If a conveyance is $4, then the % = 25% (ie it has a 25% chance of a return). To calculate this- 1/4 = .25
$2- 1/2= .5, $2.50- 1/2.5 etc...Basically, you divide the dividend by 1. In a field of 8, if all the % add up to be over 100%, that's the theoretical profit. If a bookie (Mal leave Thornton out of this

$1.00 100% $2.00 50% $3.00 33% $4.00 25% $18.00 6%
$1.05 95% $2.05 49% $3.05 33% $4.50 22% $19.00 5%
$1.10 91% $2.10 48% $3.10 32% $5.00 20% $20.00 5%
$1.15 87% $2.15 47% $3.15 32% $5.50 18% $21.00 5%
$1.20 83% $2.20 45% $3.20 31% $6.00 17% $22.00 5%
$1.25 80% $2.25 44% $3.25 31% $6.50 15% $23.00 4%
$1.30 77% $2.30 43% $3.30 30% $7.00 14% $24.00 4%
$1.35 74% $2.35 43% $3.35 30% $7.50 13% $25.00 4%
$1.40 71% $2.40 42% $3.40 29% $8.00 13% $26.00 4%
$1.45 69% $2.45 41% $3.45 29% $8.50 12% $27.00 4%
$1.50 67% $2.50 40% $3.50 29% $9.00 11% $28.00 4%
$1.55 65% $2.55 39% $3.55 28% $9.50 11% $29.00 3%
$1.60 63% $2.60 38% $3.60 28% $10.00 10% $30.00 3%
$1.65 61% $2.65 38% $3.65 27% $11.00 9% $31.00 3%
$1.70 59% $2.70 37% $3.70 27% $12.00 8% $32.00 3%
$1.75 57% $2.75 36% $3.75 27% $13.00 8% $33.00 3%
$1.80 56% $2.80 36% $3.80 26% $14.00 7% $34.00 3%
$1.85 54% $2.85 35% $3.85 26% $15.00 7% $35.00 3%
$1.90 53% $2.90 34% $3.90 26% $16.00 6% $36.00 3%
$1.95 51% $2.95 34% $3.95 25% $17.00 6% $37.00 3%