Future cost · Purchasing power · Inflation-adjusted planning · Illustrative estimates only
Disclaimer: All projections are illustrative estimates based on the assumed rate you enter. India's actual CPI averages 5–6% historically; education and healthcare inflation can run higher. Figures do not constitute financial advice.
Inflation is the rate at which prices rise over time, which means the same amount of money buys less in the future than it does today. An inflation calculator — sometimes searched for as a "future value of money calculator" or "cost of living calculator" — projects this effect forward, showing you two related numbers:
The calculator uses standard compounding to project future cost from a present amount, an assumed inflation rate, and a time period:
| Variable | Meaning | How to find it | Example |
|---|---|---|---|
| P | Present amount or cost, in today's rupees | Your current expense or goal amount | ₹1,00,000 |
| i | Assumed annual inflation rate | India's long-term CPI average, or category-specific rate | 6% p.a. |
| n | Number of years into the future | Time left to your goal | 10 years |
Inputs: Present Amount = ₹1,00,000 | Inflation = 6% p.a. | Period = 10 years
A useful sanity check alongside the exact formula is the Rule of 72: dividing 72 by the inflation rate gives a rough number of years for prices to double. At 6% inflation, that's 72 ÷ 6 = 12 years — close to the 10-year, 1.79x result above. Once you know what a goal will actually cost in future rupees, use the SIP calculator or retirement calculator to plan how much to invest today to reach it.
The most sensitive input — a 2% difference in assumed inflation (say 6% vs 8%) can change a 20-year future cost projection by well over 40%. Always match the rate to the category: general expenses, education, or healthcare each run differently.
Inflation compounds, so the effect accelerates the longer the time horizon. Over 5 years the erosion is modest; over 25–30 years even moderate inflation can reduce purchasing power to a third or less of today's value.
Not all costs inflate at the same pace. General CPI, education, healthcare, and discretionary lifestyle spending have historically moved at noticeably different rates in India, so the category you pick materially changes the projected future cost.
The rupee gap between today's cost and the future cost scales directly with the starting amount — a bigger goal (a house down payment vs. a phone) sees the same percentage erosion, but a much larger absolute shortfall to plan for.
The right inflation assumption depends heavily on what you're planning for. These are the illustrative starting-point rates used by the calculator's category chips, based on historically observed ranges — not a live feed and not a guarantee of future inflation.
| Category | Typical Rate Range | Why |
|---|---|---|
| General CPI (everyday expenses) | 5–6% p.a. | Tracks the broad government CPI basket of food, fuel, housing and services |
| Lifestyle / Discretionary spending | 7–9% p.a. | Travel, dining out and consumer goods often outpace general CPI |
| Education | 9–12% p.a. | School and college fees are driven by skilled labour and infrastructure costs |
| Healthcare | 10–14% p.a. | Medical treatment, diagnostics and hospitalisation costs have historically risen fastest |
Future cost is calculated by compounding the present amount at the assumed annual inflation rate for the number of years in question, using the formula Future Cost = P × (1 + i)ⁿ. Because inflation compounds annually, the effect accelerates over longer time periods — a cost that doubles in 12 years at 6% inflation can triple or more over 20 years.
India's general CPI has historically averaged around 5–6% per year, which works for everyday budgeting and broad financial planning. For specific goals, use a category-matched rate instead — education costs and healthcare expenses have frequently risen at 9–14% per year, meaningfully faster than general inflation.
Future cost tells you what today's amount will cost in the future; purchasing power tells you what today's ₹1 will be worth, in today's terms, at that future date. They're calculated from the same compounding formula, just expressed in opposite directions — purchasing power is simply 1 divided by the future cost multiplier.
At 6% annual inflation, today's ₹1 is worth roughly ₹0.31 in 20 years' time, in today's terms — meaning you'd need a little over three times the current amount to buy the same goods or services two decades later. This compounding effect is why long-horizon goals need inflation-adjusted, not static, target amounts.
Education and healthcare are service-heavy sectors where costs are driven largely by skilled labor, specialized infrastructure, and technology upgrades — all of which have historically risen faster than the broader basket of goods and services that make up general CPI. This is why financial planners typically use separate, higher inflation assumptions for these two specific goals.
No — using one blanket inflation rate across very different goals tends to understate fast-rising categories. A general 6% rate works reasonably well for everyday living expenses or a retirement corpus, but education and healthcare goals are better modeled with their own higher rate to avoid underestimating the actual future cost.
The Rule of 72 is a quick mental-math shortcut: dividing 72 by the annual inflation rate gives an approximate number of years for prices to double. At 6% inflation, prices roughly double every 12 years; at 9% inflation, roughly every 8 years. It's a fast sanity check alongside the calculator's exact compounding formula.
This calculator projects forward using whatever inflation rate you enter or select — it does not pull live CPI data from MOSPI or any government source. The category presets (General CPI, Education, Healthcare, Lifestyle) are illustrative starting points based on historically observed ranges, not a guarantee of future inflation. Treat every projection as a planning estimate under a stated assumption, not a forecast.
Yes — enter today's cost of the goal, select or type an appropriate category rate (education typically runs 9–12% in India), and set the number of years until the goal. The result shows the inflation-adjusted future cost you should actually be saving or investing toward, along with a year-by-year projection.
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