Last updated: April 2026
29 Jan 2026 - 2 Feb 2026
12 Feb 2026
7 Feb 2026 - 13 Feb 2026
| Cycle | Period dates | Ovulation | Fertile window |
|---|---|---|---|
| 1 | 29 Jan 2026 - 2 Feb 2026 | 12 Feb 2026 | 7 Feb 2026 - 13 Feb 2026 |
| 2 | 26 Feb 2026 - 2 Mar 2026 | 12 Mar 2026 | 7 Mar 2026 - 13 Mar 2026 |
| 3 | 26 Mar 2026 - 30 Mar 2026 | 9 Apr 2026 | 4 Apr 2026 - 10 Apr 2026 |
This calculator provides an estimate only. Period dates and ovulation timing can vary and should not replace medical advice.
The next period is estimated by adding your average cycle length to the first day of your last period.
Longer cycles push period and ovulation estimates later. Shorter cycles bring those estimates earlier.
Irregular cycles, stress, illness, travel, medication, and hormonal factors can all change period timing.
This calculator is designed to help you understand the likely number before you make a decision or start an application.
Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.
Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.
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