Use this inflation impact calculator to estimate how rising prices could affect the future buying power of your money. See what today's money may need to grow to in the future to keep the same spending power.
Inflation impact estimate
To match the spending power of £10,000 today after 10 years at 3% inflation
| Year | Equivalent cost | Future buying power | Spending power lost |
|---|
Estimates assume a fixed inflation rate every year and are for planning only. Actual inflation changes over time and may differ from the rate used here.
Inflation means prices can rise over time, so the same amount of cash usually buys less in the future. This calculator is focused on that forward-looking impact: how much value money could lose and what future amount may be needed to keep pace.
It is built for planning rather than prediction. You choose an annual inflation assumption and see how outcomes change over your selected timeframe.
Future equivalent cost answers: how much may be needed later to match today's spending power. Future purchasing power answers: what today's amount might feel like in real terms if it does not grow.
Showing both side by side gives a clearer picture than historic-only conversion because it helps you plan budgets and targets for future goals.
Cash held without growth keeps its face value but not its buying power. At positive inflation rates, goods and services usually cost more over time, so unchanged cash can cover less.
This is why long-term planning often compares expected inflation with expected returns from savings or investments.
A simple planning rule is that required return to keep pace is roughly equal to the inflation rate used in your projection. If return is lower than inflation, real buying power may still fall.
Use the optional comparison return field to test whether your assumed growth appears to keep pace with your inflation assumption.
CPI, CPIH, and RPI are different inflation measures and can produce different annual rates. This calculator does not switch between indices, so choose a rate that reflects your preferred planning basis.
If you later need historic mode, ONS and Bank of England sources are the right data foundations rather than manually maintained assumptions.
Enter today's amount, an annual inflation rate, and a time period. The calculator estimates how much that amount may need to grow to keep the same spending power.
It depends on inflation. At higher inflation rates, £10,000 in cash usually buys less in future. This tool estimates both future equivalent cost and remaining buying power.
Use a planning assumption that fits your timeframe and risk tolerance. You can test a few rates to compare best-case and worst-case outcomes.
They are different inflation measures with different methodologies and coverage. This calculator does not switch between them in V1, so choose an annual rate that matches your preferred measure.
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