So — been on this thing for about four months now and it's basically bookmarked at this point, so figured I'd write something up since a lad on another thread asked me a few days back. I'm UK based, mainly bet football and racing, nothing mad, for context. The reason I started using it was actually embarrassing — I never could get my head round what an ew payout would be once you get five places instead of three. Basically I'd guess and then be surprised. Now stick my stake in before every slip, even the boring singles. The single bet calculator is the bit I use most — you drop in the price and your stake and it spits out profit and total return instantly, fractional or decimal, doesn't matter. Same tool covers the fiddly ones — doubles and trebles returns, lucky 15 and lucky 63, patents and yankees, honestly that's where I always mess it up. If you fancy a poke about, it's here matched bet calculator — free, no signup. The thing that really shifted things for me was the geekier extras. The probability thing that shows how much the bookie's taking, and a kelly criterion tool — I stick to fractional kelly as the full version is a quick route to a dead bankroll. The dutching one gets used a fair bit for when I'm splitting a race. It's not perfect mind. Its design looks a bit basic — zero polish, looks like it was built by someone who cares more about maths than colours. On mobile it works but the acca grid are a squeeze. Also there's no app, just the site — slight shame but worth saying. Anyway. Doesn't cost anything, not plastered in adverts, works. Anyone who even now does the maths on paper, have a look — saves me a load of "wait, that's it?" moments.