Current model parameters
| Parameter | Reviewed value |
|---|---|
| Prize fund rate | 3.80% |
| Odds per £1 Bond | 22,000:1 per monthly draw |
| Effective month | July 2026 |
| Last reviewed | 2026-08-09 |
Scenario calculator
Premium Bonds Odds and Winnings Calculator
Estimate the chance of at least one Premium Bonds prize and the average expected prize value for a holding and period you choose. Calculations use the dated NS&I parameters shown below: a 3.80% prize fund rate and 22,000-to-1 monthly odds per £1 Bond, effective from the July 2026 draw and reviewed on 9 August 2026.
Your scenario
Statistical outlook
In one month
Not available
Chance of at least one prize
Over 12 months
Not available
Chance of at least one prize
Chance of no prize over your period: Not available
Average expected prize value: Not available
Median outcome: Not available
Select a scenario to calculate an estimate from the verified parameters shown below.
How the estimate is calculated
- Validate the holding and period against the limits shown in the form.
- Apply the published monthly odds to each eligible £1 Bond and use the complement rule for at least one prize.
- Apply the dated annual prize fund rate to show average expected value for the selected period.
- Round displayed probabilities and currency only after the calculation.
The median needs a verified prize-distribution model, not only headline odds and rate. It remains unavailable until that input passes review.
Method and limitations
This tool uses only the inputs and dated parameters shown on the page. Estimates are not guaranteed returns. Average expected value, median outcome and your actual outcome are different. Confirm current product information directly with NS&I; this is not financial advice.