I Bond Estimator Calculator
Rough value of a Series I savings bond.
Your numbers
Estimated value
$12,305
Composite rate
4.24%
The link and the printed sheet both save your numbers, so anyone who opens them sees the same estimate.
Compare scenarios
Save your current numbers, change them, save again, and see each estimate side by side. Saved in this browser only.
How it works
Estimate using a steady composite rate. Cashing before 5 years loses 3 months' interest.
More savings & interest calculators
Savings Calculator
How fast a savings account grows.
Savings Goal Calculator
Monthly amount needed to hit a target.
Simple Interest Calculator
Interest without compounding.
CD Calculator
Certificate of deposit value at maturity.
APY Calculator
Convert APR to APY.
Emergency Fund Calculator
How big your safety net should be.
Results are estimates for education only and are not investment advice.