$1,000 I Bond with 3.30% Fixed Rate Purchased August 1999

 Jan
1
Feb
1
Infla
tion
Rate
Com
posite
Rate
Mar
1
Apr
1
May
1
Jun
1
Jul
1
Aug
1
Infla
tion
Rate
Com
posite
Rate
Sep
1
Oct
1
Nov
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Dec
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1999 1,000.000.86%5.05%1,004.001,008.401,012.401,016.801999
20001,020.801,025.201.76%6.88%1,030.801,036.801,042.801,048.401,054.401,060.401.91%7.18%1,066.801,072.801,079.201,085.602000
20011,092.001,098.401.52%6.39%1,104.001,110.001,116.001,121.601,127.601,133.601.44%6.23%1,139.601,145.201,151.201,157.202001
20021,162.801,168.801.19%5.72%1,174.401,180.001,185.201,190.801,196.401,202.400.28%3.87%1,206.401,210.001,214.001,218.002002
20031,221.601,225.601.23%5.80%1,231.601,237.201,243.201,249.201,255.201,261.201.77%6.90%1,268.401,275.601,282.801,290.002003
20041,297.201,304.800.54%4.40%1,309.601,314.401,319.201,324.001,328.801,333.601.19%5.72%1,340.001,346.001,352.401,358.802004
20051,365.201,371.601.33%6.00%1,378.401,385.201,392.001,398.801,406.001,412.801.79%6.94%1,420.801,428.801,437.201,445.202005
20061,453.601,462.002.85%9.09%1,472.801,484.001,494.801,506.001,517.201,528.400.50%4.32%1,534.001,539.201,544.801,550.402006
20071,556.001,561.601.55%6.45%1,570.001,578.401,586.401,594.801,603.601,612.001.21%5.76%1,619.601,627.201,635.201,642.802007
20081,650.401,658.401.53%6.41%1,667.201,676.001,684.801,693.601,702.401,711.602.42%8.22%1,723.201,734.801,746.401,758.002008
20091,770.001,782.002.46%8.30%1,794.001,806.401,818.801,830.801,843.601,856.00-2.78%0.00%1,856.001,856.001,856.001,856.002009
20101,856.001,856.001.53%6.41%1,865.601,875.601,885.601,895.601,905.601,915.600.77%4.87%1,923.201,931.201,938.801,946.402010
20111,954.401,962.400.37%4.05%1,968.801,975.601,982.001,988.801,995.602,002.002.30%7.98%2,015.202,028.402,041.602,054.802011
20122,068.402,082.001.53%6.41%2,092.802,104.002,115.202,126.402,137.602,148.801.10%5.54%2,158.802,168.402,178.402,188.402012
20132,198.402,208.400.88%5.09%2,217.602,226.802,236.402,245.602,255.202,264.800.59%4.50%2,273.202,281.602,290.002,298.802013
20142,307.202,315.600.59%4.50%2,324.402,332.802,341.602,350.402,358.802,367.600.92%5.17%2,377.602,388.002,398.002,408.402014
20152,418.402,428.800.74%4.80%2,438.402,448.002,457.602,467.602,477.202,487.20-0.80%1.67%2,490.802,494.002,497.602,501.202015
20162,504.402,508.000.77%4.87%2,518.002,528.002,538.402,548.402,558.802,569.200.08%3.46%2,576.402,584.002,591.202,598.802016
20172,606.002,613.601.38%6.11%2,626.802,640.002,653.202,666.402,680.002,693.600.98%5.29%2,705.202,717.202,728.802,740.802017
20182,752.802,764.801.24%5.82%2,778.002,791.202,804.802,818.002,831.602,845.201.11%5.56%2,858.402,871.202,884.402,897.602018
20192,910.802,924.401.16%5.66%2,938.002,951.602,965.602,979.202,993.203,007.200.70%4.72%3,018.803,030.803,042.403,054.402019
20203,066.403,078.001.01%5.35%3,091.603,105.203,118.803,132.803,146.403,160.400.53%4.38%3,172.003,183.203,194.803,206.402020
20213,218.003,229.600.84%5.01%3,242.803,256.403,270.003,283.203,296.803,310.401.77%6.90%3,329.203,348.003,367.203,386.002021
20223,405.203,424.803.56%10.54%3,454.403,484.003,514.003,544.003,574.403,605.204.81%13.08%3,643.603,682.003,721.203,760.802022
20233,800.803,840.803.24%9.89%3,872.003,903.203,934.803,966.403,998.404,030.801.69%6.74%4,053.204,075.604,098.004,120.802023
20244,143.604,166.801.97%7.31%4,192.004,216.804,242.404,267.604,293.204,319.201.48%6.31%4,341.604,364.004,386.804,409.602024
20254,432.404,455.600.95%5.23%4,474.804,494.004,513.604,532.804,552.404,572.001.43%6.21%4,595.204,618.804,642.404,666.002025
20264,690.004,714.001.56%6.47%4,739.204,764.404,789.604,815.204,840.804,866.40

From $1,000.00 to $4,866.40 over 27.0 years = 5.95% average annual increase compounded semi-annually.

Generated  11/04/25  09:10