Real Return Calculator
Compute real (inflation-adjusted) investment returns via the Fisher equation. See how much purchasing power actually grows vs nominal illusion.
Real Return Calculator
Year-by-year projection
Real return across asset classes
How to use the Real Return Calculator
Enter your investment + horizon
The principal you're starting with, and how many years it'll compound. Longer horizons make the difference between real and nominal returns much more dramatic.
Set the nominal return
This is the headline percentage. Long-term S&P 500 averages ~10% nominal. Bonds ~5-6%. Cash/T-bills ~3-4%. Use realistic forward-looking numbers, not last year's specific result.
Set the inflation rate
3% is the US long-term average. 2% is the typical central-bank target. Singapore runs lower (1.5-2.5%); ASEAN varies 3-6%. For stress-testing, run multiple inflation scenarios to see how much your real return changes.
Read both Fisher exact + approximation
Fisher exact uses (1+nom)/(1+infl)−1. The approximation (nominal − inflation) is close but slightly overstates real return at high rates. At 8% nominal + 3% inflation, exact = 4.85%, approx = 5%. The gap matters more at higher rates.
Real return — the only return that matters for purchasing power
Nominal return is the percentage your investment grows in dollar terms. Real return is what's left after inflation erases part of that growth. Only real return tells you how much MORE STUFF you can buy at the end than at the start — which is what investing for the long term is actually about. A 10% nominal return in 8% inflation is only 2% real. A 5% nominal return in 1% inflation is 4% real — twice as much actual wealth creation despite the lower headline number. Confusing the two is the most common mistake in personal finance.
The Fisher equation
Irving Fisher's 1930 formulation: (1 + real) = (1 + nominal) / (1 + inflation), solved for real = ((1 + nom) / (1 + infl)) − 1. The common shorthand "real = nominal − inflation" is an approximation that works well at low rates (under 5%) but drifts at higher rates. At 10% nominal + 8% inflation, the approximation gives 2%; Fisher exact gives 1.85% — small at first glance, but compounded over 30 years, it's a 7-8% difference in final purchasing power. For ASEAN-stage investors where both rates run higher, always use the exact equation.
"A 10% return in 8% inflation is only 1.85% real — not 2%. The Fisher equation matters most when both numbers are large." — every honest financial planner
The APAC investor's real-return reality
Singapore's typical 7-8% Straits Times Index return against 2% local inflation produces 5-6% real return — strong by global standards. Malaysia's KLCI averages similar nominal returns against 2-3% inflation. Indonesia's JKSE has posted 10-15% nominal in many years but against 4-6% inflation, real returns land at 5-9%. Vietnam's VN-Index has produced spectacular nominal returns (20%+ in good years) but historical inflation of 8-15% means real returns are much more modest. The Philippines' PSEi has run similarly mixed. Across the region, the message is consistent: judge investments by real returns, not nominal — especially when inflation is volatile.
Why this matters for retirement
Retirement spans 25-40 years. Inflation compounds at 2-4% annually in most developed markets. A retirement portfolio earning 4% real (e.g., 7% nominal at 3% inflation) supports a 4% safe withdrawal rate sustainably. A portfolio earning 0% real (e.g., 3% nominal at 3% inflation) cannot — you'd be drawing down principal in real terms even without spending it. Every retirement model that uses real returns rather than nominal is the realistic one. Every model that confuses the two undershoots required savings by 20-40%.
10 Things to Know About Real Returns
The S&P 500's long-term real return is ~7% per year (10% nominal − 3% inflation), averaged over 100+ years. That's the headline number behind every FIRE projection.
The Fisher equation (Irving Fisher, 1930) is exact: (1+real) = (1+nom) / (1+infl). The "real = nom − infl" shorthand is only accurate at low rates.
T-bills (US Treasury short-term) typically deliver 0-1% real return. Their job is preservation, not growth — they barely keep pace with inflation.
