Inflation-Adjusted Calculator
Find the future nominal amount and the loss of purchasing power from an amount, inflation rate and number of years.
Input Data
Results
At a glance:Future nominal = today's amount x (1 + inflation rate)^years. Purchasing-power loss% = [1 - 1/(1 + r)^years] x 100, the share of real purchasing power lost. Example: HK$1,000,000 at 2.5% for 20 years gives a future nominal of about HK$1,638,616 and a loss of about 39.0%. WARNING: The estimate assumes a constant rate; Hong Kong's long-run average inflation is about 2-3% but varies. Use a conservative rate for stress testing.
Formula
Future nominal = today's amount × (1 + r)^n, r = annual inflation rate, n = years.
Purchasing-power loss% = (1 − (1+r)^−n) × 100.
How to Use
- Enter today's amount.
- Enter the expected annual inflation rate and the number of years.
- View the future nominal equivalent and the purchasing-power loss.
FAQ
What is the difference between nominal and real value?
Nominal is the face amount (how much money you need in the future); real is the purchasing power after removing inflation (here it stays equal to today's amount). Plan savings goals in nominal terms, but judge adequacy in real terms.
What is Hong Kong's inflation rate roughly?
The long-run average is about 2-3%, but individual years swing widely (pandemics, rents, prices). The tool uses your input; a conservative value such as 3% is sensible for stress testing.
Why compound rather than simple interest?
Inflation erodes purchasing power continuously — after a rise, the base is higher, so compounding better reflects reality. Over long periods the gap between compound and simple is significant.
How does this relate to investment returns?
Nominal investment return minus inflation is the real return. For example, 8% nominal with 3% inflation gives a real return of about (1.08/1.03) - 1 = 4.85%. Use the two tools together to assess true profit.
How do I use this for retirement planning?
First compute the nominal monthly spending you will need at retirement (with this tool), then use a retirement calculator for the required capital. Inflation is retirement's hidden enemy — always include it.
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References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.