$500 I Bond with 1.20% Fixed Rate Purchased March 2008

 Jan
1
Feb
1
Mar
1
Infla
tion
Rate
Com
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Rate
Apr
1
May
1
Jun
1
Jul
1
Aug
1
Sep
1
Infla
tion
Rate
Com
posite
Rate
Oct
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Nov
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Dec
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2008 500.001.53%4.28%501.80503.60505.40507.20509.00510.802.42%6.07%513.40516.00518.402008
2009521.00523.60526.402.46%6.15%529.00531.80534.40537.20539.80542.60-2.78%0.00%542.60542.60542.602009
2010542.60542.60542.601.53%4.28%544.60546.40548.40550.40552.20554.200.77%2.75%555.40556.80558.002010
2011559.20560.60561.800.37%1.94%562.80563.60564.60565.40566.40567.202.30%5.83%570.00572.60575.402011
2012578.20581.00583.801.53%4.28%585.80588.00590.00592.00594.20596.201.10%3.41%597.80599.60601.202012
2013603.00604.60606.400.88%2.97%607.80609.40610.80612.40613.80615.400.59%2.39%616.60617.80619.002013
2014620.20621.60622.800.59%2.39%624.00625.20626.60627.80629.00630.200.92%3.05%631.80633.40635.002014
2015636.60638.20639.800.74%2.69%641.20642.60644.00645.60647.00648.40-0.80%0.00%648.40648.40648.402015
2016648.40648.40648.400.77%2.75%649.80651.40652.80654.40655.80657.400.08%1.36%658.20658.80659.602016
2017660.40661.20661.801.38%3.98%664.00666.20668.40670.60672.80675.000.98%3.17%676.80678.60680.402017
2018682.20684.00685.601.24%3.69%687.60689.80691.80694.00696.20698.201.11%3.43%700.20702.20704.202018
2019706.20708.20710.201.16%3.53%712.20714.40716.40718.60720.60722.800.70%2.61%724.40726.00727.602019
2020729.00730.60732.201.01%3.23%734.20736.20738.00740.00742.00744.000.53%2.27%745.40746.80748.202020
2021749.60751.00752.400.84%2.89%754.20756.00757.80759.60761.40763.201.77%4.76%766.20769.20772.202021
2022775.20778.40781.403.56%8.36%786.80792.20797.60803.00808.60814.004.81%10.88%821.20828.60835.802022
2023843.20850.80858.203.24%7.72%863.60869.20874.60880.20885.80891.401.69%4.60%894.80898.20901.602023
2024905.00908.40912.001.97%5.16%915.80919.80923.60927.60931.60935.601.48%4.18%938.80942.00945.402024
2025948.60951.80955.200.95%3.11%957.60960.20962.60965.00967.60970.001.43%4.08%973.20976.60979.802025
2026983.20986.40989.801.56%4.34%993.40997.001,000.401,004.001,007.601,011.20

From $500.00 to $1,011.20 over 18.5 years = 3.84% average annual increase compounded semi-annually.

Generated  11/04/25  09:10