What Does SP Mean in Horse Racing? Starting Price Rules
Taking a price locks your odds and gives up the drift. Taking SP hands the number to a published algorithm run by an independent commission, and that algorithm is the part almost no guide explains.
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What SP means on a bet slip
Every British racing bet slip offers the same fork. Sky Bet states it plainly:
“When placing a bet on Horse Racing you can select from two available pricing options - the price the selection is at time of placement OR the Starting Price (SP).”
Pick the second option and the price on the screen is only an indication. The number that settles your bet is the one returned at the off:
“Starting Price means that whatever odds your selection is at the start of the race are the odds you will receive for your bet.”
Pick the first option and the SP becomes irrelevant to your return, with one important exception covered further down:
“Selecting to bet at anything other than SP will result in settlement being calculated from the price taken at time of placement”
Who decides the SP
The SP is not compiled by the firm holding your bet. An independent body sets the parameters and validates the result:
“The Starting Price Regulatory Commission (SPRC) is an independent body responsible for the integrity and accuracy of the starting price (SP).”
Its remit is deliberately narrow. It polices the mechanism, not the prices:
“The SPRC does not set individual prices, overrounds or margins, nor does it set targets for what they should meet.”
The source of those prices changed in the last few years, and the reason is a single number:
“The review concluded that with only 1.4% of British horse race betting taking place on-course, an exclusively on-course generated SP was no longer accurately reflective of the betting market.”
That is why the traditional picture of bookmakers shouting in the ring no longer describes where your SP comes from. The sample now reflects the off-course market where the betting actually happens.
The SP also does not appear the instant the tapes go up:
“The SPs are not confirmed immediately.”
“The SP Validator will first check that there are no obvious technical issues before confirming and submitting them to the system.”
A short delay between the off and the SP appearing on a results page is the validation step, not an error.
The median rule, worked through
This is the published algorithm, in two sentences:
“For each horse in a race the prices on offer by all bookmakers in the sample are ordered into a list from longest to shortest.”
“The list is then divided into two equal halves and the SP is the shortest odds available in the half containing the longest odds.”
Run it on a six-firm sample for one horse. Order the prices from longest to shortest, split the list in two, and read the bottom of the top half.
| Sampled price, longest first | Decimal | Half of the list | Role in the calculation |
|---|---|---|---|
| 9/2 | 5.50 | Longer half | In the half that decides the SP |
| 4/1 | 5.00 | Longer half | In the half that decides the SP |
| 4/1 | 5.00 | Longer half | Shortest in that half, so this is the SP |
| 7/2 | 4.50 | Shorter half | Ignored by the rule |
| 7/2 | 4.50 | Shorter half | Ignored by the rule |
| 10/3 | 4.33 | Shorter half | Ignored by the rule |
- Decimal
- 5.50
- Half of the list
- Longer half
- Role in the calculation
- In the half that decides the SP
- Decimal
- 5.00
- Half of the list
- Longer half
- Role in the calculation
- In the half that decides the SP
- Decimal
- 5.00
- Half of the list
- Longer half
- Role in the calculation
- Shortest in that half, so this is the SP
- Decimal
- 4.50
- Half of the list
- Shorter half
- Role in the calculation
- Ignored by the rule
- Decimal
- 4.50
- Half of the list
- Shorter half
- Role in the calculation
- Ignored by the rule
- Decimal
- 4.33
- Half of the list
- Shorter half
- Role in the calculation
- Ignored by the rule
The SP is 4/1, not the 7/2 that three of the six firms were showing and not the 9/2 top price. The commission states the guarantee that falls out of the rule:
“The SP or a longer price will have been offered by at least half the bookmakers in the sample.”
Settlement laboratory
An SP bet settles on the returned number, not the screen price
return = stake × (SP as decimal)The same bet taken at the 7/2 board price would have returned £90. The £10 difference is the whole argument for and against taking a price, and it runs in both directions.
The rule has a consequence worth naming. Because the SP is drawn from the longer half, it is systematically kinder than the shortest price in the sample and meaner than the longest. Shopping for the best price beats SP whenever the horse holds its odds. SP beats a taken price whenever the horse drifts.
Which bookmakers are in the sample
The sample is not fixed at a set list for every race:
“will usually consist of (a normal minimum of) six bookmakers”
“There is no maximum sample size.”
Qualifying to be in it has a published size threshold, which is what keeps a tiny operator from moving the price the whole country is settled at:
“Any price source provider must reasonably be expected to constitute a minimum of 1.5% of the total betting market for British horse racing.”
