What inflation means for your budget
Inflation describes a general rise in prices over time. If household costs climb while income stays unchanged, the same paycheck buys fewer goods and services. The actual rate varies across countries, categories and periods, so this calculator asks you to choose the rate.
Future price calculation
For a price P, annual rate i and a horizon of t years, the projected future cost is P × (1 + i)^t, using i in decimal form. Compounding means each new year’s increase applies to the price after previous increases, not just the original amount.
Example: an everyday purchase
Suppose you spend $1,000 today on a recurring set of goods. Assuming prices rise 3% annually for 10 years, that same basket would cost about $1,343.92. The difference of about $343.92 is the modeled cumulative increase, not a guaranteed future price.
Purchasing power is the reverse view
If you keep $1,000 unchanged while prices increase 3% per year for 10 years, its future purchasing power relative to today would be about $744.09. This uses division by the same compounded inflation factor. A price projection and a purchasing-power calculation answer different questions.
Compare annual assumptions
For a ten-year horizon, a 2% rate produces a multiplier near 1.219; 3% gives 1.344; and 5% gives 1.629. Small changes in annual assumptions can materially change long-term estimates. Test several plausible scenarios rather than treating one percentage as certain.
Inflation versus investment return
An investment return may increase an account balance, but a portion of that nominal growth can be offset by rising prices. A rough real-return calculation is (1 + nominal return) / (1 + inflation) − 1. The calculator here isolates inflation and does not assume a specific investment performance.
Inflation varies by place and category
Official inflation indexes are generally built from representative baskets, while any individual household can face different changes in housing, health care, energy and food costs. This calculator does not pull national historical CPI records or adjust for region-specific indexes.
Using the results responsibly
For long-term goals, estimate several inflation rates, check current official statistics independently and revisit assumptions periodically. A negative rate is allowed above −100% to explore price deflation mathematically, though prolonged deflation has different economic implications.
Inflation scenarios for a long-term savings goal
Suppose you expect to spend $2,000 per month on essential expenses today and you are planning ten years ahead. Under a constant 3% inflation assumption, the comparable expense is approximately $2,687.83 per month after ten years. This result does not predict the economy; it shows how sensitive a goal can be to compounding. Repeat the calculation at 2% and 5% to understand the range of outcomes.
Future cost versus value in today’s money
These are two different calculations. Future cost multiplies today’s price by the inflation factor. Purchasing power divides a fixed money balance by that same factor to express its value relative to today’s prices. A $1,000 purchase projected at $1,343.92 and a fixed $1,000 holding with purchasing power of $744.09 are consistent reverse views under a 3% rate for ten years.
Comparing purchasing-power assumptions
| Annual inflation | 5-year multiplier | 10-year multiplier |
|---|---|---|
| 2% | 1.1041× | 1.2190× |
| 3% | 1.1593× | 1.3439× |
| 5% | 1.2763× | 1.6289× |
The table uses constant annual compounding. Actual inflation changes over time and differs by country and type of purchase.
Inflation and salary increases
A nominal pay raise may not improve purchasing power if prices increase by the same or a greater proportion. A simple approximation subtracts inflation from nominal wage growth, but the mathematically exact comparison is (1 + wage-growth rate) ÷ (1 + inflation rate) − 1. This calculator does not estimate income taxes or future salaries; it focuses on the price-level scenario you enter.