The "safe withdrawal rate" in FIRE math (4% rule) assumes a portfolio earning ~4% real over time. Without real-return analysis, the 4% rule makes no sense.
Real return on US bonds since 1928: ~2% annually. Real return on cash: ~0.5%. Real return on US stocks: ~7%. That's the canonical case for equity over fixed income for long-horizon savers.
In 1980, US bond yields hit 15% nominal but inflation was 14% — so real return was just 1%. The "high-yield" period was largely illusory.
Emerging-market stocks often post 12-15% nominal but against 5-8% inflation — real returns land similar to developed markets despite the "exciting" headlines.
Real-return analysis is mandatory for TIPS (Treasury Inflation-Protected Securities), I-Bonds, and any inflation-linked fixed income — these securities explicitly pay a real coupon.
Mortgage debt has a negative real cost when inflation exceeds your fixed mortgage rate — you pay back in cheaper future dollars. A 3% fixed mortgage in 5% inflation has a −2% real cost.
The 2022-2024 period saw nominal returns disconnect dramatically from real returns — many "double-digit gains" were actually 0-3% real after the 6-9% inflation peak.
Frequently Asked Questions
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Fisher exact: (1+nom)/(1+infl) − 1. Approximation: nom − infl. At low rates the two are nearly identical. At 5% nom + 3% infl, exact = 1.94%, approx = 2% — close. At 15% nom + 10% infl, exact = 4.55%, approx = 5% — meaningful difference. Always use exact for serious financial planning.
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Because the nominal gain itself gets inflation-eroded. If you grow $100 to $110 (10% gain) but prices also rose 8%, the $110 only buys what $101.85 bought before. You gained ~1.85% in purchasing power, not the headline 10%. The exact formula captures this compounding interaction; the approximation ignores it.
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For long-term planning (retirement, FIRE, college savings): yes, always real returns. They represent actual purchasing power. For short-term cash flow modelling (next 1-2 years): nominal is fine. The longer the horizon, the more critical real returns become — over 30 years, even 2% inflation cuts purchasing power by ~45%.
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The Trinity Study's 4% rule is calibrated against historical REAL returns. The 4% you withdraw each year is inflation-adjusted (4% of starting portfolio, then growing with CPI). The rule works because long-term real returns on a 60/40 portfolio (~4-5%) match the inflation-adjusted withdrawals. Nominal-return-based withdrawal plans systematically underestimate sustainable withdrawal amounts.
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The honest answer is "we don't know." US long-term average is 3%. Central-bank targets are 2%. 2021-2024 saw spikes to 9%. Conservative planners use 3-4%. Optimistic planners use 2-2.5%. Run your model at multiple assumptions and accept that the future will surprise you in both directions.
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Yes, when inflation exceeds nominal return. Cash in a savings account at 0.5% in 5% inflation has a −4.3% real return — losing purchasing power every year despite the nominal number going up. T-bills during the 2022-2024 inflation spike had negative real returns for the first time in decades. Negative real returns are why "safe" assets aren't safe in high-inflation regimes.
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Yes. Real return math is dimensionless. Enter the nominal return in any currency, the inflation rate for that currency's country, and the formula gives correct real return. SGD + Singapore CPI, MYR + Malaysian CPI, JPY + Japanese CPI, etc.
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Strictly: yes, real after-tax return is the most honest number. Practical approach: handle tax separately. Compute real return first, then apply your marginal tax rate to the GAIN (not the principal). For tax-advantaged accounts (401k, IRA, SRS, CPF), use pre-tax real return.
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For long-term equity-heavy portfolios: 5-7% real is achievable historically. For 60/40 balanced: 3-5% real. For conservative bond-heavy: 1-3% real. Below 2% real, you're not really growing wealth — just keeping up with inflation. Above 7% real long-term is fantastic and rare.
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No. All calculation happens entirely in your browser via JavaScript. Open DevTools → Network and watch — there's zero outbound traffic.
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