Inflation Calculator

What inflation means for your money

Inflation is the rate at which the general level of prices for goods and services rises over time, which simultaneously erodes the purchasing power of money. If inflation is 6% per year, something that costs ₹100 today will cost approximately ₹338 after 20 years. Conversely, ₹100 received 20 years from now is worth only about ₹30 in today's purchasing power.

This is not just an abstract economic concept — it directly impacts financial planning. A retirement corpus that looks adequate today may not maintain the same standard of living decades hence if inflation has been running above the returns on the investments funding that corpus. The gap between nominal returns and inflation-adjusted (real) returns is the single most underappreciated risk in long-term financial planning.

The math of compound inflation

Just like compound interest grows wealth exponentially, compound inflation erodes it exponentially. The formula is:

And in reverse (present value of a future amount):

The rule of 72 is a quick mental shortcut: divide 72 by the inflation rate to get the approximate number of years it takes for prices to double. At 6% inflation, prices double in about 12 years (72 ÷ 6 = 12). At 8%, prices double in 9 years.

Indian CPI inflation — historical context

India has gone through multiple distinct inflation regimes over the past three decades. The 1990s and early 2000s saw bouts of high CPI inflation driven by food price shocks and supply-side constraints. The period between 2009 and 2014 was particularly challenging, with CPI running above 9% for extended stretches, driven by rising food prices (especially vegetables and protein-based items) and administered fuel prices.

The adoption of a formal inflation targeting framework by the RBI in 2016 brought greater discipline. Since then, CPI has generally stayed within the 2-6% tolerance band, though food inflation spikes — especially in vegetables like onions and tomatoes — continue to cause periodic headline volatility. Core inflation (excluding food and fuel) has been more stable, typically running at 4-5.5%.

For long-term financial planning purposes, using 5-7% as an illustrative annual inflation assumption is reasonable based on historical experience, with the understanding that future inflation depends on policy, supply conditions, and global commodity cycles.

Inflation and retirement planning

Inflation has an outsized impact on retirement planning because of the long time horizons involved. Consider a 30-year-old planning to retire at 60 with a monthly expense of ₹50,000 in today's money. At 6% annual inflation, those same expenses will cost approximately ₹2.87 lakh per month in 30 years. The retirement corpus needed to sustain that lifestyle — at a 4% withdrawal rate — would be approximately ₹8.6 crore in nominal terms. Planning for the corpus in today's numbers without inflating forward is a common and consequential error.

The useful concept here is the real rate of return — the return above and beyond inflation. If your investment earns 10% nominal and inflation is 6%, your real return is approximately 4% (technically: (1.10/1.06) − 1 ≈ 3.77%). Compounding at the real rate of return and planning for inflation-adjusted expenses in real terms gives a more honest picture.

Categories of spending most affected by inflation

Not all expenses inflate at the same rate. The CPI basket assigns weights to different categories, and their inflation rates can vary substantially:

• Healthcare and medical expenses have historically inflated faster than headline CPI in India — medical inflation is often estimated at 10-15% per year, making it a key planning variable for retirees.
• Education costs have also risen steeply, particularly for private schools and professional colleges, often at 8-12% per year.
• Food inflation is volatile due to monsoon dependence and supply chain factors, but the long-run trend follows the broader CPI.
• Consumer electronics and technology have often experienced price decreases in real terms due to productivity gains — a rare deflating category.

When modelling your specific inflation exposure, consider using a higher rate (8-10%) for healthcare and education buckets if those are significant parts of your future spending.

Inflation-hedging instruments in India

Various instruments are available in India that offer inflation-linked or inflation-beating characteristics:

• Equity: Historically, equity returns in India have exceeded inflation over long periods, though with significant year-to-year variability.
• Real Estate: Property prices have historically kept pace with or exceeded inflation in urban India, though liquidity is poor and holding costs are significant.
• Gold: Gold is often considered an inflation hedge. Historical data shows it preserves purchasing power over very long periods, though it can underperform for extended stretches.
• Inflation-Indexed Bonds: RBI has issued Capital Indexed Bonds and Inflation Indexed National Savings Securities at various times, though their availability has been intermittent.

This page is educational only and does not constitute financial, investment, or economic advice. Inflation assumptions used are illustrative. Actual inflation depends on macroeconomic conditions and policy. CPI data is published by MOSPI. Consult a SEBI-registered investment adviser for personalised financial planning.