So — been on this thing for maybe six months now and it's basically bookmarked at this point, so thought I'd say something since someone asked me the other day. I'm in the UK, mostly do football and horses, nothing mad, for context. What got me on it was genuinely a bit daft — I could never get my head round what an each way payout actually was when the place terms changed. I used to just guess and then be surprised. Now I stick my stake in first, every time, even the boring singles. Their single bet calculator is the one I use most — you put in the price and your stake and it spits out profit and total return straight away, fractions or decimals. It also handles the fiddly ones — acca and treble returns, a lucky 15, a yankee, honestly that's where I always lose track. If you want a look, it lives at <a href=https://singlebettingcalculator.uk/bet-calculator/lucky-15>lucky 15 bet</a> and there's no login wall, which I appreciated. One thing that genuinely shifted things for me were the nerdier bits. They've got an implied probability thing and it makes obvious the overround, and a kelly staking calculator — I stick to fractional kelly since full stakes are far too aggressive. Dutching calculator is decent when I'm splitting a race. Not all sunshine though. Its interface looks very functional, let's say — zero flash, 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. And nothing on the app store, it's a website and that's it — fine by me but you asked. Right, that's me. Free, barely any ads, does what it says. If you honestly works out returns on a calculator app, give it a go — it's saved me a load of dumb bets I'd have regretted.