Break-Even Inflation Rate Calculator
Inflation rate at which a nominal return ends up flat in real terms.
Find the inflation rate that would exactly match your nominal return, leaving real purchasing power unchanged. Free and runs in your browser.
What this tool does
A 5% nominal return sounds fine, but if inflation is also 5% the real return is zero — your purchasing power hasn't changed. This tool shows the break-even inflation rate: inflation at or above this figure makes your 'return' negative in real terms. Use it to sanity-check whether your assumptions protect wealth or just maintain it.
Enter Values
Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
A 5% nominal return breaks even at 5% inflation. Above that, real return is negative — you're losing purchasing power even though the number in your account grows. Cash savings with 3% rates get crushed in 6% inflation environments, which is why high-inflation periods hurt savers most.
How to use it
Enter your expected nominal annual return. The tool returns the inflation rate at which that return produces zero real gain. Anything above the break-even rate means wealth is eroding in real terms.
What the result means
Primary is the break-even inflation rate. Secondary shows what real return looks like at typical inflation levels (1%, 2%, 3%, 5%) to visualise the sensitivity. The gap between your expected return and expected inflation is the real compounding rate on your money.
Why this matters more in retirement
During accumulation, real return matters but savings keep flowing. In drawdown, real return is everything — a nominal return equal to inflation means the pot stays flat-nominal but shrinks in real terms year after year, reducing the income it can support.
Quick example
With nominal return of 5%, the result is 5.00%. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
What's happening under the hood
Break-even inflation equals nominal return — the rate at which Fisher's real return formula yields zero. Tool reports this directly and shows real return at common inflation levels for sensitivity. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
Why this belongs in every plan
Nominal numbers lie on long horizons. A pot that "looks like enough" in today's money may be 30–40% short in real terms by retirement. Running inflation-adjusted calculations is the only way to compare plans fairly across decades.
What this doesn't capture
Inflation is an average across the economy; your personal inflation rate depends on what you buy. Housing, energy, and food can move very differently from headline CPI. Consider the assumption you enter as a starting point, not a guaranteed path.
The inflation rate at which your nominal return produces zero real gain is shown above.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
Break-even inflation equals nominal return — the rate at which Fisher's real return formula yields zero. Tool reports this directly and shows real return at common inflation levels for sensitivity.
Frequently Asked Questions
Why is break-even just equal to the nominal?
What if my nominal return is 0%?
Is this nominal return or net-of-fees?
Should I plan for high inflation?
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