Inflation Table – Future Prices & Purchasing Power by Year
Look up how a constant annual inflation rate changes the future price of a $1,000 basket and the purchasing power of a fixed $1,000 over one to thirty years.
Future price of a $1,000 basket by inflation rate and year
Choose an assumed annual inflation rate in the first column and a time horizon across the top. The cell estimates how much money would be needed at that future date to buy a basket costing $1,000 today.
| Annual inflation | 1 year | 5 years | 10 years | 15 years | 20 years | 25 years | 30 years |
|---|---|---|---|---|---|---|---|
| 1% | $1,010.00 | $1,051.01 | $1,104.62 | $1,160.97 | $1,220.19 | $1,282.43 | $1,347.85 |
| 2% | $1,020.00 | $1,104.08 | $1,218.99 | $1,345.87 | $1,485.95 | $1,640.61 | $1,811.36 |
| 3% | $1,030.00 | $1,159.27 | $1,343.92 | $1,557.97 | $1,806.11 | $2,093.78 | $2,427.26 |
| 4% | $1,040.00 | $1,216.65 | $1,480.24 | $1,800.94 | $2,191.12 | $2,665.84 | $3,243.40 |
| 5% | $1,050.00 | $1,276.28 | $1,628.89 | $2,078.93 | $2,653.30 | $3,386.35 | $4,321.94 |
| 7% | $1,070.00 | $1,402.55 | $1,967.15 | $2,759.03 | $3,869.68 | $5,427.43 | $7,612.26 |
| 10% | $1,100.00 | $1,610.51 | $2,593.74 | $4,177.25 | $6,727.50 | $10,834.71 | $17,449.40 |
Example: at 3% annual inflation, a basket priced at $1,000 today has a modelled future cost of $1,343.92 after 10 years and $1,806.11 after 20 years. The 20-year value is not $1,600 because each annual increase is applied to the price level reached in the previous year.
For another starting price, multiply the table value by current price ÷ 1,000. A $75 basket at 4% for 15 years is therefore approximately $1,800.94 × 0.075 = $135.07.
Need an exact amount, custom rate or financial plan?
Use this page for a quick lookup, then open the relevant calculator to enter a precise rate, compare scenarios or convert the inflation result into a savings target.
Purchasing power of a fixed $1,000 after inflation
This table asks the opposite question. Instead of increasing the amount to keep up with prices, it holds the nominal $1,000 unchanged and shows how much of today’s basket it could buy later. Positive inflation makes the displayed purchasing power fall.
| Annual inflation | 1 year | 5 years | 10 years | 15 years | 20 years | 25 years | 30 years |
|---|---|---|---|---|---|---|---|
| 1% | $990.10 | $951.47 | $905.29 | $861.35 | $819.54 | $779.77 | $741.92 |
| 2% | $980.39 | $905.73 | $820.35 | $743.01 | $672.97 | $609.53 | $552.07 |
| 3% | $970.87 | $862.61 | $744.09 | $641.86 | $553.68 | $477.61 | $411.99 |
| 4% | $961.54 | $821.93 | $675.56 | $555.26 | $456.39 | $375.12 | $308.32 |
| 5% | $952.38 | $783.53 | $613.91 | $481.02 | $376.89 | $295.30 | $231.38 |
| 7% | $934.58 | $712.99 | $508.35 | $362.45 | $258.42 | $184.25 | $131.37 |
| 10% | $909.09 | $620.92 | $385.54 | $239.39 | $148.64 | $92.30 | $57.31 |
How to read $553.68: under a constant 3% scenario for 20 years, an unchanged $1,000 would buy approximately the quantity of goods that $553.68 buys at the starting date. It does not mean $1,000 disappears from the account; its nominal balance and purchasing power are different measures.
To scale the values, multiply by fixed amount ÷ 1,000. For example, $40,000 held unchanged for 20 years at 2% has modelled starting-date purchasing power of 40 × $672.97 = $26,918.80.
