See how inflation erodes purchasing power over time. Calculate the real value of money.
How purchasing power changes over time
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Inflation is often called a "silent tax" because it reduces purchasing power without ever showing up as a line item on a bill. Money sitting in a checking account earning 0.1% interest while inflation runs at 3% loses roughly 2.9% of its real value every single year.
Over a decade, even modest inflation compounds dramatically. At 3% annual inflation, prices roughly double every 24 years (following the Rule of 72: 72 ÷ 3 = 24). That means a retirement plan built on today's costs will badly undershoot the actual costs you'll face in 20-30 years if inflation isn't factored in.
This is why "safe" cash savings aren't actually safe long-term. An emergency fund should stay liquid in cash, but money you don't need for 5+ years loses real value sitting uninvested. Historically, stock market returns have outpaced inflation by 5-7% annually, which is the core argument for long-term investing over cash savings.
Use the calculator above to see how much purchasing power a fixed amount loses over different time horizons — it's a sobering but useful exercise for retirement and long-term financial planning.