i What this calculator does
This calculator works out how much your money's purchasing power erodes over time at a given inflation rate, compounded annually, showing you the real, inflation-adjusted future value.
Enter your current amount, expected annual inflation rate, and number of years, and the calculator returns the eroded purchasing power, worth considering alongside how the repo rate factors into monetary policy.
This calculator is for educational purposes only. Check Stats SA for the current official CPI figure.
How to use the Inflation Calculator
Nothing needs typing before the calculator responds. Adjust a single input and the result moves with it.
- 1. Current Amount (R)
- 2. Annual Inflation Rate (%)
- 3. Number of Years
The result panel reports:
- Inflation Rate Compounded annually
Alongside the headline figures, the calculator reports equivalent future cost, inflation rate, real value, purchasing power lost. Those are the numbers that usually explain why the headline result came out where it did.
Every stage appears beneath the output, so the figure can be audited against your own numbers.
One caution worth stating. A calculator answers exactly the question you pose to it, and the quality of the answer is set entirely by the inputs. Figures taken from a single period, an optimistic forecast, or a sample too small to be meaningful will produce a precise number that is not a reliable one. Where the result will inform a real decision, run it at several plausible inputs and treat the spread as the answer rather than any single figure.
The same applies to comparisons. A figure is informative against a benchmark, a sector average or the same measure over the company's own history, and much less so on its own. That context is what turns a number into a judgement.
See also: Bond vs Invest Calculator.
Frequently asked questions
What inflation rate should I use for South Africa?
The SARB now targets 3%, with a tolerance band of one percentage point either side, replacing the old 3% to 6% range. Stats SA publishes the current rate monthly from the CPI, so check the latest figure for the most accurate current rate rather than relying on a fixed historical average.
Does this calculator account for compounding inflation?
Yes, inflation compounds year over year just like investment returns, this calculator applies your entered rate compounded across your chosen number of years, not a simple flat percentage multiplied by years.
Why does inflation matter for my trading capital sitting in cash?
Cash that isn't earning a return above the inflation rate is losing real purchasing power over time, even without any market losses, this is part of why some traders view holding excess cash as carrying its own opportunity cost.
How is this different from a compound growth calculator?
This calculator specifically shows value erosion (the same Rand amount buying less over time), our Compound Growth Calculator shows value growth (an investment increasing), you can use both together to see your real, inflation-adjusted returns.
Does South Africa's inflation rate differ from other countries?
Yes, inflation rates vary by country based on local economic conditions, South Africa's has historically run higher than developed economies like the US or UK, worth factoring in specifically when comparing purchasing power across currencies.
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