Cumulative price increase and purchasing-power loss
The two percentages are related but not equal. If prices rise by 100%, a basket costs twice as much; the fixed amount then buys half as much, which is a 50% purchasing-power loss. This lookup table makes that asymmetry visible.
| Annual inflation | 10-year price increase | 10-year power loss | 20-year price increase | 20-year power loss | 30-year price increase | 30-year power loss |
|---|---|---|---|---|---|---|
| 1% | 10.46% | 9.47% | 22.02% | 18.05% | 34.78% | 25.81% |
| 2% | 21.90% | 17.97% | 48.59% | 32.70% | 81.14% | 44.79% |
| 3% | 34.39% | 25.59% | 80.61% | 44.63% | 142.73% | 58.80% |
| 4% | 48.02% | 32.44% | 119.11% | 54.36% | 224.34% | 69.17% |
| 5% | 62.89% | 38.61% | 165.33% | 62.31% | 332.19% | 76.86% |
| 7% | 96.72% | 49.17% | 286.97% | 74.16% | 661.23% | 86.86% |
| 10% | 159.37% | 61.45% | 572.75% | 85.14% | 1,644.94% | 94.27% |
Do not estimate cumulative inflation by multiplying the annual rate by the number of years except as a very rough short-term approximation. At 3% for 30 years, multiplication suggests 90%, while annual compounding gives a 142.73% price increase.
Approximate years until purchasing power falls by 10%, 25% or 50%
These values solve for the time at which a fixed amount reaches 90%, 75% or 50% of its starting purchasing power. Fractional years are mathematical crossing points; actual published inflation varies from year to year.
| Constant annual inflation | 10% power loss | 25% power loss | 50% power loss |
|---|---|---|---|
| 1% | 10.6 years | 28.9 years | 69.7 years |
| 2% | 5.3 years | 14.5 years | 35.0 years |
| 3% | 3.6 years | 9.7 years | 23.4 years |
| 4% | 2.7 years | 7.3 years | 17.7 years |
| 5% | 2.2 years | 5.9 years | 14.2 years |
| 7% | 1.6 years | 4.3 years | 10.2 years |
| 10% | 1.1 years | 3.0 years | 7.3 years |
Example: with constant 3% inflation, a fixed sum loses half of its starting purchasing power after about 23.4 years. Equivalently, the price level has roughly doubled at that point.
This is sometimes described as a “purchasing-power half-life.” It is a scenario shortcut, not a prediction about when real-world prices will double.
Formulas behind the inflation and purchasing-power tables
Let P be the starting amount, r the annual inflation rate as a decimal, and n the number of years. The price-level factor is the same compounding structure used for growth, but purchasing power uses its reciprocal.
Future purchasing power = P ÷ (1 + r)n
Cumulative price increase equals [(1 + r)n − 1] × 100%. Purchasing-power loss equals [1 − 1 ÷ (1 + r)n] × 100%.
For a 25% loss, q is 0.75. The logarithmic formula is not used when the rate is 0%, because purchasing power does not cross a loss threshold in a constant 0% scenario.
Constant-rate scenario versus historical inflation data
| Question | Use this table | Use an official CPI series |
|---|---|---|
| What if inflation averages 2%, 3% or 5%? | Yes — compare modelled constant-rate scenarios. | Not required for the hypothetical calculation. |
| How much did prices change between two past dates? | No — a constant assumption can differ from history. | Yes — use the relevant country and index period. |
| What will my personal grocery or housing costs be? | Only as a broad stress test. | A headline index may still differ from your basket. |
| Can this revalue a contract or legal payment? | No. | Use the exact index and method named in the contract or law. |
Official consumer-price indexes measure a defined reference basket and are revised, rebased and published under specific statistical methods. A national headline CPI, a regional index and an individual household’s experienced inflation can all differ. Choose the source that matches the question.
The table deliberately contains no “current inflation rate.” That prevents a temporary monthly or annual reading from being mistaken for a guaranteed rate over 10, 20 or 30 years.
For economics and finance students: read both sides of the factor
Worked check: verify the 20-year entries for 3% inflation.
- Convert the rate: r = 3% = 0.03.
- Build the price factor: 1.0320 ≈ 1.806111.
- Future price of $1,000: 1,000 × 1.806111 = $1,806.11.
- Purchasing power of $1,000: 1,000 ÷ 1.806111 = $553.68.
- Interpretation: prices are 80.61% higher, while fixed-money purchasing power is 44.63% lower.
Exercise 1: scale a table value
Exercise 2: explain the unequal percentages
Common mistakes when using an inflation table
- Adding the same percentage to the original price every year instead of compounding the changing price level.
- Treating future cost and future purchasing power as interchangeable outputs.
- Assuming a 50% price increase means a 50% purchasing-power loss; the corresponding loss is 33.33%.
- Using a current one-year inflation reading as a certain multi-decade forecast.
- Applying one general CPI rate to a specific expense that follows a different price path.
- Mixing nominal future money with today’s real purchasing power in the same budget.
- Using rounded lookup values when a contract, report or exact target requires full precision.