fisher relation. Savings earning 6% while prices rise 3% have a real return of 1.06 ÷ 1.03 − 1 = 2.9126% a year. The shortcut 6% − 3% = 3% overstates it slightly, and the gap grows with higher rates.
US consumer prices (CPI-U) rose 3.4% in the 12 months to August 2026, and 2.4% excluding food and energy, according to the Bureau of Labor Statistics. The Federal Reserve's target is 2% a year, measured by the PCE price index rather than the CPI; the Bank of England and the European Central Bank also target 2%.
ln 2 ÷ ln(1 + inflation rate) years. At 2% inflation cash loses half its purchasing power in 35.0 years, at 3% in 23.4 years and at 3.4% in 20.7 years. Even at a 2% target rate, 1,000 held as cash for 10 years loses 17.97% of what it can buy.
정확도는 입력값과 계산 방법의 가정에 따라 달라집니다. 십진 연산은 유효숫자 50자리를 사용하지만, 추정값·수치해석 방법·원본 데이터의 정밀도는 더 낮을 수 있습니다. 표시값을 반올림해도 이러한 한계는 사라지지 않습니다. 독립적인 출처의 풀이와 대조한 계산 예시: 4. 예를 들어 “1,000 at 3% inflation for 10 years, savings at 6%”은 Python decimal: 1000·1.03^10 = 1343.9164; 1000/1.03^10 = 744.0939; 1.06/1.03 − 1 = 2.912621 %와 대조해 확인합니다.
U.S. Bureau of Labor Statistics — CPI inflation calculator; Fisher, I. — The Theory of Interest (1930), real vs nominal rates.
계획을 위한 참고용입니다. 대출기관, 세무당국과 시장은 자체 반올림 방식, 수수료와 규칙을 적용합니다. 계약 등의 결정을 내리기 전에 해당 기관에 수치를 확인하세요.
이 계산기에는 독립적인 출처에서 답을 얻은 계산 예제가 4개 있습니다. 테스트 모음에서 실행되며 여기에서도 실행할 수 있습니다.
Calculate how much you need to retire on inflation-adjusted expenses, the monthly saving that gets you there, and how the money runs down.
초기 예금과 정기 납입금의 미래 가치를 계산합니다. 일 복리와 연속 복리를 포함한 모든 복리 주기를 지원합니다.
Solve for the future value, present value, interest rate or time of a lump sum from the other three, with any compounding, including continuous.
Calculate ROI (total return) and CAGR (compound annual growth rate) from an investment's start and end values, over years or between two dates.
Calculate simple interest (I = P × r × t) and the maturity amount on a principal for a term in years, months or days.
뮤추얼 펀드 월 적립 투자(SIP)의 만기 가치를 추정합니다. 연간 납입액 증액을 선택하거나 목표 달성에 필요한 적립액을 계산할 수 있습니다.