300% Casino Bonus and Up!

Welcome to the ultimate destination for high rollers and bonus hunters! If you’re looking for the biggest and boldest casino bonuses on the market, you’ve come to the right place. We specialize in bringing you the best 300% and up bonuses from the most trusted online casinos.

But we’re not just about the numbers, we know that a great bonus is about more than just the percentage. That’s why we hand-pick only the best offers with fair terms and high-quality casinos.

What is a 300% casino bonus and how is it calculated?

A 300% casino bonus is a promotion offered by online casinos to attract new players or reward loyal ones. It means that for every pound you deposit, the casino will add an additional 3 pounds to your bonus balance, up to a certain limit. For example, if you deposit 50 pounds, you will receive an additional 150 pounds in bonus funds, for a total of 200 pounds to play with.

To calculate the bonus amount, you can use the following formula:

Bonus amount = Deposit amount x Bonus percentage

So, in the example above, the bonus amount would be calculated as follows:

Bonus amount = 50 pounds x 300% = 150 pounds

Keep in mind that most casino bonuses come with certain terms and conditions that you must meet in order to be able to withdraw any winnings. These may include a minimum deposit amount, a wagering requirement, and a maximum cashout limit.

What are wagering requirements?

Keep in mind that most casino bonuses come with certain terms and conditions that you must meet in order to be able to withdraw any winnings. These may include a minimum deposit amount, a wagering requirement, and a maximum cashout limit.

For example, if the wagering requirement for the 300% bonus is 40x, you would need to wager the bonus amount (150 pounds) 40 times before you can withdraw any winnings. This means you would need to place bets totaling at least 6,000 pounds before you can request a withdrawal.

It’s important to read and understand the terms and conditions of any casino bonus before you claim it, so you know exactly what you are getting and what you need to do in order to take advantage of it.

Betfred Sports

Betfred Sports

Welcome Bonus

Deposit £10 and get £30 Bonus + 50 Bonus Spins

  • Payment PayPal, paysafecard, PayPal, paysafecard + 10 more
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Welcome offer Stake £10 Get £40 in Bonuses, given as £30 in Free Bets and 50 Free Spins. New 18+ UK customers only. Register using the promo code WELCOME40, deposit and place first bet of £10+ on Sports (cumulative Evens+) within 7 days of registration. First bet must be on Sports. £30 in Free Bets and £10 in Free Spins (50x20p) credited within 10 hours of bet settlement. The 50 Free Spins can only be used on the following titles at Betfred Games: Eye of Horus, Eye of Horus Megaways, Fishin’ Frenzy, Fishin’ Frenzy Megaways. Free Bet stakes are not included in any returns. Bonuses have a 7-day expiry. Payment restrictions apply. SMS verification and/or Proof of I.D and address may be required. Full T&Cs apply.

BetVictor Casino

BetVictor Casino

Welcome Bonus

Deposit £10 and get £30 Bonus + 100 Bonus Spins

  • Payment PayPal, PayPal + 5 more
  • Games Providers Microgaming, NetEnt + 19 more
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Welcome offer wager £10 and get £30 in bonuses and 100 Free Spins for Fishin ‘Frenzy. New customers only. Deposit, opt in and wager £10 on selected games within 7 days of opening new account. Receive 3 x £10 for selected games with up to 40x wagering plus 100 Free Spins. Bonuses expire in 7 days. Maximum Redeemable from bonuses £750. 100 Free Spins have no wagering and expire in 7 days. Card payments only. T&Cs Apply.

Cash Spins

Cash Spins

Welcome Bonus

300% Bonus Up To £1,000 + 75 Bonus Spins

  • Payment paysafecard, paysafecard + 26 more
  • Games Providers Microgaming + 39 more
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Welcome offer 300% bonus up to £1000 and 75 zero wager spins on 7 Fortune Frenzy. New players only. This is part of a welcome package worth up to £1750 and 150 spins over 1st 3 deposits. Minimum deposit £20. Cash spins have no wagering requirement. The Welcome Package is subject to 33x wagering requirement at each stage of the 3 bonuses. Full terms apply.

Eclipse Casino

Eclipse Casino

Welcome Bonus

£20 No Deposit Required - 300% Bonus Up To £3,000 + Free Spins No Deposit

  • Payment paysafecard, paysafecard + 7 more
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Welcome offer £20 Free Chip on sign-up, no deposit required. Plus 300% Slots Match up to £3000 and 100% Cashback on first 3 deposits.
Free Chips: use bonus code WINALOT20. Code is valid once for new players on slots and specialty games only. PT x50. Maximum cash out x2 the bonus amount.
Deposit Bonus: Use code ECLIPSE300. Valid on the first three deposits. Minimum deposit £25+ on slots and specialty games only. PT X 40, no maximum cashout. Cashback is given in the form of a Free Chip, PT x50, maximum cash out x5, to be claimed in Live Chat. Terms apply.

