How Inflation Erodes Purchasing Power Over Time
Illustrative analysis: 100 scenarios show how a fixed cash balance loses purchasing power when prices rise at a constant annual rate.
Scenario version 1.0 · Reviewed
A cash balance can stay the same while buying less
At an assumed 3% annual inflation rate, an unchanged $10,000 balance after 10 years buys the equivalent of $7,440.94 in starting-year goods and services. That is a 25.59% reduction in purchasing power, even though the nominal balance is still $10,000.
These are deterministic examples, not a survey, historical inflation series or forecast. Use the Inflation Spending Power Calculator to explore other assumptions, including optional interest.
Thirty years of purchasing power
The chart starts with $10,000 and applies each assumed rate annually. Higher inflation compounds into faster purchasing-power loss.
All 100 scenarios
Dollar amounts below are purchasing power in starting-year US dollars, rounded to cents. Each table covers one unchanged nominal balance. Horizontal scrolling is available on narrow screens.
Starting balance: $1,000.00
| Inflation | 1 year | 5 years | 10 years | 20 years | 30 years |
|---|---|---|---|---|---|
| 2% | $980.39 | $905.73 | $820.35 | $672.97 | $552.07 |
| 3% | $970.87 | $862.61 | $744.09 | $553.68 | $411.99 |
| 5% | $952.38 | $783.53 | $613.91 | $376.89 | $231.38 |
| 8% | $925.93 | $680.58 | $463.19 | $214.55 | $99.38 |
Starting balance: $5,000.00
| Inflation | 1 year | 5 years | 10 years | 20 years | 30 years |
|---|---|---|---|---|---|
| 2% | $4,901.96 | $4,528.65 | $4,101.74 | $3,364.86 | $2,760.35 |
| 3% | $4,854.37 | $4,313.04 | $3,720.47 | $2,768.38 | $2,059.93 |
| 5% | $4,761.90 | $3,917.63 | $3,069.57 | $1,884.45 | $1,156.89 |
| 8% | $4,629.63 | $3,402.92 | $2,315.97 | $1,072.74 | $496.89 |
Starting balance: $10,000.00
| Inflation | 1 year | 5 years | 10 years | 20 years | 30 years |
|---|---|---|---|---|---|
| 2% | $9,803.92 | $9,057.31 | $8,203.48 | $6,729.71 | $5,520.71 |
| 3% | $9,708.74 | $8,626.09 | $7,440.94 | $5,536.76 | $4,119.87 |
| 5% | $9,523.81 | $7,835.26 | $6,139.13 | $3,768.89 | $2,313.77 |
| 8% | $9,259.26 | $6,805.83 | $4,631.93 | $2,145.48 | $993.77 |
Starting balance: $25,000.00
| Inflation | 1 year | 5 years | 10 years | 20 years | 30 years |
|---|---|---|---|---|---|
| 2% | $24,509.80 | $22,643.27 | $20,508.71 | $16,824.28 | $13,801.77 |
| 3% | $24,271.84 | $21,565.22 | $18,602.35 | $13,841.89 | $10,299.67 |
| 5% | $23,809.52 | $19,588.15 | $15,347.83 | $9,422.24 | $5,784.44 |
| 8% | $23,148.15 | $17,014.58 | $11,579.84 | $5,363.71 | $2,484.43 |
Starting balance: $50,000.00
| Inflation | 1 year | 5 years | 10 years | 20 years | 30 years |
|---|---|---|---|---|---|
| 2% | $49,019.61 | $45,286.54 | $41,017.41 | $33,648.57 | $27,603.54 |
| 3% | $48,543.69 | $43,130.44 | $37,204.70 | $27,683.79 | $20,599.34 |
| 5% | $47,619.05 | $39,176.31 | $30,695.66 | $18,844.47 | $11,568.87 |
| 8% | $46,296.30 | $34,029.16 | $23,159.67 | $10,727.41 | $4,968.87 |
Download all 100 scenarios as CSV — free, no signup or email required. Columns include starting amount, annual inflation percent, years, remaining purchasing power, dollar loss and percentage loss.
Method and reproduction
Purchasing power = starting balance / (1 + annual inflation rate)^years. Convert the percent rate to a decimal first: 3% becomes 0.03. Dollar loss is starting balance minus purchasing power; percentage loss divides that difference by the starting balance and multiplies by 100.
The existing calculator engine generates every table value, chart point and CSV row. The scenario grid is five balances × four rates × five horizons = 100 rows. The chart also includes each intervening whole year from 0 through 30. Computation retains floating-point precision; the download rounds dollar results to two decimals and loss percentages to four. Displayed percentages in the text use two decimals.
Version 1.0 uses balances of $1,000, $5,000, $10,000, $25,000 and $50,000; rates of 2%, 3%, 5% and 8%; and horizons of 1, 5, 10, 20 and 30 years. The amounts and rates are selected examples, not sampled observations. See our methodology and source principles.
Source context and limits
The Bureau of Labor Statistics explanation of purchasing power and constant dollars (opens in a new tab) provides the price-level adjustment context. The European Central Bank explanation of inflation (opens in a new tab) describes baskets of goods and differing household experiences. Neither source supplies or endorses these scenario rates.
The model assumes constant inflation and an unchanged nominal balance, with no interest, investment returns, taxes, fees, deposits or withdrawals. Real inflation varies over time and across households. US dollars are a display convention, not a claim about a future US price index. A change in purchasing power is not a prediction of an account loss or a recommendation about investments.
You may cite this page or reuse the CSV with the assumptions and version intact. Suggested citation: BuzCalculator, “How Inflation Erodes Purchasing Power Over Time,” illustrative analysis, version 1.0, 2026-09-28. See media and educator guidance for contact details; attribution is optional.