Compare is optional: a price you can actually get (for example the Betfair back price), checked against each method's fair odds.
Book total
104.76%
Overround
4.76%
Power k
1.0554
Shin z
0.0241
Home @ 1.50raw 66.67%
Proportional
63.64%
1.571
Power
65.19%
1.534
Shin
64.71%
1.545
Draw @ 4.20raw 23.81%
Proportional
22.73%
4.400
Power
21.99%
4.548
Shin
22.34%
4.475
Away @ 7.00raw 14.29%
Proportional
13.64%
7.333
Power
12.83%
7.797
Shin
12.95%
7.724
The book is 4.76% over the odds. On the longest price, Away, fair odds run from 7.33 (proportional) to 7.80 (power), with Shin at 7.72. Proportional leaves outsiders too short.
On Betfair, back books sit just above 100% and lay books just below. That gap is competing offers, not a margin.
18+ only. Educational content, not financial or betting advice. Past results do not guarantee future returns. If gambling stops being fun, get free, confidential help at BeGambleAware.org.