What is an inflation-adjusted return?

An inflation-adjusted return — also called the real return — is your investment return after removing the effect of inflation. If your investment earned 10% nominally and inflation was 3%, your real return is approximately 6.8% (using the Fisher Equation: (1.10/1.03) − 1). Real return measures how much your actual purchasing power grew — the only metric that truly matters for long-term wealth.

What is the Fisher Equation?

The Fisher Equation is the precise formula for calculating real return from nominal return and inflation: Real Return = (1 + Nominal Return) / (1 + Inflation Rate) − 1. A common approximation is Real ≈ Nominal − Inflation, which is accurate at low rates but becomes less precise as rates rise. Our calculator uses the exact Fisher Equation for maximum accuracy.

How does inflation erode purchasing power?

Inflation reduces the real value of money over time. At 3%/yr inflation, $100,000 today has the purchasing power of only $55,367 in 20 years — a loss of nearly $45,000 in real value without spending a single dollar. Even modest inflation compounds significantly over long periods. The Purchasing Power tab models this erosion for any amount, inflation rate and time period.

What nominal return do I need to achieve a 7% real return?

At 3% inflation and 0% tax: Required Nominal = (1 + 7%) × (1 + 3%) − 1 = 10.21%/yr. At 3% inflation and 20% capital gains tax: Required Pre-Tax Nominal = 10.21% / (1 − 20%) = 12.76%/yr. Our Required Return tab calculates this automatically for any combination of real target, inflation and tax rate, and compares the result against historical asset class benchmarks.

Why does the same investment produce different real returns in different countries?

Real return depends on local inflation, not just the nominal return. If your investment earns 10% nominally, a Swiss investor at 1.5% inflation earns 8.4%/yr real, while an Argentine investor at 140% inflation suffers a deeply negative real return on the same nominal gain. The Global Compare tab shows this difference across 12 countries simultaneously.

Is the inflation-adjusted return calculator free?

Yes. The Inflation-Adjusted Return Calculator Pro on StockToolHub is completely free with no registration or account required.

Inflation-Adjusted Return Calculator Pro — Real Return & Purchasing Power

Investment Details

Nominal Annual Return

%/yr

S&P 500 historical nominal avg ≈ 10%

Annual Inflation Rate

%/yr

US long-run avg ≈ 3% · Current CPI varies

Initial Capital

Period

Tax Rate (optional)

Applied before inflation adjustment

Real Annual Return (After Inflation)

—

Enter nominal return and inflation rate

Nominal Return

—

After-Tax Nominal

—

Inflation Drag

—

Real Return (precise)

—

Nominal Final Value

—

Real Final Value

—

💰 —

Nominal vs Real Portfolio Growth

What each tab calculates

Real Return

Convert any nominal return to a true inflation-adjusted real return using the Fisher Equation. Includes optional tax adjustment, final value comparison in nominal and real terms, and a verdict on whether you are genuinely growing wealth.

Purchasing Power

Model how inflation erodes the real value of cash or savings over time. Shows purchasing power lost, percentage eroded, milestones at 10, 20 and 30 years, and how a savings interest rate compares to inflation.

Required Return

Reverse-engineer the nominal return you need to achieve any real return target, accounting for both inflation and your marginal tax rate. Compares your required return against historical asset class benchmarks.

Global Compare

See how the same nominal return produces different real wealth across 12 countries with different inflation environments — from Switzerland's 1.5% to Argentina's extreme inflation — ranked by after-inflation real gain.

Inflation-Adjusted Return Pro

What each tab calculates

Real Return

Purchasing Power

Required Return

Global Compare