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See how inflation erodes purchasing power over time — or how much money you’ll need in the future to match today’s value. Instant, accurate, and visually clear.

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Choose your calculation direction, enter an amount and year range, and see how purchasing power changes instantly.

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Purchasing power retained

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📈 Value over time (inflation-adjusted)

💡 Inflation insights:
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ℹ️ Note: This calculator provides estimates for informational and educational purposes only and is not financial advice. Results are based on the figures you enter and standard formulas; actual outcomes vary. Always verify important financial decisions with a qualified professional.

Inflation Calculator: Measure Purchasing Power Over Time

A dollar today buys less than a dollar bought ten years ago. A dollar ten years from now will buy less than today’s dollar. This steady erosion of purchasing power is called inflation, and understanding it is fundamental to making sound financial decisions — from saving for retirement to evaluating salary increases to pricing products for a business. This free inflation calculator lets you see exactly how any amount of money changes in real value over any time period, using either historical CPI data or a custom inflation rate.

Quick example: S$10,000 in 2000 had the purchasing power equivalent of approximately S$17,800 in 2025 — meaning what cost S$10,000 in 2000 costs roughly S$17,800 today. Conversely, S$10,000 in cash held from 2000 would only buy S$5,600 worth of 2000-era goods today. Use the calculator above to model any amount across any time period.

What Is Inflation?

Inflation is the rate at which the general price level of goods and services rises over time — and correspondingly, the rate at which the purchasing power of money falls. When inflation is 3% per year, something that cost S$100 this year will cost approximately S$103 next year and S$134 in ten years.

Inflation is measured by tracking a basket of goods and services that represents typical consumer spending — this is called the Consumer Price Index (CPI). Central banks like the US Federal Reserve, the European Central Bank, and the Monetary Authority of Singapore (MAS) monitor CPI and typically target an inflation rate of around 2% per year as a balance between economic growth and price stability.

How Inflation Affects Your Money

Inflation affects every aspect of personal finance:

Savings: Money sitting in a low-interest account loses real value every year if interest earned is below the inflation rate
Salaries: A pay rise below the inflation rate is effectively a real pay cut — your nominal income increased but purchasing power decreased
Investments: Returns must be evaluated in real terms — a 4% investment return in a 5% inflation environment is a negative real return
Debt: Inflation actually benefits borrowers — you repay loans with money that is worth less than when you borrowed it
Retirement: A retirement fund of S$1 million will buy significantly less in 30 years than it would today

How to Calculate Inflation: Formula Explained

Future value formula (inflation-adjusted):
Future Value = Present Value × (1 + r)^n

Where r = annual inflation rate (decimal) and n = number of years

Example: S$10,000 today at 3% inflation over 20 years:
Future Value = 10,000 × (1.03)^20 = 10,000 × 1.8061 = S$18,061

This means you’ll need S$18,061 in 20 years to have the same purchasing power as S$10,000 today. Alternatively, S$10,000 saved today with no growth will only buy S$5,537 worth of today’s goods in 20 years.

Historical Inflation Trends

Decade	Avg US CPI inflation	Key drivers
1960s	~2.5%	Post-war growth, relatively stable prices
1970s	~7.1%	Oil crises (1973, 1979), stagflation
1980s	~5.6%	Fed rate hikes to fight 70s inflation, then easing
1990s	~3.0%	Globalisation, tech productivity gains
2000s	~2.6%	Housing boom, energy prices, GFC
2010s	~1.8%	Post-GFC recovery, low commodity prices
2020–2023	~5.4%	COVID supply disruption, energy shock, stimulus
2024–2025	~2.8%	Disinflation, rate normalisation

What Is a Good Inflation Rate?

Most central banks target 2% annual inflation as the ideal balance. At this rate, economic growth is supported (mild inflation encourages spending over hoarding) while purchasing power erosion is gradual enough to plan around. Deflation (negative inflation) is considered more dangerous than mild inflation because it encourages delayed spending, which contracts economic activity.

At 2% inflation: prices double approximately every 36 years. At 4%: every 18 years. At 7%: every 10 years. This is why the 1970s felt so economically destabilising — a decade of 7% average inflation cut the purchasing power of money roughly in half.

Real vs Nominal Value Explained

This distinction is critical in financial analysis:

Nominal value: The face value of money — what a number says. Your salary of S$5,000/month is a nominal figure.
Real value: What that money can actually buy, adjusted for inflation. If prices rose 10% over a year, your S$5,000 salary only has the real purchasing power of last year’s S$4,545.

When evaluating investment returns, GDP growth, wage increases, or savings interest rates, always ask whether the figure is real or nominal. A savings account paying 2% interest in a 4% inflation environment has a negative real return of −2%.

How to Protect Against Inflation

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Equity investments

Stocks have historically returned 7–10% annually (nominal) — well above long-term inflation rates. Broad index funds provide low-cost exposure to equity growth that outpaces inflation over multi-decade horizons.

