About TBillLab

TBillLab is a set of free calculators for U.S. Treasury bills — Bank Discount Yield, Bond Equivalent Yield, purchase price and T-bill vs CD comparisons. Every tool runs entirely in your browser, so the numbers you type never leave your device.

The math (discount and equivalent-yield formulas) is standard, published arithmetic that does not change, so the site stays correct without updates.

TBillLab is maintained by an independent maker. It may show non-intrusive advertising once traffic justifies it. We do not collect or sell your data.