Real Interest Rate
The nominal interest rate minus expected inflation — the true, inflation-adjusted return on lending or cost of borrowing.
Formula
Real Rate ≈ Nominal Rate − Expected Inflation (exact: (1 + nominal)/(1 + inflation) − 1)
The real interest rate is the nominal (stated) interest rate adjusted for inflation. It answers the question that actually matters to savers and borrowers: after prices rise, how much purchasing power did you really earn or pay? A 5% nominal rate with 3% inflation is only a 2% real rate.
The relationship is captured by the Fisher equation. Real rates can be negative — when inflation outruns nominal yields, lenders lose purchasing power even while collecting interest, which historically fuels rallies in gold and other non-yielding stores of value. Positive, rising real rates do the opposite: they raise the opportunity cost of holding assets that pay no income and tend to pressure equities and precious metals.
The market's cleanest read on the real rate is the yield on Treasury Inflation-Protected Securities (TIPS), often called the real yield. Watch real rates, not nominal ones, to understand the genuine stance of monetary policy: a central bank can hike nominal rates yet still be loose if inflation is climbing faster.
Example
A 1-year Treasury yields 4.5% while expected inflation is 3.0%. Using the approximation, the real interest rate is 4.5% - 3.0% = 1.5%. If inflation expectations then jump to 5.0%, the real rate turns negative at 4.5% - 5.0% = -0.5%, meaning the bondholder loses half a percent of purchasing power despite earning nominal interest.
Related Terms
Federal Funds Rate
The overnight interest rate at which U.S. banks lend reserve balances to each other — the primary policy rate the Fed targets to steer the economy.
IntermediateInflation
The rate at which the general price level of goods and services rises, eroding purchasing power over time.
BeginnerInterest Rate
The cost of borrowing money, set or influenced by central banks — the single most powerful lever in macroeconomics.
Beginner