Right — been on this thing for maybe five months now and I keep coming back, so thought I'd write something up since a mate asked me a few days back. Am UK based, mainly bet football and racing, a fiver here and there, for context. What got me on it was genuinely pretty stupid — I couldn't ever figure out what an each way payout would be with 1/5 odds a place. I'd just eyeball it and then be surprised. These days I type the odds in before I place anything, even a straight one-selection punt. The single bet calculator is the part I'm on daily — type in the price and your stake and it shows profit and total return straight away, either odds format. Same tool covers the fiddly ones — acca and treble maths, lucky 15 and lucky 63, yankees, which is where I'd always lose track. If you want a look, it's over at pinnacle margin calculator — free, no signup. The thing that genuinely shifted things for me was the more serious tools. They've got an odds-to-probability thing which shows you how much the bookie's taking, and a kelly criterion calculator — I run quarter kelly as the full version is a quick route to a dead bankroll. Dutching calculator is handy too if I'm covering two or three runners. Not all sunshine though. The interface feels very functional, let's say — no polish, which honestly I don't mind but some will. Phone-wise it works but the lucky 63 breakdown need a bit of scrolling. There's no proper app, just the site — fine by me but you asked. Anyway. Costs nowt, no ads shoved in your face, does what it says. If you honestly does the maths on paper, have a look — it's saved me plenty of arguments with the bookie.