Investing in Premium Bonds

NS&I have reduced the prize fund rate slightly, down to 3.8% from 4.0% starting in April 2025. This calculator has been updated to reflect this new rate.

Your Investment

Winnings Each Month

0%10%20%30%40%50%60%70%80%90%100%Luck£0£25£50£100£125
In each draw, you'll need to be luckier than 63% of savers to win a prize.

Median Annual Winnings

£300 Over one year, with average luck, you'd win £300.

Median Interest Rate

3.00% £300 is equivalent to earning interest at a rate of 3.00%.

Mean Number of Prizes

5.5 On average, you'll win 5.5 prizes per year.

Jackpot Chance

1 in 542,118 This is your chance of winning the £1,000,000 jackpot over a year.
0%10%20%30%40%50%60%70%80%90%100%Luck£75£125£150£175£200£225£250£275£300£325£350£375£400£425£450£500£550
Over a year, you have an 80% chance of winning between £125 and £575 (1.25% and 5.75%).

About Premium Bonds

NS&I's Premium Bonds savings vehicle is unusual – it doesn't pay interest. Instead, savers purchase £1 bonds which are entered into a draw on the first of each month. NS&I publish a headline “annual prize fund interest rate” (from April 2025, 3.8%) but because of the way prizes are allocated most savers will not achieve this rate.

This website estimates an equivalent interest rate which you can use to compare Premium Bonds against other savings accounts or investments.