Inflation & Purchasing Power Calculator
Calculate how much purchasing power your cash loses over 5, 10, 20, or 30 years due to compound inflation. Compare idle cash in checking against High-Yield Savings Accounts and diversified equity index funds.
Purchasing Power Decay
Calculates exact percentage and real dollar losses from holding uninvested cash.
Future Equivalent Cost
Determines how much nominal money is required in the future to purchase today's basket.
Asset Class Benchmarking
Side-by-side comparison of idle bank cash, High-Yield Savings, and Global Equities.
Inflation & Purchasing Power Erosion Simulator
Model compound purchasing power decay and compare idle cash against High-Yield Savings and diversified equity compounding.
Proportion of your real wealth destroyed over 15 years by holding idle cash.
What your $50,000 cash will actually buy in 15 years.
Amount needed in 15 years to purchase today's $50,000 basket.
Outpaces inflation by generating real positive purchasing power.
The Cost of Inaction: Asset Class Trajectory Over 15 Years
Quietly loses purchasing power every single day due to uncompensated inflation decay.
Effectively protects cash from baseline decay, ideal for 3-12 month emergency funds.
Productive enterprise ownership generates true compounding above macroeconomic inflation.
Multi-Year Purchasing Power Breakdown
Year-by-year trajectory of cost escalation vs purchasing power drawdown.
| Year | Future Equivalent Cost | Real Value of Cash | HYSA Value | Index Funds | Power Lost |
|---|---|---|---|---|---|
| 2027 | $51,600 | $48,450 | $52,250 | $54,250 | -3.1% |
| 2028 | $53,251 | $46,947 | $54,601 | $58,861 | -6.1% |
| 2029 | $54,955 | $45,492 | $57,058 | $63,864 | -9.0% |
| 2030 | $56,714 | $44,081 | $59,626 | $69,293 | -11.8% |
| 2031 | $58,529 | $42,714 | $62,309 | $75,183 | -14.6% |
| 2032 | $60,402 | $41,390 | $65,113 | $81,573 | -17.2% |
| 2033 | $62,334 | $40,106 | $68,043 | $88,507 | -19.8% |
| 2034 | $64,329 | $38,863 | $71,105 | $96,030 | -22.3% |
| 2035 | $66,388 | $37,658 | $74,305 | $104,193 | -24.7% |
| 2036 | $68,512 | $36,490 | $77,648 | $113,049 | -27.0% |
| 2037 | $70,704 | $35,358 | $81,143 | $122,658 | -29.3% |
| 2038 | $72,967 | $34,262 | $84,794 | $133,084 | -31.5% |
| 2039 | $75,302 | $33,200 | $88,610 | $144,396 | -33.6% |
| 2040 | $77,712 | $32,170 | $92,597 | $156,670 | -35.7% |
| 2041 | $80,198 | $31,173 | $96,764 | $169,987 | -37.7% |
Understanding Inflation & Purchasing Power Decay
Inflation is the invisible tax on cash holdings. By understanding how compound inflation erodes purchasing power, investors can structure portfolios that protect real purchasing power over multi-decade horizons.
1. What is the Difference Between CPI and Core Inflation?
Headline Consumer Price Index (CPI) measures price changes across a broad basket of consumer goods and services including food and energy. Core Inflation excludes volatile food and energy components to measure baseline underlying macroeconomic price trends.
2. What is Shrinkflation?
Shrinkflation occurs when manufacturers reduce the size, weight, or quantity of a product while keeping the shelf price unchanged. While nominal price stickers remain steady, the unit cost per gram or ounce rises, quietly reducing consumer purchasing power.
3. Why Cash is the Riskiest Long-Term Asset
While cash has zero nominal volatility in the short term, holding substantial cash over 10-30 years guarantees a 100% certainty of real purchasing power loss. In a 3.5% inflation regime, cash loses half its purchasing power every 20 years.
4. Best Proven Hedges Against Inflation
Historically, diversified equities (corporate earnings growth), prime real estate (rental yield inflation adjustments), Treasury Inflation-Protected Securities (TIPS), and scarce monetary commodities have outperformed inflation over 10+ year holding periods.