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Right — been using this thing for about five months now and it's basically bookmarked at this point, so thought I'd chuck my thoughts in since a lad on another thread asked me a few days back. Am UK based, mainly bet football and racing, small stakes, just so you know where I'm coming from.
How I found it was genuinely pretty stupid — I never could work out what an each way payout would be with 1/5 odds a place. I used to just eyeball it and get a shock. Now I type the odds in before I place anything, even a straight one-selection punt.
The single bet calculator is the bit I'm on daily — type in stake and odds and it shows returns with no faffing, either odds format. Same tool covers the fiddly ones — acca and treble maths, a lucky 15, a yankee, and that's where I'd always lose track. If you fancy a poke about, it's here kalkulator odds single bet and it's free with no account nonsense.
The thing that actually made a difference were the geekier extras. The implied probability converter and it makes obvious the overround, and a kelly calculator — I run quarter kelly because full kelly is terrifying. The dutch tool is handy too if I'm spreading across selections.
It's not perfect mind. The layout feels a bit basic — no frills, looks like it was built by someone who cares more about maths than colours. On my phone it works though the acca grid make you pinch and zoom. There's no proper app, it's a website and that's it — slight shame but you asked.
Anyway. Costs nowt, not plastered in adverts, works. If anyone even now does the maths on paper, have a look — saved me plenty of "wait, that's it?" moments.