Inflation Calculator
See how inflation changes the purchasing power of money.
All calculations happen locally in your browser — nothing is uploaded, stored or tracked.
Enter the amount
The sum you are analysing.
Set the inflation rate
Use a historical average or a forecast you trust.
Choose the period
Years forward or backward.
What Is an Inflation Calculator?
Inflation erodes purchasing power: the same amount of money buys less over time as prices rise. This calculator shows both directions — how much a sum today will be worth in the future, and what a past amount would equal today.
You enter the inflation rate yourself, because rates vary by country and year, and this static site does not fetch live statistics. Historical average rates are roughly 2–3% in many developed economies but have ranged much higher.
The Formula
Where n is the number of years. The result is the amount needed in the future to have the same purchasing power as the original amount today.
Your data never leaves your device.
Every calculation on this site runs in your browser using vanilla JavaScript. Nothing is uploaded, stored or tracked.
- 100% local, client-side calculations
- No data stored on any server
- No tracking, no analytics, no ads scripts
- Works offline once loaded
Frequently Asked Questions
What is a typical inflation rate?
Central banks in many developed countries target about 2% annually, though actual rates vary by year and country — enter your own assumption.
How much will $1,000 be worth in 20 years at 3% inflation?
About $554 in today's purchasing power — inflation compounds just like interest.
How do I calculate the real return on an investment?
Use the inflation-adjusted return calculator: it combines your nominal return with an inflation assumption.
Does the calculator use official CPI data?
No — it is a pure compounding tool at the rate you enter. It does not fetch live statistics.
Why does the calculator need the rate from me?
This is a fully static, offline site with no data feeds. Entering your own rate keeps the result transparent and accurate for your situation.