Find your real rate of return, after adjusting for inflation.
Uses the Fisher equation, which divides by (1 + inflation) rather than simply subtracting it — more accurate, especially at higher rates.
Real return: (1 + nominal) ÷ (1 + inflation) − 1
Real return is what your investment earns after inflation has taken its share. A 7% FD during a year of 6% inflation leaves you only about 1% better off in terms of what your money can buy. This calculator gives that inflation-adjusted rate from two inputs: the nominal return and the inflation rate.
It uses the Fisher equation, which divides by one plus inflation instead of simply subtracting it. For everyday rates the two methods are close, but the exact version is the correct one and matters more as rates rise.
Savers comparing deposits, retirees judging whether their income is keeping up, and students of economics all use real return to see through headline percentages.
1. Note the nominal return R% and the inflation rate π% for the same period.
2. Convert both to growth factors: 1 + R ÷ 100 and 1 + π ÷ 100.
3. Divide: (1 + R ÷ 100) ÷ (1 + π ÷ 100).
4. Subtract 1 and multiply by 100: real return = ((1 + R ÷ 100) ÷ (1 + π ÷ 100) − 1) × 100.
5. For a quick mental check, R − π gives an approximation that is slightly too high.
6. For an after-tax real return, reduce R for tax first, then apply the formula.
Suppose ₹100 buys 100 units of a basket today. After a year at nominal return R, you have 100(1 + R) rupees. Prices have risen by π, so each unit costs 1 + π. The number of units you can now buy is 100(1 + R) ÷ (1 + π). Your real growth in buying power is therefore (1 + R) ÷ (1 + π) − 1. Expanding this gives (R − π) ÷ (1 + π), which shows why simple subtraction overstates the real return: it ignores the division by 1 + π.
When inflation exceeds the nominal return, the real return is negative. Your balance still rises in rupees, but it buys less. This has happened to savings account deposits and even some FDs during periods of high inflation. After tax, it is more common still. A person in a high bracket earning 7% on an FD keeps less than 5% after tax, which may be below inflation. Real return after tax is the most honest measure of whether a safe investment is preserving wealth.
Real returns let you plan at today's prices. If you expect 11% from equity and 6% inflation, the real rate is about 4.7%. You can then project savings at 4.7% and read the result at present-day prices, without inflating the goal separately. For this to be consistent, the inflation figure should match the goal: education inflation for a college fund, general inflation for household expenses. Always use the same period for both rates, usually one year.
Ramesh has an FD paying 7.25% a year and reads that consumer inflation over the same period was about 5.2%. He wants to know his real gain.
Answer: Real (inflation-adjusted) return 1.95%
Subtracting inflation instead of dividing, especially at high rates.
Comparing a pre-tax return with inflation and calling it a real gain.
Using a nominal return for one period and inflation for a different period.
Assuming a positive real return means the investment is safe from all risk.
Forgetting that your personal inflation may differ from the headline figure.
Checking whether an FD or savings scheme is keeping up with prices.
Choosing a real rate for long-term goal projections.
Comparing returns across countries or time periods with different inflation.
Understanding interest rate policy discussions in economics classes.
Why not just subtract inflation from the nominal return?
Simple subtraction is a rough guess that shows a smaller effect than there really is, especially at higher rates. A more exact method, called the Fisher equation, uses division instead, and gives a more accurate answer.