TIPS Bond Real Return Calculator
Calculate the real inflation-adjusted return on Treasury Inflation-Protected Securities and compare to nominal Treasury bonds.
What Are TIPS?
Treasury Inflation-Protected Securities (TIPS) are U.S. government bonds whose principal adjusts with the Consumer Price Index (CPI). As inflation rises, so does your principal — and therefore your coupon payments. At maturity, you receive the higher of the original or inflation-adjusted principal.
TIPS vs Nominal Bonds
Nominal bonds pay a fixed coupon on a fixed principal. Inflation erodes the real purchasing power of those payments over time. TIPS protect against that erosion.
The Break-Even Inflation Rate Break-even inflation = nominal yield − TIPS real yield. If actual inflation exceeds the break-even rate, TIPS outperform nominal bonds. If inflation stays below break-even, nominal bonds win.
TIPS Mechanics Year n adjusted principal = original principal × (1 + inflation)^n Annual coupon = adjusted principal × TIPS real yield Cumulative TIPS value = adjusted principal + sum of all coupons
Nominal Bond Mechanics Annual coupon = original principal × nominal yield (fixed, does not adjust) Total nominal value = original principal + sum of all coupons Real purchasing power of nominal = total nominal value ÷ (1 + inflation)^years
Key Takeaway TIPS shine when inflation is higher than expected. In low-inflation environments, nominal bonds often win on total return. For retirement planning, a mix of both reduces risk.
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This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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