Bilinear and power law swelling equations were developed for solution-annealed Type 304 stainless steel from Treat Tubing heat 136272. All of the temperatures and fluences were calculated with the same thermal-hydraulic computer code. This procedure insured that all the data were evaluated on a consistent basis. The swelling equations formulated in this investigation were different from other empirical equations because of differences in the swelling data and the form of the swelling equation. The bilinear equation is recommended for the analysis of experimental data and will be used in the analysis of residual stress measurements made on the same lot of tubing.