UK Premium Bonds Calculator 2026 — NS&I Prize Estimator | Expected Returns

Premium Bonds are savings certificates from National Savings & Investments (NS&I) where your money is entered into monthly draws for prizes instead of earning interest.

Each £1 bond has a 1 in 21,000 chance of winning any prize each draw. Odds are higher for smaller prizes (£25-£50) and lower for jackpots (£1 million+).

NS&I holds monthly electronic draws with 4 draws per month. All held bonds enter automatically; no selection required. Prize draws are independent and random.

Premium Bonds offer lottery-style returns. Expected payout is lower than savings account interest (~50% of bond value paid as prizes). Use for risk/reward preference, not guaranteed returns.