Break-Even Inflation Rate Calculator
Compare a nominal bond yield with an inflation-protected yield to find the inflation rate the market is pricing in.
How it works
Break-even inflation = (1 + nominal yield) ÷ (1 + real yield) − 1 · Simple = nominal − real
The break-even inflation rate is the inflation the market expects over a bond’s life — the rate at which owning a regular bond and an inflation-protected bond of the same maturity would leave you equally well off. It is read straight off the gap between a nominal Treasury yield and a TIPS yield. If actual inflation comes in above the break-even, the inflation-protected bond wins; below it, the nominal bond wins.
Worked example
A 10-year Treasury yields 4.5% while a 10-year TIPS yields 2.0%. The break-even inflation rate is (1.045 ÷ 1.020) − 1 ≈ 2.45%. The quick spread estimate of 4.5 − 2.0 = 2.5% is close but slightly overstates it.
Frequently asked questions
What does the break-even rate tell me?
It is the market’s collective forecast of average inflation over the bond’s maturity. If you think inflation will be higher, inflation-protected bonds look attractive; if lower, nominal bonds do.
Why does the exact formula differ from the simple spread?
Yields compound, so dividing the growth factors is more precise than subtracting the rates. The difference is small at low rates but grows as yields rise.
Is the break-even rate a guaranteed forecast?
No. It reflects expectations plus an inflation-risk premium, and it moves daily with the market. Realised inflation frequently differs from the break-even rate.
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Educational estimate, not investment advice. Past returns do not predict future results.