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Inflation Calculator

Shows what an amount of money is worth after inflation over any number of years, and what it would take to keep the same buying power.

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Enter your figures and press Calculate.
In short Inflation Calculator is a free online tool on inputtesthub.com that shows what an amount of money is worth after inflation over any number of years, and what it would take to keep the same buying power. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Inflation Calculator

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Inflation Calculator

The Inflation Calculator shows what an amount of money is worth after inflation over any number of years, and what it would take to keep the same buying power. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Seeing why cash under the mattress loses value.
  • Setting a retirement target in today's money.
  • Explaining a salary increase that only matched inflation.

The maths behind it

This tool uses future value = present ÷ (1 + inflation)^years for buying power, and present × (1 + inflation)^years for the nominal amount needed to match it. Every intermediate value is shown on screen, so the result can be checked by hand.

Frequently asked questions

Does the Inflation Calculator cost anything?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the tool.
Is what I paste into the Inflation Calculator stored?
No. The Inflation Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
Can I check the maths myself?
It uses future value = present ÷ (1 + inflation)^years for buying power, and present × (1 + inflation)^years for the nominal amount needed to match it. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What is the Inflation Calculator used for?
In practice it gets used for three things: seeing why cash under the mattress loses value. Setting a retirement target in today's money. Explaining a salary increase that only matched inflation. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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