Golden Lion Casino

Golden Lion Casino

Welcome Bonus

300% Bonus Up To £3,000 + Bonus Spins

  • Payment paysafecard, paysafecard + 9 more
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300% Welcome Bonus up to £3000 and 10% Cashback on 1st deposit using code ROAR300. Code is valid once for new players only, on deposit £25. PT x40, no maximum cash-out, valid on slots and specialty games only. Cashback is given in a form of a Free Chip, PT x50, maximum cash out x5, to be claimed in Live Chat. Terms apply

Harry’s

Harry’s

Welcome Bonus

300% Bonus Up To £2,500 + Bonus Spins

  • Payment Klarna + 12 more
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Welcome package offering 650% up to £5000 over 3 deposits, starting with 300% Bonus up to £2500 on 1st deposit. New players only. Bonus Code WELCOME1 required. Minimum deposit £25. Welcome Casino Package Bonuses are subject to WR 50x within 10 days of bonus activation. Welcome Casino Package is only for Slots for the providers: Evoplay, Booongo, Spinomenal, Betsoft, Saucify. Full terms apply

Lady Linda Casino

Lady Linda Casino

Welcome Bonus

300% Bonus Up To £1,000 + Bonus Spins

  • Payment Klarna + 12 more
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Welcome offer 300% up to £1000. New players only. Deposit code LADYWB required. Minimum deposit £25. Welcome Casino Bonus can be used on slots and only on the following Providers: Evoplay, Booongo, Spinomenal, Betsoft, Saucify. Welcome Casino Bonus is subject to WR 45x. Full terms apply.

Luck of Spins

Luck of Spins

Welcome Bonus

300% Bonus Up To £1,200 + Bonus Spins

  • Payment Klarna + 6 more
  • Games Providers NetEnt, Microgaming + 54 more
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Welcome offer 300% Bonus up to £1200. New registrations only, 1st deposit only. Minimum deposit £25. Maximum Bonus £1200. Welcome Casino Bonus can be used on slots and only on the following Provider: Egt, Netent, Novomatic, Play n go, Pragmatic, Amatic. Bonus amount is subject to a wagering requirement of 45x within 45 days. General Terms and Conditions apply.

Nevada 777

Nevada 777

Welcome Bonus

300% Bonus Up To £10,000 + 50 Bonus Spins

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    Welcome offer 300% Bonus up to £10000 and 50 Free Spins on 1st deposit. PLUS Claim 300% and 50 Free Spins again on the 2nd deposit. Coupon code WELCOME1 required. Minimum deposit £20. Free spins valid on Cash Bandits 3. WR 20x deposit + bonus amount. Winnings from Free Spins will be subject to wagering of 45x. Full terms apply.

    Platinum Club VIP

    Platinum Club VIP

    Welcome Bonus

    300% Bonus Up To £3,000 + Bonus Spins

    • Games Providers NetEnt + 32 more
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    Welcome offer 300% Bonus up to £3000. PLUS Claim 400% Reload Bonus up to 10 times per week. Welcome offer Deposit Code WELCOME300. New registrations, 1st deposit only. Minimum deposit Minimum deposit £25. Welcome Bonus can be used on slots and only on the following Providers: Egt, Netent, Novomatic, Play n go, Pragmatic, Amatic. Bonus is subject to wagering requirement of 40x. Full terms apply.

    RedRose Casino

    RedRose Casino

    Welcome Bonus

    300% Bonus Up To £200 + 150 Bonus Spins

    • Payment paysafecard, paysafecard + 22 more
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    Welcome offer €1200 bonus and 150 free spins over 4 deposits, starting with 300% bonus up to €200 and 150 free spins on 1st deposit. New players only. Minimum deposit £10. Free spins valid on Betsoft games. WR 40x sum of deposit + bonus before withdrawing any amount higher than your initial deposit. Full terms apply.

    Slots n Roll

    Slots n Roll

    Welcome Bonus

    300% Bonus Up To £5,000 + 50 Bonus Spins

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      Welcome offer 600% Bonus and 100 Free Spins over your 1st 2 deposits, starting with 300% Bonus and 50 Free Spins on Cash Bandits 3 on 1st deposit. Coupon code WELCOME1 required. Min deposit £20. Maximum Bonus £5000. Maximum winnings from Free Spins £50. WR Bonus 20x. WR Free Spins winnings 45x. Full terms apply.

      Sports And Casino

      Sports And Casino

      Welcome Bonus

      300% Bonus Up To £150 + 100 Bonus Spins

      • Payment paysafecard, paysafecard + 8 more
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      Welcome offer 300% deposit match up to £1500 and 100 free spins. New players only. Minimum deposit £25. WR 30x deposit + bonus. Free spins credited as 10 per day over 10 days. WR 30x applies to FS winnings. FS can be used on specified games only including Mystic Wolf, Five Times Wins and Jumping Jaguar. Free spins are only availabe to players who have not already won and requested a withdrawal. Full terms apply. Players who wish to deposit using Bitcoin can claim a 500% welcome bonus.

      Ultima Casino

      Ultima Casino

      Welcome Bonus

      300% Bonus Up To £3,000 + Bonus Spins

      • Games Providers NetEnt + 40 more
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      Alternative welcome offer for those wanting to make a bigger deposit - 300% Bonus up to £3000. New players, 1st deposit only. Opt in required. Minimum deposit £250. Maximum bonus £3000. Welcome Casino Bonus can be used on slots and only on the following Provider: Egt, Netent, Play n go, Amatic. Bonus amount is subject to a wagering requirement of 45x within 45 days. Minimum bet amount to count toward the wagering requirement is £0.50 and maximum is £20.00. General Terms and Conditions apply. A Reload Bonus is available of 150% up to £1000 and can be claimed up to 8 times per week with a £250 minimum deposit and 40x WR.