Found this calculator and it works quite well I believe:

• https://www.fncalculator.com/financialcalculator?type=usTreasuryBillCalculator

You can look at the past T-bill auctions here (click on Auction Results tab to get investment rate):

• https://www.treasurydirect.gov/auctions/upcoming/

Figured I'd share if anyone is curious about buying them

This post was edited by ChocolateCoveredGummyBears on Mar 9 2024 10:43pm