Real Return Calculator

Subtracting inflation is not the same as dividing by it.

Subtracting inflation is not the same as dividing by it. Real return by the Fisher relation, with the subtraction shortcut alongside so the error is visible.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Nominal return

Inflation rate

Over how many years

Amount to convert

Real return

3.88%

The subtraction shortcut says 4.00% — out by 0.117%

Real return (Fisher)3.8835%

Nominal return7.00%

Inflation3.00%

Subtraction shortcut4%

Error in the shortcut0.1165%

Years for money to halve in value23.45

Value of that amount in 20 years' money5,536.76

Purchasing power retained55.37%

Real return is (1 + nominal) ÷ (1 + inflation) − 1, not nominal minus inflation. At ordinary rates the shortcut is close enough to pass unnoticed; at high inflation it is badly wrong, which is exactly when people reach for it. The error always runs the same way (the shortcut overstates the real return) so it flatters every projection it appears in. Over a long horizon, compounded, that overstatement is worth a substantial share of the final result. The purchasing power row is the one worth sitting with. At 3% inflation money halves in value every 23 years, which means a pension pot projected in nominal terms is showing roughly twice what it will actually buy.

How the Real Return Calculator works

Real return by the Fisher relation, with the subtraction shortcut alongside so the error is visible. The shortcut always overstates, which means it flatters every projection it appears in.

Also known as: return after inflation · is my savings rate beating inflation · inflation adjusted return calculator · how fast does inflation halve money

Where to go next

The Real Return question rarely arrives on its own. These are the ones that usually come with it:

CAGR Calculator — Not the average of the yearly returns. Never was.
Expense Ratio Calculator — 1% a year takes about a quarter of the pot over 30 years.
Sharpe Ratio Calculator — Punishes upside volatility exactly as hard as downside.
Loan & EMI Calculator — Monthly payment, total interest, and a full amortization schedule.

Sources

Not financial advice. This calculator is for planning and illustration, not financial advice. Real products carry fees, taxes, and terms it does not model. Confirm figures with your lender or a qualified adviser before committing.

Frequently asked questions

How do you calculate real return?

(1 + nominal) ÷ (1 + inflation) − 1. Not nominal minus inflation, though the two are close at low rates, which is precisely why the shortcut survives.

How wrong is the shortcut?

At 7% and 3% it overstates by about 0.12 points. At 20% and 15% it overstates by nearly a point. The error grows with both rates, and always in the same direction.

Why does real return matter more than nominal?

Because only real return tells you whether you can buy more than before. A 5% return during 5% inflation has gained you nothing, however good the statement looks.

How quickly does inflation erode money?

At 3% a year, purchasing power halves in 23 years. At 5% it halves in 14. Over a working lifetime that is the single largest factor in whether a savings plan works.

Should I use headline or personal inflation?

Your own, if you can estimate it. Headline inflation is an average basket, and someone paying rent in a hot market or running a car has a very different rate from the published figure.

Put this calculator on your own site

Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.

The one-line version

<iframe src="https://www.thecalclibrary.com/embed/real-return-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Real Return Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;margin:6px 0 0;color:#64748b">Powered by <a href="https://www.thecalclibrary.com/real-return-calculator" style="color:#64748b">Real Return Calculator</a> from The Calc Library</p>

The only condition is that the credit line below the frame stays in place. That one line is what pays for the tool being free — it is how anyone else finds it.