Qualifying Week Maternity Calculator
Use this calculator to estimate your qualifying week, expected week of childbirth, latest employment start date for Statutory Maternity Pay continuity, and whether your weekly earnings appear to meet the Lower Earnings Limit.
Enter your due date and details, then click Calculate qualifying week.
Eligibility timeline chart
Fast maternity timeline planning
This calculator is designed for UK users who want a practical estimate of the qualifying week for Statutory Maternity Pay, plus a quick first pass on employment continuity and earnings threshold checks.
- ✓Calculates the expected week of childbirth as a Sunday to Saturday week.
- ✓Finds the qualifying week, which is the 15th week before the expected week of childbirth.
- ✓Estimates the latest employment start date needed to satisfy 26 weeks of continuous employment by the end of the qualifying week.
- ✓Converts different pay frequencies into average weekly earnings for Lower Earnings Limit comparison.
- ✓Shows a simple visual chart of the statutory timeline.
Expert guide to using a qualifying week maternity calculator
A qualifying week maternity calculator helps you work out one of the most important dates in UK maternity pay planning. If you are employed and expecting a baby, your qualifying week is central to understanding whether you are likely to meet the service requirement for Statutory Maternity Pay, often called SMP. It also gives you a practical date range for checking earnings, speaking with payroll, and preparing evidence such as your MATB1 certificate.
In plain terms, the qualifying week is the 15th week before the expected week of childbirth. The expected week of childbirth is not just your due date. It is the full week, running Sunday to Saturday, in which your due date falls. Once you know that week, you count back 15 weeks to find the qualifying week. That is exactly the kind of timeline this page calculates for you.
Why the qualifying week matters
For many employees, SMP eligibility depends on two major tests. First, you usually need to have been continuously employed by the same employer for at least 26 weeks up to and including the qualifying week. Second, your average weekly earnings must normally be at or above the Lower Earnings Limit for National Insurance purposes during the relevant period used by payroll. A good calculator gives you an early planning estimate for both.
The practical importance is huge. If you know your qualifying week early, you can answer questions like these:
- Did I start work early enough to qualify for SMP with my current employer?
- What date should I compare my employment start date with?
- Are my earnings likely to meet the Lower Earnings Limit?
- When should I tell my employer and provide paperwork?
- If I miss SMP, should I investigate Maternity Allowance instead?
This is why a qualifying week maternity calculator is one of the most useful planning tools in pregnancy. It reduces uncertainty and helps you move from rough assumptions to clear dates and realistic next steps.
How the calculator works
1. It finds your expected week of childbirth
If your due date falls on any day in a given week, that whole Sunday to Saturday window becomes your expected week of childbirth. For example, if your due date is a Wednesday, the week starts on the previous Sunday and ends on the following Saturday.
2. It counts back 15 weeks
Your qualifying week is the week that starts 15 weeks before the expected week of childbirth. This is a fixed statutory concept and is widely used in payroll and maternity rights guidance.
3. It estimates the latest employment start date
The calculator also estimates the latest date you could have started with your employer and still complete 26 continuous weeks of employment by the end of the qualifying week. This gives a clear benchmark for the service test.
4. It converts pay into average weekly earnings
Because people are paid weekly, fortnightly, every four weeks, monthly, or annually, the calculator converts your amount into an approximate weekly figure. It then compares this result against the Lower Earnings Limit selected in the tool. This is a planning estimate only, because employers use a specific relevant period and payroll records.
Statutory maternity pay rates and earnings thresholds
Below is a quick comparison of recent published rates and thresholds commonly used in maternity pay planning. Always confirm the latest official position with HMRC or GOV.UK because annual rates can change.
| Tax year | Lower Earnings Limit | Standard SMP weekly rate | First 6 weeks of SMP |
|---|---|---|---|
| 2024 to 2025 | £123 | £184.03 | 90% of average weekly earnings |
| 2025 to 2026 | £125 | £187.18 | 90% of average weekly earnings |
These figures matter because they frame the two core SMP tests. If your average weekly earnings are below the Lower Earnings Limit, you may not qualify for SMP even if you pass the service test. On the other hand, if your earnings are above the threshold but your employment began too late, you may still miss SMP and need to explore Maternity Allowance instead.
