This contraception eligibility calculator uses the UK Medical Eligibility Criteria (UKMEC) to help assess which contraceptive methods may be suitable based on individual characteristics and medical conditions. The calculator compares six main contraceptive methods and provides UKMEC categories for both initiating and continuing each method.
⚠️ Important Medical Disclaimer
This calculator is for educational purposes only. It is not medical advice and is not a medical device. The information provided should not replace consultation with a qualified healthcare professional. UKMEC guidance is based on FSRH UK Medical Eligibility Criteria for Contraceptive Use (2016 + amendments) and may change over time. Always seek professional medical advice before making contraceptive decisions.
Version 1.0.0 – Last updated: December 2025
How to Use the UKMEC Calculator
- Complete the assessment: Work through each section and select all relevant medical conditions and characteristics.
- Calculate BMI: Enter height and weight to automatically calculate your BMI category.
- Review results: The calculator shows UKMEC categories for each contraceptive method in real-time.
- Filter options: Use the filter buttons to highlight the safest methods or show only Category 1-2 options.
- Share or save: Copy, print, or share your results using the buttons provided.
Note: Always discuss your results with a healthcare professional who can provide personalised advice.
UKMEC Categories Explained
Method can be used with no restriction. The benefits of using the method outweigh any theoretical or proven risks.
The advantages of using the method generally outweigh the theoretical or proven risks. The method can normally be used.
The theoretical or proven risks usually outweigh the advantages. Use of the method requires expert clinical judgement and careful monitoring.
The method represents an unacceptable health risk and should not be used.
Initiation vs Continuation: The UKMEC categories may differ for starting a new method (initiation) compared to continuing an existing method (continuation) if a condition develops while using it.
BMI Calculator
Results
⚠️ Educational purposes only. Not medical advice. Consult a healthcare professional.
Filter Options
| Contraceptive Method | Initiation | Continuation |
|---|---|---|
| Complete the assessment to see results | ||
Contraceptive Methods Compared
Cu-IUD
Copper Intrauterine Device
A small T-shaped device inserted into the uterus. Non-hormonal, highly effective, and can last up to 10 years.
LNG-IUS
Levonorgestrel Intrauterine System
A small T-shaped device that releases progestogen. Highly effective and can last 3-5 years depending on type.
Implant
Progestogen-only Implant
A small rod inserted under the skin of the upper arm. Releases progestogen and lasts up to 3 years.
DMPA
Depot Medroxyprogesterone Acetate
An injectable progestogen contraceptive given every 12-13 weeks.
POP
Progestogen-only Pill
A daily oral pill containing only progestogen. Must be taken at the same time each day.
CHC
Combined Hormonal Contraception
Contains both oestrogen and progestogen. Available as pill, patch, or vaginal ring.
Frequently Asked Questions (FAQs)
What is the UKMEC calculator used for?
The UKMEC calculator is a contraception eligibility tool that helps assess which contraceptive methods may be suitable based on individual medical conditions and characteristics. It uses the UK Medical Eligibility Criteria developed by the Faculty of Sexual and Reproductive Healthcare (FSRH) to categorise the safety of different contraceptive methods.
Who should use the UK Medical Eligibility Criteria for contraceptive decisions?
The UKMEC contraception checker is designed for UK healthcare professionals including GPs, nurses, and clinicians working in family planning. Informed patients can also use this educational tool to understand contraceptive eligibility criteria, but should always discuss results with a qualified healthcare professional before making contraceptive decisions.
What do UKMEC categories 1, 2, 3, and 4 mean?
The UKMEC contraceptive risk categories are: Category 1 – no restriction (method can be used); Category 2 – advantages generally outweigh risks; Category 3 – risks usually outweigh advantages (requires expert clinical judgement); Category 4 – unacceptable health risk (method should not be used). These categories help clinicians assess contraceptive safety for individuals with specific medical conditions.
Can I use the UKMEC calculator instead of seeing a doctor?
No. This UKMEC calculator is for educational purposes only and does not replace professional medical advice. While it provides guidance based on FSRH UKMEC criteria, only a qualified healthcare professional can provide personalised contraceptive advice considering your full medical history, preferences, and individual circumstances.
What is the difference between initiation and continuation in UKMEC?
In the UK Medical Eligibility Criteria, initiation refers to starting a new contraceptive method, while continuation applies when a medical condition develops whilst already using a method. UKMEC categories may differ between initiation and continuation – for example, a condition developing during use might warrant continuation under medical supervision even if it would be Category 3 or 4 for initiation.
How accurate is this UKMEC calculator?
This contraceptive eligibility calculator is based on the FSRH UK Medical Eligibility Criteria for Contraceptive Use (2016 with amendments). While it reflects published UKMEC guidance, it is a simplified educational tool. Clinical decisions should always be made by healthcare professionals who can consider the full clinical picture, individual circumstances, and the most up-to-date guidance.
