Inflation Calculator - Purchasing Power | Financial Calculator

Free inflation calculator to see how purchasing power changes over time. Calculate future prices and the real value of your money after inflation.

Two sides of the same coin

Inflation can be read in either direction. Looking forward, prices rise: an item costing a fixed amount today will cost more later. Looking backward from that future date, money shrinks: a fixed sum of cash buys less. The calculator reports both — the future price multiplies by (1 + i)^years while the real value divides by the same factor — so the two figures are exact reciprocals of one another.

Worked example at a hypothetical rate

Take $1,000 with 3% annual inflation over 20 years. The future price of what $1,000 buys today rises to $1,806.11, while the real value of a $1,000 bill kept under the mattress falls to $553.68 — a purchasing power loss of $446.32, or 44.6%. The same arithmetic explains why long-term plans usually discount future amounts back into today's terms. Informational only.

How to Use

  1. Current Amount — Enter the present-day amount or asset value you want to evaluate, for example $1,000
  2. Annual Inflation Rate — Enter the assumed yearly inflation rate (%); long-run averages in many developed economies sit around 2–3%
  3. Period — Enter the number of years to project forward
  4. Calculate — Click Calculate to see the future price, the real value of today's money, and the purchasing power loss
  5. Compare the Two Outputs — Future price shows what today's item will cost; real value shows what today's cash will still buy
  6. Stress-Test Scenarios — Re-run at 2%, 3%, and 5% to bracket optimistic and pessimistic outcomes for long-range plans

FAQ

What is the average inflation rate in the US?

The US has averaged about 2–3% annual inflation over the past decade. During 2021–2023, it surged above 7%. For long-term planning, 2.5–3% is a conservative benchmark.

What happens if my investment return is lower than inflation?

Your real purchasing power decreases. For example, if savings earn 2% but inflation is 3%, you're effectively losing 1% in real terms each year.

How do I factor inflation into retirement savings?

Calculate future monthly needs by multiplying current expenses by (1 + inflation rate)^years. Example: $2,000/month × (1.025)^20 ≈ $3,277 needed 20 years from now.

What formulas drive the results?

Future price = amount × (1 + i)^years and real value = amount ÷ (1 + i)^years, where i is the annual inflation rate. Purchasing power loss is the difference between the original amount and its real value, also shown as a percentage.

Why isn't the loss simply the rate times the years?

Because inflation compounds. At 3% for 20 years the loss is 44.6%, not 60%: each year erodes 3% of an already-reduced base, so the remaining purchasing power equals 1 ÷ 1.03^20 ≈ 55.4% of the original.

Is the same rate applied every year?

Yes — the model compounds one constant annual rate. Real inflation varies year to year and by country, so treat the output as a planning scenario rather than a forecast, and test several rates.