And there is a floor below which no SP exists at all:
“No SP will be returned if for any reason a sample of prices from 3 bookmakers cannot be achieved.”
That last rule is the one to remember when a results page shows no SP against a runner. It is a defined outcome of the mechanism, not a missing data field, and your operator's own rules then decide what your unpriced bet settles at. Betfair publishes its fallback:
“bets where no price is taken (including forecasts, tricasts and unnamed favourites) will be settled at the last price quoted on the Betfair Sportsbook prior to the off of the race”
SP against a price you took
The two prices you can be offered before SP have different names and different windows. Sky Bet publishes the changeover:
“Once time is into the 15 minutes prior to a race, the prices displayed as alternatives to Starting Price (SP) are known as 'Board' Prices.”
| How the bet was struck | Settles at | What still moves the number |
|---|---|---|
| Early price, taken in the morning | The price on the slip | Rule 4 if a runner is withdrawn, and Best Odds Guaranteed where the offer applies |
| Board price, inside the last 15 minutes | The price on the slip | Rule 4 if a runner is withdrawn, and Best Odds Guaranteed where the offer applies |
| SP, no price taken | The returned Industry SP | Rule 4 if a runner is withdrawn. Best Odds Guaranteed has nothing to improve |
| Bet accepted after the off, betting still open | The last available odds | Published as the SP for that selection |
| Ante-post, before final declarations | The ante-post price | SP is not offered on these markets |
- Settles at
- The price on the slip
- What still moves the number
- Rule 4 if a runner is withdrawn, and Best Odds Guaranteed where the offer applies
- Settles at
- The price on the slip
- What still moves the number
- Rule 4 if a runner is withdrawn, and Best Odds Guaranteed where the offer applies
- Settles at
- The returned Industry SP
- What still moves the number
- Rule 4 if a runner is withdrawn. Best Odds Guaranteed has nothing to improve
- Settles at
- The last available odds
- What still moves the number
- Published as the SP for that selection
- Settles at
- The ante-post price
- What still moves the number
- SP is not offered on these markets
The in-running row is a rule people meet by accident when a bet lands a second after the tapes:
“If betting is available during a race, then the SP will be the last available odds for the selection.”
Industry SP is not the only SP
Three different numbers travel under the letters SP, and mixing them up is the most common way to misread a settled bet.
Industry SP. The number returned under the commission's rules for British racing, used to settle fixed-odds bets. This is what "SP" means without a qualifier.
Betfair SP. A separate exchange mechanism with its own price. Betfair's own sportsbook rules draw the line between the two:
“'SP bets' placed on the Betfair Sportsbook or Betfair's 'Fixed Odds' products will be settled on the official Industry Starting Price and not the 'Betfair SP'.”
An operator's own SP on racing outside Britain and Ireland. Where no industry SP is returned, the letters mean whatever that operator's rules say. Sky Bet's US racing terms are explicit:
“Starting Prices will be a Sky Bet SP, determined by the last available price provided by the Press Association (PA)”
When SP decides money you already priced
Taking a price does not always take you out of the SP. Four common cases put the returned SP back into your settlement.
- Best Odds Guaranteed. The promotion pays the bigger of your taken price and the SP, which makes the SP the ceiling on the bet you thought was fixed.
- Unnamed favourite bets. The favourite is defined by the SP returns, not by the morning market. Betfair states the test:
“The favourite is the selection quoted in the official starting price returns at the shortest odds.”
- Forecasts and tricasts. Operator rules group these with unnamed favourites as bets where no price is taken, so they are decided by the returned prices and the published industry dividends rather than by anything on your slip.
- Rule 4 on an SP bet. A withdrawal after final declarations reduces winnings on SP bets as well as on taken prices. The deduction scale and the recalculation live on the Rule 4 deductions page.
SP settlement check
Run this when a settled SP bet returns less than you expected.
- Confirm the bet slip says SP rather than a taken price. A board price taken at 7/2 does not become 4/1 because the SP did.
- Read the returned SP from the official result, not from the last price you saw on screen before the off.
- If your bet was accepted after the off, expect the last available odds rather than the market price at the tapes.
- Check whether a runner was withdrawn after final declarations, which puts a Rule 4 deduction on the winnings.
- If you took a price and the SP was bigger, check whether Best Odds Guaranteed was live on that bet.
- If the results page shows no SP, check the three-bookmaker floor before assuming a data error, then read your operator's fallback rule.
- On non-British racing, confirm whose SP definition applies before comparing it with an industry SP.
