# Betfair Formulas

In this post I will be collecting all formulas that may be useful in Betfair trading.

**Profit for BACK bet**

Profit = Stake * (Odds – 1)

**Profit for LAY bet**

Profit = Stake

**Loss for BACK bet**

Loss = Stake

**Loss for LAY bet**

Loss = Stake * (Odds – 1)

**Deadheat profit/loss for BACK bet**

PL = (Stake / 2) * (Odds – 1) – (Stake / 2)

**Deadheat profit/loss for LAY bet**

PL = (Stake / 2) – (Stake / 2) * (Odds – 1)

**How to calculate LAY stake from given liability**

Stake = Liability / (Odds – 1)

**How to calculate BACK stake from given target profit**

Stake = Target Profit / (Odds – 1)

**How to calculate BACK stake for equal greening up**. Assuming that you have a lay bet at LayOdds and want to trade out at higher BackOdds to make a situation with equal profit for win and lose results.

LayWinPL = LayStake * (LayOdds – 1)

LayLoosePL = LayStake

BackStake = (LayWinPL + LayLoosePL) / BackOdds

**How to calculate LAY stake for equal greening up**. Assuming that you have a back bet at BackOdds and want to trade out at lower LayOdds to make a situation with equal profit for win and lose results.

BackWinPL = BackStake * (BackOdds – 1)

BackLoosePL = BackStake

LayStake = (BackWinPL + BackLoosePL) / LayOdds

**How to find a chance % of selection to win from it’s odds**

Chance = 100 / Odds

**How to convert fractions to decimal odds**

Fractions: A/B

Decimal = A / B + 1

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