I've always used my own excel calculator based on the HST-principles (75%, 80%, 85%, 90%, 95%, 100% of xx RM), 48 hours between trainings, etc. It's quite simple to make one for yourself, but I have uploaded my own if you want to use it.
Of course, you will need to have Microsoft Excel/Open Office to be able to open and use the calculator. However, this calculator allows decimals and automatically calculates the weight for each day based on 5% weight increase from day to day. If you're going to print it, you have to print it vertically to make it fit. See attachment for download.
(I hope it's okay with the HST-admins that I am distributing a HST-calculator that has the HST logo in it).