I Bond Rate Calculator
The composite rate behind your I-bond’s growth.
Your I-bond numbers never leave your browser — all math runs locally.Try: Purchase year=2023, Purchase amount=1000, Valuation year=2026, Valuation month=8 → 6.88%, 43, $1,274, $274, $22, $1,252
How to use
The composite rate equals the fixed rate plus twice the semiannual inflation rate. The calculator shows it and the resulting value.
FAQ
Where do rates come from?
Treasury sets them every six months from the fixed rate and CPI inflation.
Related calculators
I Bond Interest CalculatorI Bond Redemption CalculatorI Bond Value CalculatorI Bond Penalty CalculatorI Bond Calculator 2023I Bond Calculator 2024I Bond Calculator 2025I Bond vs CD CalculatorI Bond vs TIPS CalculatorI Bond Ladder CalculatorI Bond Maturity CalculatorI Bond Early Redemption CalculatorI Bond Gift CalculatorI Bond Tax Calculator