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Real return adjusts investment gains for inflation to show the actual increase in purchasing power. The Fisher equation is exact; nominal minus inflation is the common approximation.

Công thức

Real return = Nominal return − Inflation rate (simplified); Exact: (1 + Nominal) / (1 + Inflation) − 1

Rnom: Nominal annual return (Percentage)
Rinf: Inflation rate (Percentage)
Rreal: Real return (inflation-adjusted) (Percentage)

Hướng dẫn từng bước

1Fisher: Real = (1+Nominal)/(1+Inflation) − 1
2Approximation: Real ≈ Nominal − Inflation
38% nominal at 3% inflation → 4.85% real (not 5%)
4Always compare investments using real returns

Ví dụ có lời giải

đầu vào

Nominal 8%, inflation 3%

Kết quả

Real return = (1.08/1.03)−1 = 4.85%

Câu hỏi thường gặp

Why does inflation matter?

If you earn 5% return but inflation is 3%, real wealth gain is only ~1.9% (not 2%). Over 30 years, that 1.1% difference compounds massively—huge impact on retirement plans.

Can real return be negative?

Yes. If bonds yield 3% and inflation is 4%, real return is −1%. You're losing purchasing power. Cash in high-inflation environment is a store of negative value.

How do I protect against inflation?

Equities historically beat inflation. TIPS (Treasury Inflation-Protected Securities) adjust principal for inflation. Real estate appreciates with inflation. Avoid pure cash/bonds long-term.

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