I Bond Composite Rates

  Semi-annual Inflation Rates
Fixed
↓ Rates ↓
1125525112452411235231122522112152111205201119519111851811175171116516111551511145141113513111251211115111110510110950911085081107507110650611055051104504110350311025021101501110050011995991198998
1.561.430.951.481.971.693.244.813.561.770.840.531.010.701.161.111.240.981.380.080.77-0.800.740.920.590.590.881.101.532.300.370.771.53-2.782.462.421.531.211.550.502.851.791.331.190.541.771.230.281.191.441.521.911.760.860.860.62
09 19983.406.576.315.336.417.416.849.9913.1810.647.005.114.485.454.825.765.665.925.396.213.564.971.774.915.274.604.605.195.646.518.084.154.976.510.008.408.326.515.866.554.429.207.046.115.824.507.005.903.975.826.336.497.286.985.155.154.66
11 19983.306.476.215.236.317.316.749.8913.0810.546.905.014.385.354.725.665.565.825.296.113.464.871.674.805.174.504.505.095.546.417.984.054.876.410.008.308.226.415.766.454.329.096.946.005.724.406.905.803.875.726.236.397.186.885.055.05
05 19993.306.476.215.236.317.316.749.8913.0810.546.905.014.385.354.725.665.565.825.296.113.464.871.674.805.174.504.505.095.546.417.984.054.876.410.008.308.226.415.766.454.329.096.946.005.724.406.905.803.875.726.236.397.186.885.05
11 19993.406.576.315.336.417.416.849.9913.1810.647.005.114.485.454.825.765.665.925.396.213.564.971.774.915.274.604.605.195.646.518.084.154.976.510.008.408.326.515.866.554.429.207.046.115.824.507.005.903.975.826.336.497.286.98
05 20003.606.786.515.536.617.617.0410.2013.3910.857.205.314.685.665.035.965.866.125.606.413.765.171.975.115.474.804.805.395.846.728.284.355.176.720.008.618.536.726.066.764.629.407.246.316.024.707.206.104.176.026.536.697.49
11 20003.406.576.315.336.417.416.849.9913.1810.647.005.114.485.454.825.765.665.925.396.213.564.971.774.915.274.604.605.195.646.518.084.154.976.510.008.408.326.515.866.554.429.207.046.115.824.507.005.903.975.826.336.49
05 20013.006.175.904.936.007.006.439.5812.7610.236.594.714.085.054.425.355.255.524.995.803.164.561.384.504.874.204.204.795.236.117.673.754.566.110.007.997.916.115.466.154.028.796.635.705.424.106.595.503.575.425.92
11 20012.005.154.893.924.995.985.418.5411.729.195.583.703.074.043.414.344.244.503.984.792.163.560.383.493.863.193.193.784.225.096.652.753.565.090.006.976.895.094.445.133.017.765.624.694.403.095.584.482.574.40
05 20022.005.154.893.924.995.985.418.5411.729.195.583.703.074.043.414.344.244.503.984.792.163.560.383.493.863.193.193.784.225.096.652.753.565.090.006.976.895.094.445.133.017.765.624.694.403.095.584.482.57
11 20021.604.744.483.524.585.575.018.1311.308.785.173.292.673.643.013.943.844.103.584.381.763.150.003.093.452.792.793.373.824.686.242.353.154.680.006.566.484.684.044.722.617.355.214.284.002.695.174.08
05 20031.104.243.983.014.085.064.507.6210.778.264.662.792.173.132.513.433.333.593.073.881.262.650.002.592.952.292.292.873.314.185.731.842.654.180.006.055.974.183.534.222.116.834.703.773.492.194.66
11 20031.104.243.983.014.085.064.507.6210.778.264.662.792.173.132.513.433.333.593.073.881.262.650.002.592.952.292.292.873.314.185.731.842.654.180.006.055.974.183.534.222.116.834.703.773.492.19
05 20041.004.143.872.913.974.964.407.5110.678.164.562.692.073.032.413.333.233.492.973.771.162.550.002.492.852.192.192.773.214.085.621.742.554.080.005.945.864.083.434.122.016.734.603.673.39
11 20041.004.143.872.913.974.964.407.5110.678.164.562.692.073.032.413.333.233.492.973.771.162.550.002.492.852.192.192.773.214.085.621.742.554.080.005.945.864.083.434.122.016.734.603.67
05 20051.204.344.083.114.185.164.607.7210.888.364.762.892.273.232.613.533.433.693.173.981.362.750.002.693.052.392.392.973.414.285.831.942.754.280.006.156.074.283.634.322.216.934.80
11 20051.004.143.872.913.974.964.407.5110.678.164.562.692.073.032.413.333.233.492.973.771.162.550.002.492.852.192.192.773.214.085.621.742.554.080.005.945.864.083.434.122.016.73
