Inflation Calculator
Calculate how inflation affects your money over time. Forward and backward flat-rate modes plus historical CPI data for India and the U.S.
Future cost (inflation-adjusted)
₹1,79,085
Purchasing power loss
₹79,085
Real rate of return
1.89%
Years to halve purchasing power
11.9 years
What this means
If something costs ₹1,00,000 today, it will cost approximately ₹1,79,085 in 10 years at 6% inflation. Your purchasing power decreases by ₹79,085 over this period. To beat inflation, your investments need to earn at least 6% annually — your nominal return of 8% gives you a real (inflation-adjusted) return of 1.89%.
Last updated: March 2026
How this calculator is verified
Checked by True Calculator automated test suite on
- Formula verified against a published worked example in the automated test suite
- Edge cases (zero, negative, boundary and unit-mismatch inputs) covered by unit tests
The full verification method is on our how we verify page. Found an error? Tell us and we will re-check it.
When to Use This Calculator
Use the inflation calculator when you want to know what today's rupee will be worth in the future, or what a future cost means in today's money. Rising prices are a daily reality for Indian households, and the same math works for any planning question: what a ₹1 lakh expense today will cost when a child starts college, how much the value of a fixed deposit erodes over its tenure, and what a retirement corpus will actually buy in 20 years. Enter an amount, an inflation rate — the long-run Indian average is a sensible starting point — and the number of years, and read the future cost and the purchasing power loss side by side. Pensioners, parents saving for education and anyone comparing nominal returns against inflation uses it to keep planning honest.
How to Use This Calculator
- Step 1: Pick a country — India or the U.S. — to set the currency and historical CPI dataset.
- Step 2: Enter the amount of money you are thinking about in the amount field.
- Step 3: Choose a mode: forward flat rate, backward flat rate, or historical CPI. For flat-rate modes, enter the inflation rate and years; for historical mode, pick the from and to years.
- Step 4: Read the results — future cost, purchasing power loss, real rate of return and years to halve — and compare them across modes.
Worked Example
In forward mode with India selected, ₹1,00,000 today at an assumed 6% inflation for 10 years will need about ₹1,79,085 to buy the same goods — a purchasing power loss of about ₹79,085. At 6% inflation, purchasing power halves in about 11.9 years. If that money earns a nominal 8%, the real rate of return is about 1.89%. In backward mode, ₹1,00,000 in 10 years at 6% inflation is worth about ₹55,839 today. In historical mode, the tool uses real CPI data: ₹100 in 2015 equals about ₹151 in 2024 under the official India CPI (Combined) index, while $100 in 1980 equals about $380.70 in 2024 under the U.S. CPI-U index.
Tips and Common Mistakes
- •Tip 1: Plan with a long-run inflation assumption in the 4-6% range for India or 2-4% for the U.S., rather than a single year's spike.
- •Tip 2: Stock and bond returns are quoted in nominal terms — subtract your assumed inflation to get the real return.
- •Tip 3: For retirement goals, use the future-cost figure to see what today's ₹1,00,000 will need to buy in 20 or 30 years.
- ✗Mistake 1: Using the current year's headline spike as the planning rate — short-term inflation is not the long-run trend.
- ✗Mistake 2: Swapping the nominal return and inflation inputs — the real-rate output depends on both being in the right fields.
How Purchasing Power Erodes at 6% Inflation
| Item | Value |
|---|---|
| Today | ₹10,00,000 (100%) |
| In 5 years | ₹7,47,258 (74.7%) |
| In 10 years | ₹5,58,395 (55.8%) |
| In 15 years | ₹4,17,265 (41.7%) |
| In 20 years | ₹3,11,805 (31.2%) |
Expert Note
India's long-run CPI inflation averages 5.5-6.5%, but specific categories vary: education runs 8-10%, healthcare 6-8%, and food 4-7%. When planning for a specific goal, use the inflation rate for that category, not the general average. A 6% inflation rate halves purchasing power in about 11.9 years.
How to Interpret the Results
The future-cost figure tells you how much cash you will need; the purchasing-power figure tells you what that cash is actually worth in today's terms. If your investment return is above the inflation rate, your real wealth grows. If it is below, you are losing purchasing power even though the nominal number looks larger. For Indian retirees, a portfolio returning 7% with 6% inflation gives a real return of only about 1% — this is why many financial advisors recommend a mix of equity and debt to beat inflation over the long term.
Sources and References
- •Reserve Bank of India: Consumer Price Index data — rbi.org.in
- •Ministry of Statistics and Programme Implementation: CPI inflation data
- •U.S. Bureau of Labor Statistics: CPI-U Historical Series
Official sources are linked so you can confirm the current rate yourself. Check the linked page for the latest notification before relying on these figures.
Frequently Asked Questions
What is inflation?
Inflation is the rate at which prices rise over time, reducing purchasing power. If inflation is 6%, something costing ₹100 today will cost ₹106 next year.
What is the current inflation rate in India?
India's CPI inflation typically ranges 4-7%. The RBI targets 4% with a ±2% tolerance. Check the Ministry of Statistics for the latest figures.
How does inflation affect my savings?
If savings earn less than inflation, you lose purchasing power. Money in a savings account at 4% loses value when inflation is 6%.
What is real rate of return?
Real return = (1 + nominal return) / (1 + inflation) - 1. At 10% nominal and 6% inflation, real return is about 3.8%.
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