A return that survives all seven steps is the published mechanism working. One that fails step two or step four is a documented question to put to the operator in writing, with the SP return and the settlement side by side.
Ownership boundary
This page owns what the SP is, who compiles it and how it is calculated. Neighbouring pages own the rest:
- Rule 4 deductions explained for the deduction scale and the recalculated return after a withdrawal.
- Fractional odds explained for converting the fractions used in the sample.
- Tote betting explained for pool dividends, which are a different number from an SP.
The SP can still be cut after you back a horse
A withdrawal after final declarations takes a fixed amount out of the winnings on an SP bet exactly as it does on a taken price. The size depends on the withdrawn runner, not on yours.
Evidence manifest5 primary sources mapped to this guideView sources
Each source below is retained with the claims it supports. Operator sources describe published terms, not independent first‑hand performance.
- Starting Price Regulatory Commission, rules for returning the SP (opens in a new tab)
- For each horse in a race the prices on offer by all bookmakers in the sample are ordered into a list from longest to shortest.
- The list is then divided into two equal halves and the SP is the shortest odds available in the half containing the longest odds.
- The SP or a longer price will have been offered by at least half the bookmakers in the sample.
- will usually consist of (a normal minimum of) six bookmakers
- No SP will be returned if for any reason a sample of prices from 3 bookmakers cannot be achieved.
- Any price source provider must reasonably be expected to constitute a minimum of 1.5% of the total betting market for British horse racing.
- There is no maximum sample size.
- Starting Price Regulatory Commission, about us (opens in a new tab)
- The Starting Price Regulatory Commission (SPRC) is an independent body responsible for the integrity and accuracy of the starting price (SP).
- The SP is used in the settlement of bets on British horseracing struck with licensed bookmakers in betting shops or through their websites.
- The SPRC does not set individual prices, overrounds or margins, nor does it set targets for what they should meet.
- The review concluded that with only 1.4% of British horse race betting taking place on-course, an exclusively on-course generated SP was no longer accurately reflective of the betting market.
- Starting Price Regulatory Commission, FAQ (opens in a new tab)
- The starting price (SP) is determined by an algorithm publicly available on the homepage of our website.
- The SPs are not confirmed immediately.
- The SP Validator will first check that there are no obvious technical issues before confirming and submitting them to the system.
- Sky Bet help centre, horse racing rules (opens in a new tab)
- Starting Price means that whatever odds your selection is at the start of the race are the odds you will receive for your bet.
- When placing a bet on Horse Racing you can select from two available pricing options - the price the selection is at time of placement OR the Starting Price (SP).
- Selecting to bet at anything other than SP will result in settlement being calculated from the price taken at time of placement
- If betting is available during a race, then the SP will be the last available odds for the selection.
- Once time is into the 15 minutes prior to a race, the prices displayed as alternatives to Starting Price (SP) are known as 'Board' Prices.
- Starting Prices will be a Sky Bet SP, determined by the last available price provided by the Press Association (PA)
- Betfair Sportsbook horse racing rules (opens in a new tab)
- 'SP bets' placed on the Betfair Sportsbook or Betfair's 'Fixed Odds' products will be settled on the official Industry Starting Price and not the 'Betfair SP'.
- The favourite is the selection quoted in the official starting price returns at the shortest odds.
- bets where no price is taken (including forecasts, tricasts and unnamed favourites) will be settled at the last price quoted on the Betfair Sportsbook prior to the off of the race
FAQ
What does SP mean in horse racing?
SP means starting price, the odds returned for each runner at the moment the race starts. Bets placed without taking a price are settled at that number, and it is compiled from a sample of bookmakers rather than set by the firm holding your bet.
How is the starting price calculated?
The sampled prices for a runner are ordered from longest to shortest, the list is split into two equal halves, and the SP is the shortest price in the half containing the longest odds. At least half the sampled firms will have been showing the SP or a bigger price.
How many bookmakers decide the SP?
A sample normally contains a minimum of six, there is no maximum, and no SP is returned at all if prices from three bookmakers cannot be obtained. Each qualifying firm must account for at least 1.5 per cent of the British racing betting market.
Is it better to take a price or bet at SP?
Taking a price wins when the horse shortens and loses when it drifts. Because the SP is drawn from the longer half of the sample, it beats the shortest prices on offer at the off, so a taken price only wins if it was better than the eventual SP.
Is Betfair SP the same as SP?
No. Betfair SP is a separate exchange mechanism. Betfair's own sportsbook rules state that SP bets there settle on the official Industry Starting Price and not on Betfair SP.