Omaze House Draw Odds: Why You Cannot Calculate Them, and What You Can

Omaze has a five-bedroom Victorian house in Mapesbury, north London on the table — valued at £3.5 million, with £250,000 in cash alongside it. Online entries close on Sunday 27 September 2026, postal entries on Tuesday 29 September, and Omaze guarantees a donation of at least £1,000,000 to London’s Air Ambulance Charity.

The question we get asked every time one of these launches is simple: what are the odds? The honest answer is that nobody can tell you — and that is worth understanding properly, because it is the single biggest structural difference between Omaze and the sites on this platform.

Fixed Pool vs Open-Ended

Almost every competition we track is a fixed-pool draw. The operator says up front: 5,000 tickets, £1 each, drawn on this date. That one number lets you calculate your exact chance before you spend anything. Five tickets in a 5,000-ticket pool is 1 in 1,000. No ambiguity.

Omaze runs an open-ended draw. There is no cap on entries, so the total is not knowable until the draw closes — not by you, and not by Omaze either while it is running. This is not a transparency failure so much as a different product. It is the same reason nobody can tell you your odds in a National Lottery rollover until the tickets are counted.

It is worth noting Omaze is a signatory to the Voluntary Code of Good Practice, which asks operators to state the likelihood of winning “where possible”. For an uncapped draw, that qualifier is doing a lot of work.

What You Can Work Out

You cannot calculate your odds, but you can calculate your cost per entry — and that is the only lever you actually control.

Option	Entries	Cost per entry
£10 one-off	15	66.7p
£150 one-off	320	46.9p
£10 per month subscription	65	15.4p
£50 per month subscription	640	7.8p
Free postal entry	1	Cost of a stamp

Two things fall out of that. The bulk tiers cut your per-entry cost by roughly a third. The subscriptions cut it by around 85% — which is the whole point of them from Omaze’s side, and worth being clear-eyed about before you sign up to a recurring payment for a house you probably will not win. And the postal route carries the same chance as any single paid entry, which makes it the only route with a genuinely calculable value.

How That Compares to a Fixed-Pool Car Draw

For contrast: across the live car competitions we track, the median ticket is 49p against a median pool of around 200,000 tickets, at a median Value Ratio of 2.50. You can state your odds to the decimal place before you pay, and you can compare one draw against another on identical terms. That is what the car competition league table is for.

You cannot do that with Omaze, so any “Omaze vs competition sites” value comparison you see online is guesswork dressed up as maths.

So Is It Worth Entering?

It depends what you are buying. The charitable donation is real and contractually guaranteed — at least £1m to London’s Air Ambulance from this draw, which is a meaningfully different proposition from a commercial operator where the margin is simply the margin. If you would have donated anyway, the entry is close to free.

If what you want is a stated probability before you hand over money, an uncapped house draw is structurally the wrong product, and a fixed-pool comp is the right one. And if you want the house but not the uncertainty about value, the postal route costs a stamp and counts the same — see our guide to free entry competitions.

Whatever you enter, know the number before you pay. The odds calculator takes ten seconds.