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Right — been on this thing for about a few months now and I keep coming back, so thought I'd write something up since a mate asked me a few days back. Am based in the UK, mainly do football and horses, nothing mad, for context.
How I found it was honestly embarrassing — I could never figure out what an e/w return would be when the place terms changed. I used to just guess and moan when the payout landed. Now punch the numbers in before I place anything, even a straight one-selection punt.
The single bet calculator tool is the one I open most — type in the price and your stake and it shows returns instantly, either odds format. It also handles the fiddly ones — acca and treble maths, lucky 15 and lucky 63, patents and yankees, and that's where I'd always lose track. If you fancy a poke about, it's over at novig calculator and it's free with no account nonsense.
The thing that really made a difference were the nerdier bits. The implied probability converter which shows you how much the bookie's taking, and a kelly criterion calculator — I stick to fractional kelly since full stakes are a quick route to a dead bankroll. Dutching calculator gets used a fair bit for when I'm covering two or three runners.
It's not perfect mind. Its layout feels a bit basic — zero polish, it's clearly function over form. On mobile it's usable although the acca grid make you pinch and zoom. And nothing on the app store, it's browser only — doesn't bother me but worth saying.
So yeah. Costs nowt, barely any ads, does what it says. If anyone even now does the maths on paper, try it — it's saved me a fair few dumb bets I'd have regretted.