Does the UKMEC guidance apply outside the UK?
UKMEC is specifically designed for UK practice and is based on FSRH guidance. Other countries have similar frameworks – the WHO provides Medical Eligibility Criteria (WHO MEC) used internationally. While there is significant overlap, always use criteria appropriate for your country and healthcare system.
What does UKMEC Category 3 mean for combined hormonal contraception?
UKMEC Category 3 means the theoretical or proven risks of using combined hormonal contraception usually outweigh the advantages for that individual. Use requires expert clinical judgement, careful counselling, and close monitoring. Alternative methods should be discussed. Common Category 3 conditions for CHC include migraine without aura in women over 35, controlled hypertension, and BMI over 35.
What are UKMEC Category 4 contraindications for the combined pill?
UKMEC Category 4 represents unacceptable health risk – the method should not be used. Category 4 contraindications for combined hormonal contraception include: migraine with aura, current or history of VTE, smoking aged 35 or over, blood pressure ≥160/≥100 mmHg, current breast cancer, ischaemic heart disease, stroke, and complicated valvular heart disease. Always consult updated FSRH guidance.
Is the copper IUD safe for women with heavy periods?
The copper IUD (Cu-IUD) can increase menstrual bleeding and cramping in some women, so it may not be the best choice for those already experiencing heavy periods. According to IUD medical eligibility criteria, heavy menstrual bleeding is generally UKMEC Category 2 for Cu-IUD initiation. The LNG-IUS is often a better option for heavy periods as it can reduce menstrual flow.
Can I use the progestogen-only pill if I have migraines?
Progestogen-only pill eligibility for women with migraines depends on the type. According to UKMEC, migraine without aura is Category 2 (advantages outweigh risks) for POP use. Migraine with aura is also Category 2 for POP, unlike combined hormonal contraception where it is Category 4. However, individual assessment by a healthcare professional is essential.
What contraception is safe for women with diabetes?
Diabetes and contraception eligibility varies by type and complications. For uncomplicated diabetes, most methods including the implant, IUD, LNG-IUS, POP, and DMPA are UKMEC Category 2. Combined hormonal contraception is Category 2 for uncomplicated diabetes but Category 3-4 if diabetes has vascular complications or duration over 20 years. Intrauterine contraception and implants are often recommended as first-line options.
Is the contraceptive implant suitable during breastfeeding?
Yes, the contraceptive implant is generally suitable for breastfeeding women. According to UKMEC and contraception in breastfeeding women guidance, the implant is Category 2 for women who are less than 6 weeks postpartum and breastfeeding, and Category 1 after 6 weeks. Progestogen-only methods like the implant do not affect milk production.
What contraception can I use immediately after giving birth?
Postpartum contraception eligibility depends on the method and timing. The Cu-IUD and LNG-IUS can be inserted immediately postpartum or from 4 weeks onwards. The progestogen-only pill and implant can be started from 3 weeks postpartum (Category 2 if breastfeeding before 6 weeks). Combined hormonal contraception should generally be avoided before 6 weeks postpartum, especially if breastfeeding (Category 4). DMPA can be used from 6 weeks postpartum.
Can smokers use combined hormonal contraception?
Smoking and contraception eligibility depends on age and amount smoked. According to UKMEC, women under 35 who smoke can generally use combined hormonal contraception (Category 2-3 depending on amount). Women aged 35 or over who smoke are Category 4 for CHC (unacceptable risk) due to increased cardiovascular risk. Alternative methods like the progestogen-only pill, implant, IUD, or LNG-IUS are recommended for smokers.
What contraception is recommended for women with obesity?
Obesity and contraception recommendations vary by BMI and method. For women with BMI 30-34, combined hormonal contraception is Category 3 (risks usually outweigh advantages). For BMI ≥35, CHC is Category 3-4. The Cu-IUD, LNG-IUS, and implant remain Category 1 regardless of BMI, making intrauterine contraception highly suitable. DMPA and POP are generally Category 2. Weight does not reduce contraceptive effectiveness of IUDs and implants.
Does liver disease affect which contraception I can use?
Yes, liver disease and hormonal contraception compatibility is important. Active viral hepatitis, decompensated cirrhosis, and liver tumours are Category 4 for combined hormonal contraception and Category 3 for progestogen-only methods. Compensated cirrhosis is Category 3 for CHC. The copper IUD (Cu-IUD) is generally Category 1 for all liver conditions as it is non-hormonal, making it the preferred option.
How often is the FSRH UKMEC guidance updated?
The FSRH UKMEC guidance is reviewed and updated periodically to reflect new evidence. The main UK Medical Eligibility Criteria for Contraceptive Use was published in 2016, with amendments and updates issued as needed. Healthcare professionals should regularly check the FSRH website for the latest guidance. This calculator is based on the 2016 guidance with subsequent amendments.