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Real estate

Property values and rents historically track or exceed inflation. Direct ownership provides an inflation-linked asset with additional leverage benefits and rental income streams.

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Inflation-linked bonds

Instruments like TIPS (US), linkers (UK), or Singapore Savings Bonds (SSB) adjust their principal or interest with CPI — guaranteeing a real return regardless of inflation rate.

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Commodities & gold

Gold has historically preserved purchasing power over very long periods. Commodities broadly track inflation since they are the inputs behind CPI itself. Useful as a portfolio hedge, though volatile in the short term.

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Increase earning power

The most reliable inflation hedge is growing your human capital — skills, qualifications, and professional value that command salary growth exceeding inflation. Regular salary negotiation anchored to CPI data is essential.

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High-yield savings

In high-rate environments, money market funds, T-bills, and high-yield savings accounts can approach or exceed inflation rates — providing low-risk real return preservation during periods of elevated interest rates.

Related Financial Tools

Frequently Asked Questions

What is an inflation calculator?

An inflation calculator converts a monetary amount from one time period to another, adjusting for the change in purchasing power due to inflation. It uses either historical CPI (Consumer Price Index) data or a custom inflation rate to apply the compound inflation formula: Adjusted Value = Original Amount × (1 + r)^n, where r is the annual rate and n is the number of years. The result shows what an amount of money in one year is equivalent to in purchasing power in another year.

How much has inflation reduced purchasing power since 2000?

Based on US CPI data, cumulative inflation from 2000 to 2025 is approximately 80–90%. This means S$100 in 2000 has the purchasing power of roughly S$180–190 in 2025 — conversely, S$100 held in cash since 2000 can only buy approximately S$54 worth of 2000-era goods today. Use the calculator above with your local currency to model your specific scenario. Singapore’s inflation over the same period was more moderate at around 50–60% cumulative.

What is CPI and how is it calculated?

CPI (Consumer Price Index) tracks the price of a fixed “basket” of goods and services that represents average household consumption — including food, housing, transport, healthcare, clothing, and entertainment. Statistical agencies (like the US Bureau of Labor Statistics or Singapore’s Department of Statistics) survey prices monthly and compute the weighted average change. The result is published as a percentage — the annual inflation rate. Different countries calculate CPI differently, with different basket compositions, which is why global inflation rates are not directly comparable.

Does inflation affect investments differently than cash?

Yes — dramatically. Cash loses purchasing power at exactly the inflation rate. A savings account earning less than inflation also loses real value, just more slowly. Equities, property, and businesses with pricing power can raise revenues with inflation, often delivering real returns above inflation over time. The key measure is the “real return” = nominal return minus inflation rate. A 6% investment return in a 3% inflation environment delivers a 3% real return — that’s genuine wealth creation. The same 6% return in a 7% inflation environment is a −1% real return — you’re losing wealth in purchasing power terms despite nominal gains.

What inflation rate should I use for retirement planning?

For long-term retirement planning, most financial planners use 2.5–3.5% as a conservative inflation assumption for developed markets. Singapore’s long-run average is approximately 2.0–2.5%. Healthcare costs typically inflate faster than general CPI (3–5% annually), so retirement plans should account for elevated medical expense inflation in later years. It’s prudent to run scenarios at both a low rate (2%) and a high rate (4–5%) to stress-test your retirement projections. Use the calculator above in “Present → Future” mode to see how much you’ll need at retirement.

How does inflation affect debt and mortgages?

Inflation is actually beneficial for borrowers. When you take a fixed-rate mortgage or loan, the principal and payments are fixed in nominal terms — but inflation gradually erodes the real value of what you owe. A S$300,000 mortgage taken at 3% inflation means that in 10 years, you’re repaying with dollars worth about 26% less in purchasing power. This is a primary reason why property — purchased with mortgage leverage — is such a powerful inflation hedge. Governments with large public debts similarly benefit from inflation, which reduces the real cost of their debt obligations.

What is “real” vs “nominal” interest rate?

Nominal interest rate is the stated rate (e.g., 5% on a savings account). Real interest rate = Nominal rate − Inflation rate. More precisely, using the Fisher equation: Real Rate = (1 + Nominal Rate) / (1 + Inflation Rate) − 1. If your savings account pays 4% nominal and inflation is 3%, your real return is approximately 1%. This 1% real return is your actual increase in purchasing power. If inflation exceeds your nominal return, you have a negative real interest rate — your money is losing real value despite earning nominal interest.

Why does the central bank target 2% inflation?

The 2% target reflects a balance between two risks: too little inflation (deflation risk — where people delay purchases expecting lower prices, contracting economic activity) and too much inflation (which destroys purchasing power and creates economic uncertainty). At 2%, money loses half its purchasing power roughly every 36 years — slow enough to plan around, while maintaining enough price-level flexibility for monetary policy to function. It’s also a buffer above zero — leaving room for central banks to cut rates without hitting the “zero lower bound” problem that occurred after the 2008 financial crisis.

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