// multi-utility computation suite · offline · instant · precise
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fin.series-i-bond-return Calculator
Calculates the future value of Series I Bonds from the composite rate (fixed + inflation component) over any holding period. I Bonds earn at least the rate of inflation — they provide guaranteed real return but have purchase limits ($10,000/year per SSN).
Inputs
Principal
Reference formula or conversion factor shown for context.
Fixed Rate Pct
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Cpi Rate Pct
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Years Held
Reference formula or conversion factor shown for context.
Results
future value
What your investment will be worth at the end of the period. The power of compounding: $10,000 at 8% for 30 years grows to about $100,000.
composite rate
The value at the specified point or condition.
total return
The combined total across all inputs and components.
early redemption penalty
Sample size or count used in the calculation.
annual purchase limit
The result expressed on a per-year basis.
composite = fixed + 2×CPI + 2×CPI×fixed
Reference formula or conversion factor shown for context.