Inflation Calculator
See how inflation erodes your purchasing power over time.
Amount & Inflation
Historical Rates: US average ~3%, High inflation 6-8%, Low inflation 1-2%
Future Purchasing Power
$55,368
in today's dollars after 20 years
Purchasing Power Over Time
Cumulative Inflation: 80.6% over 20 years. Prices will be 1.81x higher.
What is Inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time, causing purchasing power to fall. When inflation occurs, each unit of currency buys fewer goods and services.
How inflation affects you:
- Purchasing power: $100 today buys less in the future
- Savings erosion: Money in low-yield accounts loses value
- Investment returns: Must exceed inflation for real gains
- Retirement planning: Future expenses will be higher
Causes of inflation:
- Demand-pull: More money chasing same goods
- Cost-push: Production costs increase
- Monetary policy: Central bank money supply
- Supply shocks: Disruptions to production
How Inflation is Measured
Consumer Price Index (CPI):
- Most common inflation measure
- Tracks prices of a "basket" of goods and services
- Published monthly by Bureau of Labor Statistics (US)
- Includes food, housing, transportation, healthcare
Other inflation measures:
- Core CPI: Excludes volatile food and energy
- PCE (Personal Consumption Expenditures): Fed's preferred measure
- PPI (Producer Price Index): Wholesale prices
- GDP Deflator: Broadest measure
Historical US inflation:
- Long-term average: ~3% per year
- 1970s high inflation: 10-14%
- 2000s-2010s low: 1-2%
- Post-2021: Elevated at 5-8%
Inflation Calculation Formulas
Understanding how inflation affects values over time:
Future Value with Inflation
Where:
- Present Cost= Today's price of an item
- inflation rate= Annual inflation rate (as decimal)
- years= Number of years in the future
Purchasing Power Calculations
Future purchasing power of today's money:
Purchasing Power = Amount / (1 + inflation rate)^years
Real vs. Nominal Returns:
Real Return = Nominal Return - Inflation Rate
(Approximate formula; Fisher equation is more precise)
Fisher Equation (precise):
Real Rate = [(1 + Nominal Rate) / (1 + Inflation Rate)] - 1
Example:
If your investment earns 8% and inflation is 3%:
- Approximate real return: 8% - 3% = 5%
- Precise real return: (1.08/1.03) - 1 = 4.85%
How to Use This Calculator
Our inflation calculator helps you understand money's changing value:
- Calculate Future Cost:
- Enter current price
- Set expected inflation rate
- Choose future time period
- See what it will cost
- Calculate Purchasing Power:
- Enter amount of money
- Set expected inflation
- See future buying power
- Calculate Real Returns:
- Enter investment return
- Enter inflation rate
- Get inflation-adjusted return
Results include:
- Future cost projections
- Purchasing power loss
- Real returns
- Year-by-year breakdown
Investment Strategies to Beat Inflation
Investments that typically beat inflation:
- Stocks: Historical 7-10% returns (4-7% real)
- Real Estate: Property values and rents tend to rise with inflation
- TIPS: Treasury Inflation-Protected Securities
- I-Bonds: Savings bonds that adjust for inflation
- Commodities: Gold, oil often hedge inflation
Investments that may lag inflation:
- Traditional savings accounts (1-2%)
- CDs in low-rate environments
- Long-term fixed bonds during rising inflation
- Cash held outside accounts
Retirement planning tip:
Plan for 3% average inflation. If you need $50,000/year now, plan for ~$90,000/year in 20 years.
Worked Examples
Future Cost Calculation
Problem:
College costs $30,000/year today. What will it cost in 18 years at 5% education inflation?
Solution Steps:
- 1Present Cost = $30,000
- 2Inflation Rate = 5% = 0.05
- 3Years = 18
- 4Future Cost = $30,000 × (1.05)^18
- 5Future Cost = $30,000 × 2.407
- 6Future Cost = $72,210
Result:
College will cost approximately $72,210/year in 18 years - more than double today's cost.
Purchasing Power Loss
Problem:
You have $100,000 in savings. What will it be worth in 10 years at 3% inflation?
Solution Steps:
- 1Amount = $100,000
- 2Inflation = 3% per year
- 3Years = 10
- 4Purchasing Power = $100,000 / (1.03)^10
- 5Purchasing Power = $100,000 / 1.344
- 6Purchasing Power = $74,409
Result:
Your $100,000 will only buy $74,409 worth of today's goods in 10 years. That's a 26% loss in purchasing power.
Real Investment Returns
Problem:
Your investment earned 10% this year. Inflation was 4%. What's your real return?
Solution Steps:
- 1Nominal Return = 10% = 0.10
- 2Inflation Rate = 4% = 0.04
- 3Approximate Real Return = 10% - 4% = 6%
- 4Precise (Fisher): (1.10/1.04) - 1 = 5.77%
Result:
Your real return is approximately 5.77%. While you earned 10% nominally, after accounting for inflation, your actual purchasing power increased by only ~6%.
Tips & Best Practices
- ✓Always calculate real (inflation-adjusted) investment returns
- ✓Use 3% inflation for long-term planning, but test with 4-5% scenarios
- ✓Healthcare and education typically inflate faster than general CPI
- ✓Retirement needs should be planned in today's dollars, then inflated
- ✓Keep some investments in inflation-hedging assets (stocks, real estate, TIPS)
- ✓Review and adjust retirement projections periodically for actual inflation
- ✓Don't keep excessive cash - it loses value every year
Frequently Asked Questions
Sources & References
Last updated: 2026-01-22