05 20061.404.544.283.314.385.374.807.9311.098.574.963.092.473.432.813.743.643.903.374.181.562.950.002.893.252.592.593.173.624.486.032.152.954.480.006.356.274.483.844.522.41
11 20061.404.544.283.314.385.374.807.9311.098.574.963.092.473.432.813.743.643.903.374.181.562.950.002.893.252.592.593.173.624.486.032.152.954.480.006.356.274.483.844.52
05 20071.304.444.183.214.285.274.707.8210.988.474.862.992.373.332.713.643.533.803.274.081.462.850.002.793.152.492.493.073.514.385.932.042.854.380.006.256.174.383.74
11 20071.204.344.083.114.185.164.607.7210.888.364.762.892.273.232.613.533.433.693.173.981.362.750.002.693.052.392.392.973.414.285.831.942.754.280.006.156.074.28
05 20080.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.481.841.181.181.762.203.064.600.741.543.060.004.924.84
11 20080.703.833.572.613.674.654.097.2010.357.844.252.391.762.732.103.032.933.192.673.470.862.250.002.192.551.881.882.472.913.775.321.442.253.770.005.64
05 20090.103.222.962.003.064.043.486.589.727.223.641.781.162.121.502.422.322.582.062.860.261.640.001.581.941.281.281.862.303.164.700.841.643.160.00
11 20090.303.423.162.203.264.253.696.799.937.433.851.981.362.321.702.622.522.782.263.060.461.840.001.782.141.481.482.062.503.364.911.041.843.36
05 20100.203.323.062.103.164.143.586.699.837.333.741.881.262.221.602.522.422.682.162.960.361.740.001.682.041.381.381.962.403.264.800.941.74
11 20100.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.481.841.181.181.762.203.064.600.74
05 20110.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.481.841.181.181.762.203.064.60
11 20110.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.481.841.181.181.762.203.06
05 20120.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.481.841.181.181.762.20
11 20120.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.481.841.181.181.76
05 20130.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.481.841.181.18
11 20130.203.323.062.103.164.143.586.699.837.333.741.881.262.221.602.522.422.682.162.960.361.740.001.682.041.38
05 20140.103.222.962.003.064.043.486.589.727.223.641.781.162.121.502.422.322.582.062.860.261.640.001.581.94
11 20140.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.001.48
05 20150.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.760.161.540.00
11 20150.103.222.962.003.064.043.486.589.727.223.641.781.162.121.502.422.322.582.062.860.261.64
05 20160.103.222.962.003.064.043.486.589.727.223.641.781.162.121.502.422.322.582.062.860.26
11 20160.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.962.76
05 20170.003.122.861.902.963.943.386.489.627.123.541.681.062.021.402.322.222.481.96
11 20170.103.222.962.003.064.043.486.589.727.223.641.781.162.121.502.422.322.58
05 20180.303.423.162.203.264.253.696.799.937.433.851.981.362.321.702.622.52
11 20180.503.633.372.403.474.453.897.0010.147.644.052.181.562.531.902.83
05 20190.503.633.372.403.474.453.897.0010.147.644.052.181.562.531.90
11 20190.203.323.062.103.164.143.586.699.837.333.741.881.262.22
05 20200.003.122.861.902.963.943.386.489.627.123.541.681.06
11 20200.003.122.861.902.963.943.386.489.627.123.541.68
05 20210.003.122.861.902.963.943.386.489.627.123.54
11 20210.003.122.861.902.963.943.386.489.627.12
05 20220.003.122.861.902.963.943.386.489.62
11 20220.403.533.272.303.374.353.796.89
05 20230.904.033.772.813.874.864.30
11 20231.304.444.183.214.285.27
05 20241.304.444.183.214.28
11 20241.204.344.083.11
05 20251.104.243.98
11 20250.904.03

Each composite rate computed using fixed rate from the left and inflation rate from the top as follows:
composite rate = fixed rate + ( 2 X inflation rate ) + ( fixed rate X inflation rate )
Example Sep 1998 (top right): 0.0466 = 0.0340 + ( 2 X 0.0062 ) + ( 0.0340 X 0.0062 )

Generated  11/04/25  09:10