$1,000 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
19991,000.000.86%5.05%1,004.001,008.401,012.401,016.801,020.801,025.200.86%5.05%1,029.601,033.601,038.001,042.401,046.801999
20001,051.201.76%6.88%1,057.201,063.201,069.201,075.201,081.201,087.201.91%7.18%1,093.601,100.001,106.401,113.201,119.602000
20011,126.401.52%6.39%1,132.401,138.401,144.401,150.401,156.401,162.401.44%6.23%1,168.401,174.401,180.401,186.401,192.402001
20021,198.801.19%5.72%1,204.401,210.001,216.001,221.601,227.201,233.200.28%3.87%1,237.201,241.201,245.201,249.201,253.202002
20031,257.201.23%5.80%1,263.201,269.201,275.201,281.201,287.601,293.601.77%6.90%1,300.801,308.401,315.601,323.201,330.802003
20041,338.400.54%4.40%1,343.201,348.001,353.201,358.001,362.801,368.001.19%5.72%1,374.401,380.801,387.601,394.001,400.402004
20051,407.201.33%6.00%1,414.001,421.201,428.001,435.201,442.401,449.601.79%6.94%1,458.001,466.001,474.401,482.801,491.202005
20061,500.002.85%9.09%1,511.201,522.401,533.601,545.201,556.801,568.000.50%4.32%1,573.601,579.201,584.801,590.401,596.002006
20071,602.001.55%6.45%1,610.401,619.201,627.601,636.401,644.801,653.601.21%5.76%1,661.601,669.201,677.201,685.201,693.202007
20081,701.201.53%6.41%1,710.001,719.201,728.401,737.201,746.401,755.602.42%8.22%1,767.601,779.201,791.201,803.201,815.602008
20091,827.602.46%8.30%1,840.001,852.401,865.201,878.001,890.401,903.60-2.78%0.00%1,903.601,903.601,903.601,903.601,903.602009
20101,903.601.53%6.41%1,913.601,923.601,934.001,944.001,954.401,964.800.77%4.87%1,972.801,980.801,988.401,996.402,004.402010
20112,012.800.37%4.05%2,019.602,026.402,033.202,040.002,046.802,053.602.30%7.98%2,067.202,080.402,094.002,108.002,121.602011
20122,135.601.53%6.41%2,146.802,158.002,169.602,180.802,192.402,204.001.10%5.54%2,214.002,224.002,234.402,244.402,254.802012
20132,265.200.88%5.09%2,274.802,284.402,294.002,303.602,313.202,322.800.59%4.50%2,331.602,340.002,348.802,357.602,366.402013
20142,375.200.59%4.50%2,384.002,392.802,401.602,410.802,419.602,428.800.92%5.17%2,439.202,449.602,460.002,470.402,481.202014
20152,491.600.74%4.80%2,501.602,511.202,521.202,531.202,541.202,551.20-0.80%1.67%2,554.802,558.402,562.002,565.202,568.802015
20162,572.400.77%4.87%2,582.802,593.202,603.602,614.002,624.402,635.200.08%3.46%2,642.802,650.402,658.002,665.602,673.202016
20172,680.801.38%6.11%2,694.402,708.002,721.602,735.202,748.802,762.800.98%5.29%2,774.802,786.802,799.202,811.202,823.602017
20182,836.001.24%5.82%2,849.602,863.202,876.802,890.802,904.802,918.401.11%5.56%2,931.602,945.202,958.802,972.402,986.002018
20192,999.601.16%5.66%3,013.603,027.603,041.603,056.003,070.003,084.400.70%4.72%3,096.403,108.403,120.403,132.803,144.802019
20203,157.201.01%5.35%3,171.203,185.203,199.203,213.203,227.603,241.600.53%4.38%3,253.203,265.203,276.803,288.803,300.802020
20213,312.400.84%5.01%3,326.003,340.003,353.603,367.603,381.603,395.201.77%6.90%3,414.403,434.003,453.203,472.803,492.402021
20223,512.403.56%10.54%3,542.403,573.203,603.603,634.803,666.003,697.604.81%13.08%3,736.803,776.403,816.403,857.203,898.002022
20233,939.603.24%9.89%3,971.604,003.604,036.004,068.404,101.204,134.401.69%6.74%4,157.204,180.404,203.604,226.804,250.002023
20244,273.601.97%7.31%4,299.204,325.204,350.804,377.204,403.204,430.001.48%6.31%4,452.804,476.004,499.204,522.804,546.002024
20254,569.600.95%5.23%4,589.204,609.204,628.804,648.804,668.804,689.201.43%6.21%4,713.204,737.204,761.604,785.604,810.402025
20264,834.801.56%6.47%4,860.404,886.404,912.404,938.404,964.804,991.20

From $1,000.00 to $4,991.20 over 27.5 years = 5.93% average annual increase compounded semi-annually.

Generated  11/04/25  09:10