Calcylator
Inflation Adjusted Cost

Inflation adjusted cost:
cost today x (1 + rate) ^ years

Estimate what a purchase, fee or goal will cost in future rupees, see how fast prices compound, and avoid the usual planning errors.

Calcylator Editorial Team

Updated · 5 min read

What is an inflation adjusted cost?

An inflation adjusted cost is what something priced today is likely to cost in future, if prices rise at a steady yearly rate. At 6% inflation, an item costing Rs 50,000 today costs about Rs 89,542 after 10 years. Results are estimates, not financial advice.

Inflation compounds: each year's rise is applied to the already higher price, not the original one. That is why the gap widens in later years.

Inflation adjusted cost formula

Future cost with inflation =futureCost = todayCost x (1 + inflation / 100) ^ years
todayCost:
price today, in rupees
inflation:
assumed average yearly inflation, in %
years:
number of years ahead
The calculator uses Indian rupees and accepts an inflation rate from 0 to 30 per cent.

  • Cost today

    Rs 50,000

  • Inflation

    6% a year

  • Years

    10

  • Growth factor

    1.06 ^ 10 = 1.7908

Future cost

Rs 89,542.38

50,000 x 1.7908 = 89,542.38.

The formula has only three moving parts, so you can test cases quickly. Raise the rate and the factor climbs sharply; raise the years and it climbs even faster, because the exponent does the heavy lifting.

How the cost grows year by year

Rs 50,000 today at 6% inflation
Years aheadGrowth factorFuture cost (Rs)
51.338266,911.28
101.790889,542.38
152.39661,19,827.91
203.20711,60,356.77
254.29192,14,593.54

Between years 20 and 25 the cost rises by more than Rs 54,000, while between years 0 and 5 it rose by under Rs 17,000. The same rate does more damage on a bigger base.

Use the table to read a rough answer at once: find your years, multiply today's cost by the factor, and you have the projected figure without running the calculator.

Where this calculation is used

  • Estimating a child's college fees years before admission.
  • Setting a savings target for a wedding, a car or a home renovation.
  • Checking whether a fixed monthly allowance or rent will feel the same in future.
  • Comparing a prize or settlement paid later with today's money.

In each case the calculator gives one projected figure; real inflation varies by year and by item.

  • Course fee today

    Rs 4,00,000

  • Education inflation assumed

    8% a year

  • Years until admission

    12

Estimated future fee

Rs 10,07,268

1.08 ^ 12 is about 2.52, so the fee more than doubles. The 8% figure is an assumption, not a forecast.

Common mistakes with inflation projections

  • Entering 0.06 instead of 6. The input is a percentage.
  • Using one headline rate for everything. Education and healthcare can rise faster than the general average, so use a higher rate for them.
  • Adding rates instead of compounding. Ten years at 6% is not 60% more; it is about 79% more.
  • Ignoring that savings need to earn at least the inflation rate just to keep their buying power.

One more caution: the formula projects a price, not a salary or a return. If you want to know whether your income keeps pace, compare its yearly growth with the same inflation rate yourself.

Second example: a lower rate over a longer horizon

Rs 1,00,000 at 5% for 20 years becomes about Rs 2,65,330, a factor of 2.65. At 7% for 10 years it becomes about Rs 1,96,715. Run two or three rates to see a range rather than relying on a single guess.

A gentler 4% for 10 years turns Rs 1,00,000 into about Rs 1,48,024. Put the three results side by side and the planning question becomes clear: a few percentage points of assumed inflation change the target by lakhs.

Update your assumptions each year. If inflation turns out higher than planned, rerun the numbers with the years remaining and today's price of the item.

Common questions

How do I calculate inflation adjusted cost?

Multiply today's cost by (1 + inflation rate / 100) raised to the number of years. For Rs 50,000 at 6% for 10 years, that is 50,000 x 1.06^10 = about Rs 89,542. Treat the result as an estimate.

How much will Rs 1 lakh cost in 20 years at 5% inflation?

About Rs 2,65,330. The growth factor is 1.05 raised to 20, roughly 2.65, so a Rs 1,00,000 item would cost about 2.65 times as much. This assumes the 5% average holds every year, which real inflation rarely does.

Is inflation simple or compound?

Planning formulas treat inflation as compound: each year's increase applies to the already higher price. At 6% for 10 years the total rise is about 79%, not 60%. Simple addition understates long horizons.

What inflation rate should I use?

Choose an average that suits the expense and test a few values. The calculator allows 0 to 30 per cent. Use a higher rate for items that have historically risen faster, and compare low, medium and high cases.

Does this show what my savings will be worth?

Not directly. It projects the future price of something you plan to buy. To judge savings, compare their expected growth with the same inflation rate. This is a planning estimate, not financial advice.

Was this guide helpful?

Continue reading

View all blogs