## Betfair Odds

Everything I know about Betfair odds.

1. Betfair displays odds in decimal format, i.e. 2.00, 4.20, 10.5.

2. Betfair odds can be anything between 1.01 and 1000.

3. Winnings for BACK bet are equal to Stake * (Odds – 1).

4. Your bet will be matched at best available odds. For example, if you place BACK bet at 1.80 and there is money at 2.00, your bet will be matched at 2.00 instead 1.80.

5. Odds are often called “prices” on Betfair betting exchange.

6. On Betfair there are specific odds ranges with own minimum increments. These minimum increments usually called “ticks”.

From 1.01 to 2.00 one tick is equal to 0.01.

From 2.02 to 3.00 one tick is equal to 0.02.

From 3.05 to 4.00 one tick is equal to 0.05.

From 4.1 to 6.0 one tick is equal to 0.1.

From 6.2 to 10.0 one tick is equal to 0.2.

From 10.5 to 20.0 one tick is equal to 0.5.

From 21 to 30 one tick is equal to 1.

From 32 to 50 one tick is equal to 2.

From 55 to 100 one tick is equal to 5.

From 110 to 1000 one tick is equal to 10.

So there are no 2.21 odds on Betfair, instead there are 2.20 and 2.22 odds. Odds like 4.15, 6.7, 22.5, 57, 995 are all invalid on Betfair. If you try to place a bet at these odds it will be rejected.

7. You can see the latest prices on Betfair only if you have an “active funded account”. Otherwise Betfair will show prices with small latency and they will be outdated. Here is what Betfair writes about this on it’s site:

Only customers logged into an active funded account will be able to view the latest Betfair prices. We do this to discourage extreme usage of Betfair website data by software programs that don’t use Betfair to bet. Your account becomes an ‘active funded account’ the first time you make a deposit.

## 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

## Betfair Betting

Today the online sports betting is most promising. No need to go out to place your wager. You can bet sitting at home, thanks to online exchange services like Betfair. Moreover you can trade, just like on a stoke market. Betfair allows you to make a “Back” bet to win and “Lay” bet to lose. This means that if your selection loses you actually make money. So placing, for example, two opposite bets (Back and Lay) on the same selection, but at different odds you are making guaranteed profit which is as big as the difference in odds between Back and Lay bets. This is very similar to normal stock markets, that’s why many traders in online sports betting are saying “price” instead “odds”. And sports events are usually called “markets”.

If you open Betfair market in your browser, you will see what I mean:

If it’s your first time at Betfair, you may need to click “Exchange” link on the top (next to “Live Video”, “Radio” and “Tote”). Also make sure you have ticked “Back & Lay” and “Market Depth” boxes. Without this your market will look like an ordinary race form.

So, on the above image you see three Back and three Lay boxes for each runner with available odds (prices) and amount of money available at this odds. As long as Betfair is betting exchange where people bet one against another, the amount that can be matched at BACK odds is limited by amount that other people are offering to trade at this odds. In our example if you would have placed a BACK bet of $200 at 4.8, $197 would have been matched and $3 have remained unmatched until someone would place a LAY bet at this odds.

From trading point of view you can think about BACK betting as “selling” and LAY as “buying”. So to make profit you should “buy” at low price and sell at high price (the order doesn’t matter really, you can first sell and then buy). Sports betting markets on Betfair are volatile, prices usually change up and down in matters of minutes. When a race goes in-play prices can dramatically change even in fractions of second. In Betfair trading it’s matter of good analysis and timely decision to be successful.

If you have backed $200 at 4.8 and then the price on Betfair went down to 4.0 you can trade out laying at 4.0. You might lay $200 at 4.0, then if the horse loses you will make (less Betfair commission):

$200 * (4.8 – 1) – $200 * (4.0 – 1) = $160

Betfair displays all odds in decimal format.

To calculate profit from a BACK bet the formula is:

profit = stake * (odds – 1)

Loss formula for LAY bet is the same:

loss = stake * (odds – 1)

Well, this is very basic of Betfair trading. Good luck, and happy trading!