Inflation Calculator
Calculate estimated future costs and purchasing power erosion over time based on an assumed inflation rate. View Rule of 72 doubling times free in your browser.
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How to use Inflation Calculator
- 1
Enter your initial amount and choose your target currency.
- 2
Configure the expected annual inflation rate percentage.
- 3
Select your time horizon in years or pick a goal preset.
- 4
Analyze future cost equivalents, purchasing power erosion, and doubling times.
Capabilities
- Calculates future compounding costs and real purchasing power decline
- Rule of 72 and accurate logarithmic price doubling calculations
- Includes goal presets for education, healthcare, weddings, and homes
- Multi-rate scenario comparison table and yearly amortization schedule
How Inflation Affects Purchasing Power & Future Living Costs
Inflation is the gradual decrease in the purchasing power of money, reflected in the general increase in prices for goods and services over time. Understanding how compounding price increases diminish the real value of cash savings is fundamental to long-term wealth preservation and retirement planning.
Calculations represent mathematical compounding models based on constant user-entered rates. Real-world inflation rates fluctuate across economic cycles, and specific expenditure categories (such as college tuition or medical care) often inflate faster than headline consumer price indices.
Measures how much a budget target today will cost in the future: Future Value = Present Cost * (1 + r)^t. Useful for goal planning such as future home purchases, education funds, and weddings.
Measures the real purchasing power left from a fixed cash sum: Purchasing Power = Present Amount / (1 + r)^t. Demonstrates why idle cash loses real value over time.
Worked Inflation Example: $100,000 at 6% Over 10 Years
Suppose an investor holds $100,000 today and evaluates the impact of an assumed 6% annual inflation rate over a 10-year horizon:
Future Cost to Buy Same Goods: $100,000 * (1.06)^10 = $179,085 (+$79,085 increase)
Future Purchasing Power of $100,000 Cash: $100,000 / (1.06)^10 = $55,839
Real Purchasing Power Lost: $44,161 (44.16% loss in buying capacity)
Rule of 72 Doubling Time: 72 / 6 = 12 years (exact logarithmic doubling: ~11.9 years)
Result: In 10 years at 6% annual inflation, prices increase by ~79%, cutting the real worth of cash by nearly half.
To incorporate inflation compounding into post-retirement living costs and SIP targets, use Retirement Calculator.
This tool operates in a sandbox directly inside your web browser. All parsing, processing, and downloads are rendered locally. Your file size, metadata, and contents never cross the network. It works completely offline.
Frequently Asked Questions
Does this inflation calculator predict future inflation rates?
No. The calculator does not forecast future macroeconomic policy or predict economic indicators. It applies the constant annual inflation rate percentage you enter to project illustrative future costs and purchasing power erosion over your chosen time horizon.
What is the difference between future cost and purchasing power?
Future cost calculates how much money you will need in the future to purchase a basket of goods that costs a specific amount today: Future Cost = Present Cost * (1 + r)^t. Purchasing power calculates how much a fixed sum of money today will actually be worth in the future in real terms: Purchasing Power = Present Amount / (1 + r)^t.
How does the Rule of 72 apply to inflation?
The Rule of 72 is a practical mental shortcut to estimate how many years it takes for general prices to double at a given annual inflation rate. Dividing 72 by the inflation rate (e.g., 72 / 6% = 12 years) provides a close approximation of doubling time.
What annual inflation rate should I assume for long-term planning?
Long-term financial planning typically models headline inflation between 5% and 7% for emerging markets and 2% to 4% for developed economies. Specialized categories like healthcare and higher education historically experience higher inflation rates than general consumer goods.
Are my financial numbers private when using this tool?
Yes. All mathematical calculations run locally inside your browser memory; your personal savings targets and expense numbers are never transmitted or stored on any server.