Comprehensive Guide
Learn more in our Investing Guide.
How it works
real return calculator takes your inputs and produces real return, inflation drag. Strip inflation out of your investment return to see the true real return and the drag inflation is costing you. You provide 2 inputs: Nominal return (percent, in percent) (default: 8 percent); Inflation rate (percent, in percent) (default: 3 percent). The calculator returns 2 outputs: Real return (the primary result); Inflation drag (a secondary output). Investment calculations rest on a few variables — principal, return rate, time, and compounding — but their interaction is non-linear enough that intuition alone gets the answer wrong more often than not. This tool runs the real formula with your inputs and shows the numbers that matter, not the rounded approximations from a textbook. The underlying formula: Real return = (1 + nominal/100) / (1 + inflation/100) - 1 With the default values, real return is computed from the interaction of every input field — change any one of them and the result updates immediately, so you can stress-test different scenarios without re-entering the whole form. Adjust the inputs to match your real financial situation. The defaults are realistic starting points, but every person's circumstances differ — your actual income, expenses, rates, and timelines will produce a different answer. Use the tool iteratively: start with the defaults, then change one variable at a time to see which factor has the largest impact on your outcome.Formula
Real return = (1 + nominal/100) / (1 + inflation/100) - 1
Tips
- Plan retirement and goal projections with real returns — nominal numbers quietly overpromise.
- A 1% real return is roughly treading water after taxes; don't mistake it for growth.
- Fixed-rate debt inflates away — a 3% mortgage with 3% inflation has a zero real cost.
- Taxes also bite: compare after-tax, after-inflation returns across asset classes.
Frequently asked questions
What is the difference between nominal and real return?
The nominal return is the raw percentage an investment earns. The real return subtracts inflation's effect, measuring the gain in actual purchasing power. At 8% nominal with 3% inflation, real return is about 4.9% — the difference is what your money can actually buy at the end.
Why is the real return lower than nominal minus inflation?
The exact Fisher relationship compounds both rates: (1 + nominal) = (1 + real) x (1 + inflation). At high inflation the gap between simple subtraction and the formula widens, which is why the calculator uses the exact form.
What is a good real return?
Historically, global equities delivered roughly 4-6% real over long horizons, bonds 1-2%. If an investment is promising above ~8% real, it is either exceptionally risky or misdescribed. Real return is the honest yardstick for every long-term plan.
How do taxes interact with real returns?
Taxes are usually charged on nominal gains, not real ones — so during inflation, you can be taxed on gains that barely beat inflation. The after-tax, after-inflation number is the only one that describes what you truly keep.