An online version of the hashpass algorithm as used in the Hashpass extension. Entirely local in the browser and very basic. Handy if you haven't got the plugin available. Read more
Updated 7 June 2026 to reflect updated odds and rate for July 2026 (3.80%) I've got some premium bonds, and wanted a better idea of the distribution of returns than the MSE Calculator provides. I try to keep the odds and rate up to date when they change, but do check that it is updated above. It's based on the odds and rate given here and the estimated prize distribution here. See below for the details of the calculation. Read more