Bonus Wagering Calculator

A casino bonus is one of the most misunderstood objects in online gambling. Operators quote a wagering multiplier the way clothing brands quote sizes — 35x, 45x, 60x — as if the number alone tells you anything useful. It doesn’t. Two 40x bonuses can behave completely differently once the max bet and game contribution enter the picture. The calculator below strips the marketing away and gives you the four figures that actually matter: how much you need to bet, how long it will take, and how much you can expect to lose along the way at two different RTPs.

What wagering really means

Wagering is not the amount you have to lose; it’s the total turnover you have to push through the games before the bonus balance converts to cash. A £100 bonus with a 35x wagering requirement means £3,500 in bets. The bets don’t have to be lost, they have to happen. Because slots typically pay back around 96% over the long run, £3,500 of turnover carries roughly £140 of expected loss, even if you play calmly and never chase.

That figure grows fast when the wagering is applied to deposit-plus-bonus rather than bonus alone. A “35x D+B” multiplier on a matched £100 offer is £7,000 of turnover, or about £280 of expected loss at 96% RTP. The headline number is the same. The workload is double. Any wagering calculator worth using has to expose that difference, which is why the tool below asks how the multiplier is applied.

Why max bet matters more than the multiplier

Every licensed bonus caps how much you can stake per spin while the wagering is unfinished. £5 is standard in 2026, £2 is common at the tighter end, and a handful of Nordic operators go down to £1. Break the cap once, even by accident, and the terms allow the operator to void the entire bonus balance. Max bet is the single most common bonus voider our review desk sees on player complaints.

The cap is not there to catch cheats. It exists to keep you at low volatility, small edges and long sessions, which is exactly where the house edge does its slowest, most reliable work. The calculator uses your max bet to estimate a realistic time-to-clear at 150 spins per hour, which is a normal pace for autoplay slots. If you plan to open a £5-max bonus and grind at £0.20 a spin, the clock stretches by twenty-five, and suddenly the deadline in the terms starts to matter more than the multiplier itself.

Game contribution, the hidden multiplier

Not every game clears wagering at the same rate. Slots almost always contribute 100% of every bet toward the wagering total. Live-dealer tables usually contribute 10-20%. Blackjack and video poker often clear at 5%. Some jackpot slots contribute zero. Change the contribution percentage in the calculator and you’ll see the effective wagering balloon: a 35x bonus played on a 10% live blackjack table is functionally a 350x bonus. That’s not a wagering requirement, it’s marketing furniture. For any bonus you actually want to clear inside its deadline, slots at 100% are the only realistic choice.

The calculator

How to use it

Enter the bonus amount you’re being offered, then whether the wagering applies to the bonus alone or to deposit-plus-bonus. Add the multiplier from the T&Cs, your intended max bet per spin, and the game contribution percentage for the games you plan to play. The four outputs update as you type. Compare them against the bonus deadline in the terms and against the money and hours you actually have available.

How to spot a trap

The most common bonus trap in 2026 is the “huge” offer with a wagering requirement designed to keep the balance stuck. If the expected loss at 96% RTP is bigger than the bonus itself, the offer isn’t a promotion, it’s a friction tax. Same for anything where the time-to-clear at your normal bet size runs longer than the deadline in the small print. And any bonus with a game contribution below 20% is designed to be admired, not cleared.

Wagering multipliers explained