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

 Jan
1
Infla
tion
Rate
Com
posite
Rate
Feb
1
Mar
1
Apr
1
May
1
Jun
1
Jul
1
Infla
tion
Rate
Com
posite
Rate
Aug
1
Sep
1
Oct
1
Nov
1
Dec
1
2008500.001.53%4.28%501.80503.60505.40507.20509.00510.802.42%6.07%513.40516.00518.40521.00523.602008
2009526.402.46%6.15%529.00531.80534.40537.20539.80542.60-2.78%0.00%542.60542.60542.60542.60542.602009
2010542.601.53%4.28%544.60546.40548.40550.40552.20554.200.77%2.75%555.40556.80558.00559.20560.602010
2011561.800.37%1.94%562.80563.60564.60565.40566.40567.202.30%5.83%570.00572.60575.40578.20581.002011
2012583.801.53%4.28%585.80588.00590.00592.00594.20596.201.10%3.41%597.80599.60601.20603.00604.602012
2013606.400.88%2.97%607.80609.40610.80612.40613.80615.400.59%2.39%616.60617.80619.00620.20621.602013
2014622.800.59%2.39%624.00625.20626.60627.80629.00630.200.92%3.05%631.80633.40635.00636.60638.202014
2015639.800.74%2.69%641.20642.60644.00645.60647.00648.40-0.80%0.00%648.40648.40648.40648.40648.402015
2016648.400.77%2.75%649.80651.40652.80654.40655.80657.400.08%1.36%658.20658.80659.60660.40661.202016
2017661.801.38%3.98%664.00666.20668.40670.60672.80675.000.98%3.17%676.80678.60680.40682.20684.002017
2018685.601.24%3.69%687.60689.80691.80694.00696.20698.201.11%3.43%700.20702.20704.20706.20708.202018
2019710.20

From $500.00 to $710.20 over 11.0 years = 3.22% average annual increase compounded semi-annually.

Generated  05/01/18  10:10