Real Rate of Return Calculator
S&P 500 30-yr ~10.1%; HYSA ~4%; conservative 7%.
BLS CPI March 2026 YoY: 3.3%; long-term US average ~3.0%.
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How to use
- 1 Enter nominal return (your account's stated APY or expected annual return). Examples: HYSA 4.5%, S&P 500 long-term 10%, Treasury bond 4%.
- 2 Enter expected inflation rate. The Federal Reserve targets 2%; actual long-term US average is 2.5–3%. The Bureau of Labor Statistics CPI release is the official source.
- 3 Click Calculate to see the exact real rate using the Fisher equation, plus an approximate real rate using the simple subtraction (nominal − inflation), which differs slightly.
- 4 Use the real rate for retirement planning — Social Security and most pensions adjust for inflation, but most personal savings do not unless invested in TIPS or stocks.
- 5 Compare investments on real return, not nominal. A 7% nominal return in 5% inflation (1.9% real) loses to a 5% return in 1% inflation (4.0% real).
About Real Rate of Return Calculator
FAQ
Q What is the real return on a 5% HYSA at 3% inflation?
Using the Fisher equation: (1.05 / 1.03) − 1 = 1.94% real return. The simple approximation (5% − 3% = 2%) is close but slightly overstates. So in real terms, your $100,000 grows to $101,940 in purchasing power, not $105,000 — inflation eats most of the nominal gain.
Q What is the long-term real return of the S&P 500?
About 7% real (10% nominal minus 3% average inflation), based on data from 1928–2024 published by Robert Shiller and validated by NYU Stern School of Business. This 7% real return is the basis for the Trinity Study's 4% safe withdrawal rate and most US retirement planning.
Q How does the Fisher equation differ from simple subtraction?
The Fisher equation accounts for the multiplicative effect: (1+nominal) = (1+real) × (1+inflation). Simple subtraction (real ≈ nominal − inflation) is accurate within 0.1% at low rates, but understates the true real rate at higher rates. At 10% nominal and 5% inflation, exact = 4.76% real, simple = 5.0%.
Q How do I protect my savings from inflation?
Three main vehicles: (1) Treasury Inflation-Protected Securities (TIPS) — guaranteed real return; (2) I-bonds (max $10K/year per person) — inflation-linked; (3) stocks — long-term real returns of 6–7% historically. Cash and traditional bonds lose purchasing power in inflationary periods.
Q What inflation rate should I assume for retirement planning?
3% is the standard planning assumption — slightly above the Federal Reserve 2% target to provide margin of safety. Long-term US average since 1913 is 3.1%. CPI-E (for adults 62+) tends to run 0.2–0.3% higher due to greater healthcare weighting. For 30-year planning, 3% is the conservative middle.
Q Are gold and crypto good inflation hedges?
Mixed evidence. Gold has historically tracked inflation over very long periods (50+ years) but underperforms stocks in real terms, with high volatility. Bitcoin is too new (2009) to draw conclusions; correlation with inflation has been weak in 2021–2024 despite the narrative. TIPS are the only true inflation hedge by design.
Q Why are bond returns so low in real terms?
Bonds offer interest in exchange for credit risk over a term. The market prices them so that long-term real returns approximate the time value of money — about 1–2% above inflation for safe Treasuries. Investors accepting bond returns implicitly accept that real return as compensation for low volatility.
Q What is the difference between CPI-U and PCE inflation?
CPI-U (BLS) is the headline inflation measure most consumers know — it tracks a fixed basket of goods. PCE (BEA) is the Federal Reserve's preferred inflation measure — it adjusts the basket as consumers substitute goods. PCE typically runs 0.3–0.5 percentage points lower than CPI-U.
Official resources
BLS — Consumer Price Index (CPI)
Bureau of Labor Statistics official US inflation data — monthly CPI-U release.
Federal Reserve — Inflation Expectations
Federal Reserve research on inflation measurement and expectations.
TreasuryDirect — TIPS and I-Bonds
Official US Treasury source for inflation-protected savings bonds and TIPS.
BEA — Personal Consumption Expenditures (PCE)
Bureau of Economic Analysis PCE — the Federal Reserve's preferred inflation gauge.