CalcaTools

Inflation Calculator

An inflation calculator shows how rising prices erode the purchasing power of money, projecting the future value and real worth of an amount over time.

Last updated: June 2026 · Free · No sign-up required

$
%
Results

Enter values above and click Calculate to see your result instantly.

Live market prices Real-time crypto, stocks & indices, updated continuously.

Quick reference

What $100 grows to at different inflation rates:

Years2%/yr3%/yr5%/yr
5$110.41$115.93$127.63
10$121.90$134.39$162.89
20$148.59$180.61$265.33
30$181.14$242.73$432.19

savings Plan with confidence

Finance decisions get a lot easier when you can see the full picture. Enter your numbers above to see total payments, interest paid, and the long-term cost of every choice — so you can compare options side by side before signing anything.

percent How the math works

We use the standard amortization, compound-interest and present-value formulas published by the Consumer Financial Protection Bureau and the Federal Reserve. The methodology block below shows every variable and rounding step we apply, so the answer is never a black box.

shield_lock Your data stays private

Every calculation happens in your browser with JavaScript — your income, balances, and loan numbers are never sent to our servers, logged, or shared. Close the tab and the inputs vanish. No sign-up, no tracking pixels on the form, no spreadsheet emailed to you later.

lightbulb Pro tip

Save the URL after you calculate — your inputs aren't stored, so write down the headline number plus the breakdown. Then come back and edit one variable at a time (down payment, rate, term) to see exactly which lever moves your monthly figure the most. That's where the real planning happens.

Interpretation guide

Inflation terms explained:

TermMeaning
CPIConsumer Price Index — tracks average prices
Purchasing powerWhat a fixed amount of money can actually buy
Real vs nominalReal is inflation-adjusted; nominal is not
Rule of 70Years to halve buying power ~ 70 / inflation rate

Formula & methodology

Formula: Future cost = Present amount x (1 + i)^n; Today's value = Past amount x (CPI_now / CPI_then)

Inflation erodes the purchasing power of money: a fixed sum buys less each year. The calculator compounds an annual inflation rate over your time span, or uses CPI ratios to convert a past amount into today's dollars. It's useful for retirement planning, salary comparisons across decades, and understanding why returns need to beat inflation to grow real wealth.

Authoritative source: U.S. Bureau of Labor Statistics

Frequently asked questions

How does inflation affect my savings?
It reduces what your money can buy. If your savings earn less than inflation, your real (purchasing-power) balance shrinks over time.
What is a normal inflation rate?
Many central banks target around 2% annually. Higher rates erode buying power faster; the Rule of 70 estimates the years to halve it.
How do I convert old prices to today's dollars?
Multiply the past amount by the ratio of the current CPI to the CPI in that year. This calculator does it automatically.
What's the difference between real and nominal value?
Nominal is the face amount; real value is adjusted for inflation so you can compare purchasing power across years.
Why must investments beat inflation?
If an investment returns less than inflation, you lose purchasing power even though the dollar balance rises.