Inflation Calculator
See how inflation changes future costs and purchasing power with the WealthCalcLab inflation calculator.
Updated April 5, 2026
What this calculator does
This inflation calculator estimates how a price or budget amount changes over time when inflation compounds year after year.
Inflation is one of the easiest planning factors to underestimate because the annual percentage often looks modest. Over long periods, however, those yearly increases materially reshape savings goals, retirement needs, and spending power.
The calculator shows both sides of the same effect: how much more something may cost in the future and how much less a fixed amount of money may buy.
How to use it
Enter the amount you want to analyze, the annual inflation rate, and the number of years.
Use the future cost figure when planning future expenses or required savings targets.
Use the purchasing power figure when checking how far a fixed nominal amount may stretch in the future.
Formula
Future cost = Amount × (1 + inflation)^yearsPurchasing power = Amount ÷ (1 + inflation)^yearsThese formulas describe the same inflation effect from opposite directions: rising nominal prices and falling real purchasing power.
Methodology
Future cost is calculated by compounding the amount forward by the inflation rate for the selected number of years.
Purchasing power is calculated by discounting the amount by the same rate over the same horizon.
The yearly table makes the erosion visible rather than leaving the result as one abstract number.
Worked example
An item that costs 1,000 today may cost materially more in ten years if inflation averages 3% each year.
That same example also shows why a cash balance sitting still in nominal terms quietly loses real buying power over time.
How to interpret the results
Future cost helps with goal setting. Purchasing power helps with real-value thinking when you already have a nominal amount in mind.
Inflation multiple shows how many times larger the future nominal price becomes relative to today’s amount.
Common mistakes
- Ignoring inflation when planning retirement or long-term savings goals.
- Using an unrealistically low inflation assumption for long horizons.
- Thinking of inflation as a one-time price jump rather than a compounding process.
Key terms
Quick definitions for the finance terms that matter on this page.
Purchasing power
The amount of goods or services a given amount of money can buy.
Real value
The value of money after adjusting for inflation.
Frequently asked questions
Clear answers on assumptions, interpretation, and the limits of each estimate.
Why does inflation matter so much over long periods?
Because inflation compounds. Small annual increases can add up to large cumulative changes over a decade or more.
Can this calculator predict actual future inflation?
No. It models a constant assumed rate so you can plan scenarios, not forecast exact future inflation.
Should I use current headline inflation?
Not necessarily. For long-term planning, a conservative long-run assumption is often more useful than a single recent reading.
Is future cost the same as required investment return?
No. Future cost shows how expenses may rise. Required return depends on your saving horizon, contributions, and risk tolerance.
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Important disclaimer
Calculator outputs are estimates only and should not be treated as financial, tax, legal, or investment advice.