Planning for maternity leave can feel overwhelming—especially when you’re trying to understand how much income you’ll receive. Many NHS employees struggle to estimate their maternity pay due to varying rules like Occupational Maternity Pay (OMP) and Statutory Maternity Pay (SMP).
The NHS Maternity Pay Calculator helps simplify this. It gives you a clear breakdown of your expected pay during maternity leave based on your salary, service length, and leave plans.
On this page, you’ll learn:
- How NHS maternity pay is calculated
- How to use the calculator step-by-step
- What your results mean
- Practical tips to maximise your income
2025/26 Rates Applied
NHS Maternity Pay Calculator
Accurate OMP & SMP estimates for Agenda for Change staff — updated for April 2025 rates
Step 1
Your Employment Details
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This calculator provides estimates based on NHS Agenda for Change terms and 2025/26 SMP rates. Results are for guidance only — always confirm with your NHS Trust's payroll department.
What is the NHS Maternity Pay Calculator?
The NHS Maternity Pay Calculator is a digital financial tool specifically built for employees working under the NHS Agenda for Change (AfC) terms and conditions. It calculates the complex intersection of government-mandated statutory pay and the enhanced occupational benefits provided by the NHS.
Expectant parents, HR managers, and financial planners use this tool to create realistic household budgets for the 39 to 52 weeks of maternity leave. This tool is highly reliable because it utilizes the latest 2025/26 NHS pay scales and statutory rates, ensuring your estimates reflect current UK employment law and NHS policy.
How Does the NHS Maternity Pay Calculator Work?
The calculator uses the standard NHS Occupational Maternity Pay (OMP) formula, which is significantly more generous than the standard UK legal minimum. The logic is based on your “Average Weekly Earnings” (AWE) during a specific “calculation window” (usually weeks 17 to 25 of your pregnancy).
The Core Formula
The pay is typically split into three distinct phases:
- Phase 1 (8 Weeks): Full Pay (OMP inclusive of SMP).
- Phase 2 (18 Weeks): Half Pay plus SMP (capped at your full salary).
- Phase 3 (13 Weeks): SMP only (a flat government rate).
Worked Numerical Example
If your average weekly salary is £600:
- Weeks 1–8: You receive £600/week.
- Weeks 9–26: You receive £300 (Half Pay) + £184.03 (Current SMP rate) = £484.03/week.
- Weeks 27–39: You receive £184.03/week (SMP only).
Key Variables Table
Variable | Meaning | Impact on Calculation |
Gross Salary | Your annual pay before tax/pension. | Sets the baseline for “Full Pay” weeks. |
Continuous Service | Years/Months worked in the NHS. | Determines if you get OMP (12m+) or just SMP. |
Average Weekly Earnings | Pay received in the 8 weeks before the 15th week of the due date. | Defines the exact value of your “Full Pay.” |
Intended Leave Date | The day you stop working. | Shifts the timeline of your pay phases. |
How to Use This Calculator (Step-by-Step Guide)
Using the interface is straightforward. Follow these steps to get your results:
- Employment Details: Enter your Annual Gross Salary and select your NHS Continuous Service duration from the dropdown (e.g., “12 months or more”).
- Dates: Use the calendar pickers to select your Expected Due Date and your Intended Leave Start Date.
- Contract Info: Select your Contract Type (Full-time/Part-time) and confirm if you plan to return to the NHS (this is a requirement for OMP).
- Duration: Choose your Planned Leave Duration (e.g., 39 weeks or 52 weeks).
- Calculate: Click the blue “Calculate My Maternity Pay” button to generate your report.
NHS Maternity Pay Calculator Results Explained
Once you click calculate, the tool provides a high-level summary followed by a detailed “Pay Phase Breakdown.”
Result Category | What it Means | Recommended Action |
Total Pay | The total gross amount you will receive over the leave period. | Use this for long-term savings planning. |
Average Weekly Income | Your “smoothed” weekly income across the leave. | Set your monthly standing orders based on this. |
Full Pay Phase | The period where your income remains normal. | Maximize your savings during these first 8 weeks. |
Unpaid Phase | The period between weeks 40 and 52. | Ensure you have an “emergency fund” if taking the full year. |
A “good” result typically shows eligibility for “Full NHS Maternity Pay (OMP),” which occurs if you have 12 months of continuous service by the 11th week before your due date. If the tool only shows SMP, you may want to verify your service history with HR.
Practical Tips & Expert Advice
- Check Your Calculation Window: NHS payroll calculates your average pay based on the two months before your 15th week before the due date. If you can, avoid taking unpaid leave or reduced hours during this specific window.
- Pension Contributions: Remember that pension deductions continue during paid maternity leave. If you enter an unpaid period (weeks 40–52), you may have a “pension gap” to repay upon your return.
- Keep Your “KIT” Days: You are entitled to 10 Keeping in Touch (KIT) days. These are paid at your full daily rate without ending your maternity leave.
- Salary Sacrifice Schemes: If you have a car lease or childcare vouchers via salary sacrifice, check how these affect your “Average Weekly Earnings,” as they can lower your maternity pay.
- Professional Advice: Consult a qualified financial advisor if you are moving between NHS Trusts, as “Continuous Service” can sometimes be interrupted if not handled correctly.
Common Mistakes to Avoid
- Miscalculating Service Dates: Users often count only their current role. For OMP, Continuous Service usually includes time spent at any NHS employer, provided there wasn’t a break of more than a week.
- Ignoring the “Return to Work” Clause: To keep the OMP (the extra 18 weeks of half pay), you must return to the NHS for at least 3 months. If you don’t return, the NHS can claim the OMP portion back.
- Forgetting Unsocial Hours: If your role involves nights or weekends, ensure your “Average Weekly Earnings” include your average enhancements, not just your basic band pay.
Frequently Asked Questions
Yes. The calculator uses your gross annual salary or average weekly earnings. If you work part-time, enter your pro-rata salary, and the tool will calculate your entitlements based on that figure.
If you have worked for the NHS for less than 12 months but more than 26 weeks, you may not qualify for OMP but will likely still be eligible for Statutory Maternity Pay (SMP).
Our tool is updated with the latest Agenda for Change pay rates. However, always check your specific pay slip as local trust variations or pending national pay awards may apply.
Yes, you have a legal right to 52 weeks of leave. However, the NHS Maternity Pay Calculator will show that the final 13 weeks (weeks 40–52) are typically unpaid unless you use accrued annual leave.
Planning for maternity leave is a significant financial milestone. Using the NHS Maternity Pay Calculator empowers you to understand your entitlements under the Agenda for Change contract and the Statutory Maternity Pay framework. By knowing exactly when your “Full Pay” ends and your “Half Pay” begins, you can enjoy your pregnancy with the peace of mind that your finances are under control.
Ready to plan your future? Use the calculator above and bookmark this page for your next budget review!
Last Update: April 2026