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Inflation Impact Calculator – What Will Your Money Be Worth?

See how inflation erodes purchasing power over time with interactive chart & Rule of 72

📋 Your Money Today

Formula: PP = P ÷ (1 + i)t
$
%
yr

📊 Results

Future Purchasing Power
—
Value Lost to Inflation
—
Purchasing Power Remaining
—
📐 Rule of 72 (Inflation)
Years for Prices to Double
— years
At Current Rate
2.5%
Quick estimate: Prices roughly double (and your money halves in real terms) every — years at this inflation rate.
Real Purchasing Power
Original Amount

📅 Year-by-Year Breakdown

Year Purchasing Power Value Lost % Remaining
Adjust inputs to see results

How to Use the Inflation Impact Calculator

The free Inflation Impact Calculator shows how rising prices quietly reduce the real value of cash and savings over time. Enter the amount you hold today, an expected annual inflation rate and a time horizon to see future purchasing power, the total value lost, an interactive erosion chart, year-by-year breakdown and the Rule of 72 for price doubling.

Step-by-Step Guide

1. Enter Your Details

Begin by setting the parameters that match the money you want to analyse:

2. Calculate the Impact

Results update automatically as soon as you change any input. The application uses the standard formula for real purchasing power:

Formula: PP = P ÷ (1 + i)t

You can explore different inflation scenarios in real time simply by adjusting the values above.

3. Interpret the Results

After calculation, the app displays three core metrics under the Results section:

4. Use Additional Features

Beyond the headline numbers, the app includes two powerful visual tools:

Tip: Try different inflation rates (for example 2 %, 3 % or 5 %) and longer time horizons to see how dramatically even modest inflation compounds over decades.

Common Scenarios & Examples

Scenario: Cash Sitting in a Savings Account

Goal: Understand how much real spending power a lump sum will lose if left as cash for 20 years.

  1. Select your preferred currency (e.g. USD).
  2. Enter a Current Amount of $10,000.
  3. Set Annual Inflation Rate to 2.5%.
  4. Set Time Horizon to 20 years.
  5. Observe the live results, the declining chart and the year-by-year table.
Sample Inputs:
  • Current Amount: $10,000
  • Annual Inflation Rate: 2.5%
  • Time Horizon: 20 years

Approximate results: Future Purchasing Power ≈ $6,100  |  Value Lost ≈ $3,900  |  Remaining ≈ 61%

Even at a relatively mild 2.5 % inflation rate, more than a third of the real value can disappear over two decades if the money earns no return that matches or exceeds inflation.

Using the Rule of 72 for Inflation

Goal: Get a quick sense of how long it will take for prices to double (and for cash to lose half its purchasing power).

  1. Enter (or leave) an Annual Inflation Rate of 2.5%.
  2. Look at the Rule of 72 box under Results.
  3. The calculator shows that prices roughly double every 28.8 years at this rate (72 ÷ 2.5 ≈ 28.8).
Rule of 72 at 2.5% inflation:

Years for prices to double ≈ 28.8 years

Disclaimer & Limitations

Not Professional Advice: This calculator is provided as an estimation and educational tool and does not constitute professional financial advice. Actual inflation rates vary over time and across countries. Past inflation is not a guarantee of future rates. Consult a qualified financial advisor for advice tailored to your situation.

Assumptions: Calculations assume a constant annual inflation rate compounded yearly, no investment returns, no fees, taxes or other adjustments. Real-world inflation fluctuates and the purchasing power of different goods and services changes at different rates.

Estimation Purposes Only: The year-by-year table and chart are illustrative. They show the mathematical effect of steady inflation on a fixed nominal sum held as cash.

Bug Reports and Suggested Improvements

Please email all suggestions for improvements and any bug reports to: inflationimpactcalc@personalfinances.me, thank you.