arb calculator

[presto]

i have this bet, and want to arb off for a profit on the pne vs millwall game,

1 x Five-folds
(Sat) Middlesbrough v West Brom Match Odds - Middlesbrough 4-0
(Sat) Brighton v West Ham Match Odds - Draw 2-2
(Sat) Crewe v Stoke Match Odds - Stoke 0-2
(Sat) Nottm Forest v Burnley Match Odds - Nottm Forest 1-0
(Sun) Millwall v Preston (Sky) Match Odds - Draw

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i have googled but can only find a basic arb calculator. i am sure there is one out there that can do this - but just cant find it.
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the way i see it is this:

if preston draw, then:
win £1,548.82
- 5% commish (£77.44)
= £1471.38

if no draw:
£bugger all

i can lay the draw @ 3.45

so lay £325 @ 3.45 = £1121 liability

draw = £325 - 3% commish = £315.25
no draw = £1471 - £1121 = £350

ok near enough, but took a while to work out - are my sums correct?

[Workshy]

Looks good to me mate & well done :)

[presto]

thanks WS, not bad for a £10 free bet.

all the footy lays came in as well, so quite a good day on the footy. i have never had a big accie come in either, it could have been better though as i also had sunderland @ 1.6 wolves @ 1.5 and chelsea @ 1.4 (all won) but betdaq only allow 5 selections.

[presto]

even better - it's £424 not £325 to lay :D (forgot decimal includes stake) - just a shame some bugger layed 300+ of the £500+ that was available to lay @ 3.45 not so long ago. i will have to wait till tommorow to get on :(