Real timeline statistics every parent should know
Maternity planning is much easier when you understand the official time windows. These are not arbitrary dates. They are part of the legal and administrative structure of maternity rights in the UK.
| Milestone | Typical statutory timing | Why it matters |
|---|---|---|
| Qualifying week | 15th week before expected week of childbirth | Used for continuous employment test |
| Required service for SMP | 26 continuous weeks up to and including qualifying week | Checks continuity with the employer |
| Maternity leave can start | Usually from 11 weeks before the week baby is due | Important for planning leave and pay start date |
| SMP payment length | Up to 39 weeks | Key for budgeting and cash flow planning |
| Notice to employer | Usually by the end of the 15th week before the due week | Supports payroll setup and leave arrangements |
The statistics in this table are directly relevant because they determine the sequence in which most maternity admin happens. A qualifying week maternity calculator gives shape to that timeline immediately, often before you have even had a detailed payroll conversation.
Worked example
Imagine your expected due date is 20 November 2025. The calculator first identifies the Sunday to Saturday week containing that date. It then counts back 15 weeks to determine your qualifying week. Next, it estimates the latest date by which you would need to have started work in order to complete 26 continuous weeks by the end of that qualifying week.
Now imagine you earn £2,300 per month gross. The calculator converts monthly earnings into average weekly earnings by multiplying by 12 and dividing by 52. In this example, that produces about £530.77 per week, which is comfortably above both the £123 and £125 Lower Earnings Limits shown in the current comparison table. That does not guarantee SMP on its own, but it suggests the earnings test is likely to be met.
If your start date falls after the estimated latest start date, the service test may be the issue rather than earnings. That is a valuable insight because it tells you what to ask next. Instead of focusing only on your payslips, you may need to ask HR whether there are any special circumstances, contract continuity factors, or alternative support routes such as Maternity Allowance.
Common mistakes people make
- Using the due date itself as the qualifying week. The legal framework uses the week the baby is due, not just the single date.
- Forgetting that weeks run Sunday to Saturday. This can shift calculations by several days and change the apparent deadline.
- Confusing maternity leave with SMP eligibility. Leave rights and pay rights overlap, but they are not always identical in practice.
- Looking only at headline salary. Payroll uses average weekly earnings in a defined relevant period, not just your annual salary description.
- Ignoring alternative support. If SMP is not available, Maternity Allowance may still be worth exploring.
What to do after you calculate your qualifying week
Check your employment continuity
Compare your employment start date with the latest start date shown by the calculator. If you started before that date, you are more likely to pass the 26 week continuity test. If you started later, ask HR or payroll for a formal assessment rather than assuming you are ineligible.
Review your earnings
Use your gross pay, not your take home pay. If your earnings vary, rely on official payslips and ask payroll what relevant period they will use. The calculator gives a planning estimate, but payroll records determine the formal answer.
Prepare your paperwork
You will usually need to tell your employer you are pregnant, your expected week of childbirth, and when you want your maternity leave to start. The MATB1 certificate is commonly used for this process.
Budget with real numbers
Remember that SMP is usually paid at 90% of average weekly earnings for the first 6 weeks and then the standard weekly rate or 90% of average weekly earnings, whichever is lower, for the remaining weeks. This can feel very different from your normal monthly pay, so early budgeting matters.
Authoritative sources for official maternity rules
If you want to verify the legal framework and current rates, start with these trusted sources:
- GOV.UK: Maternity pay and leave
- GOV.UK: Statutory Maternity Pay
- Acas: Maternity leave, pay and rights
Although Acas is not a .gov domain, it is still a highly trusted UK employment rights source. For official rates and legal wording, GOV.UK remains the primary reference point. If you want health guidance related to due dates and pregnancy timeline planning, the NHS is also helpful.
Frequently asked questions
Does this calculator guarantee my SMP eligibility?
No. It provides a strong planning estimate based on your due date, employment start date, and earnings input. Your employer and payroll team make the formal decision using actual records and the correct relevant period.
What if I am below the Lower Earnings Limit?
You may not qualify for SMP, but you should look into Maternity Allowance. Many people who do not meet SMP rules still have another route to support.
What if I changed jobs during pregnancy?
That is exactly when a qualifying week maternity calculator becomes useful. The 26 week continuity requirement is employer specific, so a change of job can affect SMP eligibility even if your total work history is long.
What if my pay changes every month?
Use the calculator as a rough estimate, then check the precise payroll period used by your employer. Variable pay, bonuses, and irregular hours can make the official earnings calculation more nuanced.
Final takeaway
A qualifying week maternity calculator is one of the simplest ways to turn a due date into a meaningful legal and payroll timeline. Once you know your expected week of childbirth, your qualifying week, and the latest employment start date that supports 26 weeks of continuous service, you can have a much clearer conversation with your employer. Add an earnings estimate and you have a practical first check on likely SMP eligibility.
Important: This calculator is for planning and education. Always confirm final maternity pay and eligibility with your employer, payroll team, or official GOV.UK guidance.