Inflation Explained: Future Cost, Purchasing Power and Calculator Assumptions

Inflation changes what an amount of money can represent

Inflation describes a rise in the general price level over time. In practical terms, a cost may require more rupees in the future, while the same nominal amount of money may represent less purchasing power.

The Inflation Calculator turns an entered amount, assumed annual inflation rate and whole-year period into a controlled scenario. It does not retrieve live CPI data or predict the future price of a particular item.

Future cost and purchasing power answer different questions

Future cost grows today's cost by the annual inflation assumption. Purchasing-power mode divides the entered amount by the same compounded factor. The two values are related, but they should not be treated as interchangeable answers.

Worked example: ₹1,00,000 at an assumed 6% for 10 years

Both rows below use ₹1,00,000, an illustrative constant annual inflation assumption of 6% and a 10-year period. The 6% input is not India's current CPI, an inflation forecast, a guaranteed future rate or an investment return.

Read each result in the context of its mode

The future-cost result says that a ₹1,00,000 cost becomes about ₹1,79,084.77 in this constant-rate model. It does not forecast the price of a named product or service.

The purchasing-power result does not reduce a ₹1,00,000 bank balance to ₹55,839.48. It estimates what the original nominal amount could represent later under the entered assumption.

See the dedicated explanations of future cost and purchasing power for the two interpretations.

The calculator compounds one entered rate annually

The engine uses one constant rate for every whole year. Each year's modeled price change becomes part of the base for the next year, so the effect accumulates rather than adding the same rupee amount each year.

The generic growth-on-growth idea is covered in What Is Compound Interest?. Here, the calculation is being used to model prices and purchasing power, not interest earned on an investment.

A constant-rate result is a scenario, not a forecast

Actual inflation varies, and different goods, services and household spending patterns need not change at the same rate. The calculator does not model a changing annual path, monthly periods or a personal consumption basket.

Read why Inflation Calculator results are only projections, or test another assumption in the Inflation Calculator.