What Does SP Mean in Horse Racing?

Last updated: 28/08/2026

You're looking at a racecard and half the runners have a price next to them. Then there's SP.

The SP meaning in horse racing is starting price: the official odds your bet settles at when the stalls open. Take it and you're agreeing to whatever that price turns out to be rather than locking in the number showing now, which can go either way for you.

So it's worth knowing how the starting price is actually put together, what you're agreeing to either way, and how Best Odds Guaranteed changes the picture at Midnite.

What does SP mean?

SP stands for starting price: the official odds returned for each runner at the moment a race starts. Bets placed at SP settle at that price rather than the odds showing when the bet was struck. It's compiled independently under Starting Price Regulatory Commission rules, not set by your bookmaker.

How is the starting price worked out?

The starting price is compiled under rules set by the Starting Price Regulatory Commission, an independent body whose job is making sure the returned price genuinely reflects what was on offer at the off.

So not by the bookmaker you bet with, which is the part most people don't realise.

The SPRC doesn't price up the races itself, and it doesn't set anyone's margins. What it does is write the rules the SP has to be calculated under, then check the bookmakers and the SP validators are working inside them.

The SP is no longer taken purely from the on-course betting ring, though plenty of guides still describe it that way.

The SPRC reviewed how the SP was composed across 2020 and 2021 and found only 1.4% of British horse race betting was happening on-course. An SP generated purely from the ring no longer reflected the market it was meant to represent.

The result was a new system: based in the majority on off-course bookmaker prices, while still carrying an element that reflects the on-course market.

So the SP you get today is drawn largely from where the betting actually happens. If you read elsewhere that it comes from the bookmakers standing at the track, that description is a few years out of date.

What happens when you bet at SP?

What does SP mean on a horse betting slip in practice? It means you haven't taken a price, so you get whatever gets returned at the off. That can go either way, so here it is both ways.

Say you back a horse with £10 and the price showing is 5/1.

Take the price and you know what you're getting. Take SP and you accept whatever the market settles on, shorter or longer.

Reading prices is the skill underneath all of this, and betting odds explained plus how decimal odds work cover both formats.

Taking a price vs taking SP: what's the difference?

Taking a price locks your odds when you bet. Later moves don't affect you either way: drift from 5/1 to 8/1 and you still get 5/1, backed in to 2/1 and you still get 5/1.

Taking SP leaves your price open, so late money moves your return with it.

Prices move for all sorts of reasons: weight of money, non-runners, ground changes. Neither approach produces better returns over time, and timing a bet is not a strategy. All that differs is what you're agreeing to.

SP and Best Odds Guaranteed at Midnite

Best Odds Guaranteed pays you at the starting price when the SP is bigger than the price you took. Most bookmakers run it as a standard feature for everyone, and ours works differently.

Best Odds Guaranteed at Midnite is available by invitation only. Eligible customers are notified by Midnite. It isn't applied to every account by default.

If you are eligible:

What it does. Take a price, and if the returned SP is bigger you're paid at the higher SP.

Where it applies. UK and Irish horse racing only. Greyhound racing and racing in all other territories are excluded.

Which bets qualify.

• Bets placed from 9:00am on the day of the race. Anything earlier isn't eligible.
• Pre-race bets only. In-play bets don't qualify.
• Win and each-way bets, in both singles and multiples.

What's excluded.

• Boosted odds and special markets.
• Antepost bets.
• Races where Midnite is running another promotion, for example Extra Places.

The cap. The maximum additional payout from Best Odds Guaranteed is £50,000 per customer per day. Anything above that isn't credited.

If you use price boosts, the two don't stack. A boosted price is already enhanced, and Best Odds Guaranteed won't then top it up to SP. [Pending publish: /blog/what-is-odds-boost]

What does SP mean in betting outside racing?

What does SP stand for in betting anywhere else? Starting price, same as on the racecard, but it's a racing convention first.

You'll occasionally see it used loosely in other sports for the price at the start of an event. There's no equivalent independently compiled starting price outside racing, so check what's actually on offer rather than assuming the same mechanism applies.

Other racing price terms you'll see

EVS means evens, a price where you win the same amount you stake. A £10 bet at evens returns £20.

Each-way splits your stake: half on the win, half on the horse placing, with terms set per race. It costs double a win-only bet, and what each-way means covers the terms.

Forecast names the first two home in order. Tricast wants the first three.

BF in a horse's form figures means beaten favourite: went off favourite last time and didn't win.

How SP works on Midnite

SP betting is available on horse racing at Midnite, so you can take the price showing or take SP on the racecard.

SP bets settle once the official starting price is returned after the off. That applies inside multiples too, so an SP leg in a treble or a Lucky 15 settles at the returned price and changes what the total odds come out as.

Cash out values are calculated from current prices, so an SP bet has no fixed price to value against until the SP is returned.

The full card is on Midnite's horse racing, with horse racing tips, the nap of the day and our best racing tipsters as related reading. Price movement works similarly in football, covered in best odds football UK.

FAQs

What happens if you bet on SP?

Your bet settles at the official starting price returned when the race goes off, rather than the price showing when you placed it. That can be bigger or smaller. If you're eligible for Best Odds Guaranteed and took a fixed price shorter than the SP, you're paid at the SP instead.

What does SP mean in horses?

Starting price: the official odds returned for a runner at the moment the race begins, compiled independently under SPRC rules.

What is an SP payout?

A payout calculated at the returned starting price rather than a price you locked in earlier. A £10 win bet on a horse returned at 6/1 pays £70.

How is the SP calculated?

Under Starting Price Regulatory Commission rules, from a sample of bookmaker prices at the off. Since the SPRC's 2020 to 2021 review, that sample is based in the majority on off-course prices while still reflecting the on-course market.

SP, in plain terms

SP is the official price a race settles at, compiled independently rather than set by your bookmaker, and drawn today mostly from off-course markets rather than the ring.

Take a price and you know your return. Take SP and you find out at the off.

Best Odds Guaranteed can pay the bigger of the two, but at Midnite it's invitation only, UK and Irish racing, from 9am on race day, with boosted odds and antepost excluded.

The full card is on Midnite's horse racing.

Whichever way you take your price, the stake is the part you control, so settle on one you'd be content to lose before the race rather than after it. Limits and time-outs are in the Responsible Play collection.

18+, please gamble responsibly.

About the author

Ben Cullen is Head of Risk at Midnite, where he leads the team that prices the markets and manages the sportsbook's exposure.

He has spent 12 years in trading and risk, previously at Ladbrokes Coral, ComeOn and KingMakers.

He writes here on how betting markets are actually built, priced and settled.

Connect with Ben on LinkedIn.