Inflation Calculator
Inflation has two faces. It pushes up the future price of the things you buy, and it quietly shrinks what a fixed pile of cash can purchase. This calculator shows both: how much a basket of goods costing your amount today will cost in the future, and how little that same amount, left uninvested, would buy down the line.
- Retained buying power
- Lost to inflation
- Today’s amount
- $1,000.00
- Future cost — same goods
- $1,343.92
- Future buying power of today’s amount
- $744.09
At 3% inflation, goods costing 1000 today will cost about 1344 in 10 years. Put another way, 1000 kept under the mattress would buy only 744 worth of today’s goods — a loss of 256 in purchasing power.
How it works
Inflation compounds just like interest, only working against you. Each year, prices rise by the inflation rate applied to the already-higher prices from the year before, so the effect snowballs. To find the future cost of goods that cost a given amount today, you multiply by (1 + inflation rate) raised to the number of years.
The flip side is purchasing power. If you hold a fixed amount of cash that earns nothing, its real value falls by the same compounding factor. Dividing today’s amount by (1 + inflation rate)^years tells you what that money would actually buy in today’s terms once future prices have risen. The two figures are reflections of one another: one inflates prices upward, the other deflates money’s reach downward.
The gap between the amount you started with and its future buying power is the silent cost of holding idle cash — money that needs to at least match inflation just to stand still.
future cost = amount × (1 + i)^t, where i = inflation rate (as a decimal) and t = years. Future buying power of a fixed amount = amount ÷ (1 + i)^t. The two are mirror images of the same compounding.
Worked example
At 3% annual inflation, goods costing 1,000 today will cost about 1,344 in 10 years. Meanwhile, 1,000 left as idle cash would buy only around 744 worth of today’s goods after a decade — inflation having quietly eroded roughly 256 of its purchasing power.
Things to watch out for
This uses a constant inflation rate, but real inflation varies year to year and differs by category — housing, healthcare, and education often outpace the headline rate, while electronics can fall in price. The model assumes the cash earns nothing; money invested at or above the inflation rate preserves or grows its real value, which is the whole point of investing. Use a long-run average rate (often around 2–3% in stable economies) for planning, and revisit it as conditions change.
Frequently asked questions
How does inflation reduce the value of money?+
As prices rise, each unit of currency buys less. A fixed amount of cash that earns nothing therefore loses real value every year. At 3% inflation, money loses roughly a quarter of its purchasing power over a decade.
What is the difference between future cost and future buying power?+
Future cost is how much more you will pay for the same goods later. Future buying power is how little a fixed amount of today’s money will buy later. They are two views of the same compounding — one looks at prices going up, the other at money’s reach going down.
What inflation rate should I use?+
For long-term planning, a stable-economy average of around 2–3% is a reasonable default. For specific costs like healthcare or education, use a higher category-specific rate, since those tend to rise faster than the headline figure.
How can I protect my money from inflation?+
Hold it in something that grows at or above the inflation rate rather than as idle cash. Investments, inflation-linked bonds, and interest-bearing accounts can preserve or build real value. A compound interest or investment calculator shows whether your return is beating inflation.
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Disclaimer: This calculator is for educational and informational purposes only and provides estimates, not financial advice. Interest rates, taxes, fees, and local rules vary and change over time. Confirm figures with a qualified professional before making any financial decision.
Last reviewed: 2026-06-22