$500 I Bond with 3.30% Fixed Rate Purchased January 1999

 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
1999500.000.86%5.05%502.00504.20506.20508.40510.40512.600.86%5.05%514.80516.80519.00521.20523.401999
2000525.601.76%6.88%528.60531.60534.60537.60540.60543.601.91%7.18%546.80550.00553.20556.60559.802000
2001563.201.52%6.39%566.20569.20572.20575.20578.20581.201.44%6.23%584.20587.20590.20593.20596.202001
2002599.401.19%5.72%602.20605.00608.00610.80613.60616.600.28%3.87%618.60620.60622.60624.60626.602002
2003628.601.23%5.80%631.60634.60637.60640.60643.80646.801.77%6.90%650.40654.20657.80661.60665.402003
2004669.200.54%4.40%671.60674.00676.60679.00681.40684.001.19%5.72%687.20690.40693.80697.00700.202004
2005703.601.33%6.00%707.00710.60714.00717.60721.20724.801.79%6.94%729.00733.00737.20741.40745.602005
2006750.002.85%9.09%755.60761.20766.80772.60778.40784.000.50%4.32%786.80789.60792.40795.20798.002006
2007801.001.55%6.45%805.20809.60813.80818.20822.40826.801.21%5.76%830.80834.60838.60842.60846.602007
2008850.601.53%6.41%855.00859.60864.20868.60873.20877.802.42%8.22%883.80889.60895.60901.60907.802008
2009913.802.46%8.30%920.00926.20932.60939.00945.20951.80-2.78%0.00%951.80951.80951.80951.80951.802009
2010951.801.53%6.41%956.80961.80967.00972.00977.20982.400.77%4.87%986.40990.40994.20998.201,002.202010
20111,006.400.37%4.05%1,009.801,013.201,016.601,020.001,023.401,026.802.30%7.98%1,033.601,040.201,047.001,054.001,060.802011
20121,067.801.53%6.41%1,073.401,079.001,084.801,090.401,096.201,102.001.10%5.54%1,107.001,112.001,117.201,122.201,127.402012
20131,132.600.88%5.09%1,137.401,142.201,147.001,151.801,156.601,161.400.59%4.50%1,165.801,170.001,174.401,178.801,183.202013
20141,187.600.59%4.50%1,192.001,196.401,200.801,205.401,209.801,214.400.92%5.17%1,219.601,224.801,230.001,235.201,240.602014
20151,245.800.74%4.80%1,250.801,255.601,260.601,265.601,270.601,275.60-0.80%1.67%1,277.401,279.201,281.001,282.601,284.402015
20161,286.200.77%4.87%1,291.401,296.601,301.801,307.001,312.201,317.600.08%3.46%1,321.401,325.201,329.001,332.801,336.602016
20171,340.401.38%6.11%1,347.201,354.001,360.801,367.601,374.401,381.400.98%5.29%1,387.401,393.401,399.601,405.601,411.802017
20181,418.001.24%5.82%1,424.801,431.601,438.401,445.401,452.401,459.201.11%5.56%1,465.801,472.601,479.401,486.201,493.002018
20191,499.801.16%5.66%1,506.801,513.801,520.801,528.001,535.001,542.200.70%4.72%1,548.201,554.201,560.201,566.401,572.402019
20201,578.601.01%5.35%1,585.601,592.601,599.601,606.601,613.801,620.800.53%4.38%1,626.601,632.601,638.401,644.401,650.402020
20211,656.200.84%5.01%1,663.001,670.001,676.801,683.801,690.801,697.601.77%6.90%1,707.201,717.001,726.601,736.401,746.202021
20221,756.203.56%10.54%1,771.201,786.601,801.801,817.401,833.001,848.804.81%13.08%1,868.401,888.201,908.201,928.601,949.002022
20231,969.803.24%9.89%1,985.802,001.802,018.002,034.202,050.602,067.201.69%6.74%2,078.602,090.202,101.802,113.402,125.002023
20242,136.801.97%7.31%2,149.602,162.602,175.402,188.602,201.602,215.001.48%6.31%2,226.402,238.002,249.602,261.402,273.002024
20252,284.800.95%5.23%2,294.602,304.602,314.402,324.402,334.402,344.601.43%6.21%2,356.602,368.602,380.802,392.802,405.202025
20262,417.401.56%6.47%2,430.202,443.202,456.202,469.202,482.402,495.60

From $500.00 to $2,495.60 over 27.5 years = 5.93% average annual increase compounded semi-annually.

Generated  11/04/25  09:10