Inflation Calculator
Enter an amount, an expected inflation rate and a time period to see what that expense will cost in the future — and what today's money will actually be worth by then.
Why inflation matters more than you think
Inflation is the silent tax on your savings. At India's typical 6% inflation, prices double roughly every 12 years — meaning the ₹50,000/month lifestyle of today will cost about ₹1,00,000/month by then. Any money earning less than inflation is quietly losing value, even while the number in your bank balance keeps rising. Understanding this one idea changes how you save, invest and plan for every long-term goal.
The formula behind this calculator
Future cost compounds exactly the way interest does — but it works against you rather than for you:
Future Cost = Today's Cost × (1 + inflation)^years
The flip side is purchasing power: Real Value = Amount ÷ (1 + inflation)^years. ₹1,00,000 kept as idle cash for 10 years at 6% inflation buys only what ₹55,839 buys today — a 44% loss of purchasing power without a single rupee leaving your account. If you want to see the same compounding curve working in your favour on an investment, the compound interest calculator uses identical maths in the opposite direction.
How fast do prices double? The Rule of 72
A quick mental shortcut: divide 72 by the inflation rate to estimate the number of years for prices to double (and for the real value of idle cash to halve).
| Inflation rate | Prices double in | Real value of cash halves in |
|---|---|---|
| 4% | ~18 years | ~18 years |
| 5% | ~14.4 years | ~14.4 years |
| 6% | ~12 years | ~12 years |
| 8% | ~9 years | ~9 years |
| 10% | ~7.2 years | ~7.2 years |
At the 6% rate most Indian planners use, money parked in a low-interest account loses roughly half its real worth in about a decade — even though the account balance itself never falls.
Not all inflation is equal
The headline CPI figure the RBI targets (a 4% mid-point within a 2–6% tolerance band) reflects an average shopping basket. Your personal inflation depends on what you actually spend on — and the fastest-rising categories are often the ones that matter most for big goals like a child's education or medical care in old age.
| Spending category | Typical inflation |
|---|---|
| Headline CPI (general) | ~5–6% |
| Food & groceries | ~5–7% |
| Education (school & college fees) | ~8–10% |
| Healthcare & medical | ~10–14% |
| Lifestyle & discretionary | ~4–6% |
These are broad, approximate ranges rather than official figures, but the takeaway is firm: plan an education corpus or a retirement healthcare buffer at 8–10% or higher, not at the general 6%. A ₹20 lakh engineering degree today could realistically cost ₹45 lakh or more in ten years at education inflation.
Real returns: the number that actually matters
A return only builds wealth if it beats inflation. Your real return is approximately your investment's return minus inflation (technically (1 + return) ÷ (1 + inflation) − 1, but simple subtraction is close enough for planning). At 6% inflation, here is how common Indian options stack up:
| Where your money sits | Typical return | Real return (approx) |
|---|---|---|
| Savings account | ~2.5–4% | negative (~−2 to −3%) |
| Fixed deposit | ~6.5–7.5% | ~0.5–1.5% |
| PPF | 7.1% | ~1% |
| EPF | 8.25% | ~2% |
| Equity mutual fund (long run) | ~10–12% | ~4–6% |
An FD feels safe, but a barely-positive real return means it preserves rather than grows wealth — and any interest is taxed at your slab, which can push the after-tax real return below zero. Use the CAGR calculator to work out the true annualised return on any investment, then subtract your assumed inflation to see what you are really earning.
A worked example: inflation and retirement
Suppose you spend ₹50,000 a month today and plan to retire in 25 years. At 6% inflation:
- Monthly expense at retirement: ₹50,000 × (1.06)^25 = ₹2,14,594 — over four times today's figure.
- That is roughly ₹25.7 lakh in the first year of retirement, and it keeps climbing through a 25–30 year retirement.
- A common rule of thumb is a corpus of 25–30× your first-year retirement expenses, which points to somewhere around ₹6.5–7.5 crore in this example.
Notice how a small change in the assumption compounds enormously: at 7% inflation instead of 6%, the same ₹50,000 balloons to about ₹2.71 lakh a month over 25 years rather than ₹2.15 lakh. That single percentage point adds crores to the corpus you need — which is exactly why it pays to run your own numbers on this calculator before committing to a savings plan, rather than trusting a rough guess.
How to protect your savings from inflation
- Own growth assets for the long run. Over 10-year-plus horizons, diversified equity and index funds have most reliably out-run inflation. A monthly SIP is the simplest entry point for salaried investors.
- Use tax-friendly compounders. PPF at 7.1% and EPF at 8.25% roughly match or modestly beat inflation with sovereign safety, making them a solid debt anchor in your portfolio.
- Don't over-hold cash. Keep 6–12 months of expenses as an emergency fund in liquid form, but recognise that idle cash beyond that is a guaranteed slow loss of purchasing power.
- Plan withdrawals for inflation too. In retirement, a gradually rising withdrawal (not a flat amount) is what keeps your income real year after year — a SWP calculator helps you model this.
Inflation is not a reason to panic — it is a reason to invest. The goal is simply to earn a return, after tax, that stays comfortably ahead of the rate at which prices rise, so your money grows in real terms rather than just in rupees.