Gestation Calculator

This calculator has been designed to give you an idea of the treatment options available to you*. If you decide to have an abortion with Marie Stopes UK, one of our nurses will give a more approximate gestation date during your appointment by way of a scan.
*Please note that this online calculator will only give you an estimated gestation based on the details you have provided.

Please select the first day of your last menstrual period.



We are here to support you 24 hours a day, 7 days a week

Call us now on 0345 300 8090 or email services@mariestopes.org.uk

0345 300 8090

Your Feedback

As the UK’s leading reproductive health charity Marie Stopes UK aims to provide the best possible service and care to all our clients. Any feedback is extremely appreciated and valued by our staff. 


Your opinion and suggestions are extremely important to us. If you have any feedback about your experience or treatment we would love to know. We will ensure your comments are directed to the appropriate team, and reviewed as part of our commitment to continually improving our services.

How to send us your comments

Email – services@mariestopes.org.uk

Telephone – 0345 300 80 90


We work very hard to ensure we provide women with the best care we can while they are with us for treatment. If you are happy with any part of the service you receive please let us know. We will record your views and pass them on to the people involved. 

How to send us your compliment

Email – services@mariestopes.org.uk

Telephone – 0345 300 80 90

Making a complaint

Should you wish to make a complaint about any aspect of the service or care you have received, there are a number of ways in which you can bring this to our attention:

1. By completing the client questionnaire given to every client before leaving our centres. 

2. By telephoning our call centre 0345 300 80 90 , advising you wish to make a complaint. You will then be transferred to the treatment centre, within working hours, to speak with the manager or a supervisor. A record will be made of your complaint and investigated by the manager or supervisor with the team members concerned. Depending on the nature of the complaint you may be asked to put this in writing, for ease of investigation. If your complaint cannot be resolved at the time of the initial telephone call you will be contacted either by telephone, or in writing, once the investigation has been completed.

3. By writing to us, please address this to Head of Quality and Customer Services at Marie Stopes International, 1 Conway Street, Fitzroy Square, London W1T 6LP. Your complaint will be handled by the Head of Customer and Quality Services, who will instigate an investigation with the Manager of the relevant treatment centre. A subsequent written response will be forwarded to you.

4. By e-mail to quality.customerservice@mariestopes.org.uk . In order to ensure privacy and confidentiality please follow any e-mail correspondence up in writing. 

5. By contacting your local CCG or NHS England (NHS complaint process). 


  • We will acknowledge any written complaint within two working days of receipt and any telephone enquiries within 24 hours
  • A full investigation will be carried out, with the relevant team member(s), of the circumstances surrounding the incident(s) 
  • Following the investigation, a full response will be made to you within a reasonable time, usually between three to four weeks. Should there be any delays in this process, you will be kept informed 


In order to maintain confidentiality we cannot enter into any discussion or correspondence with a third party, without your permission. If you wish for us to liaise with a third party please give us your consent in writing. 

Unresolved Complaints 

Should you be dissatisfied with the response received, you have recourse to appeal to the Chief Nurse, who will review all the case notes and correspondence and will, in turn, respond as soon as possible (stage 2 appeal). Generally, a stage 2 appeal must be made within 20 working days of the date of the final written response sent to you.  

Finally, if your complaint is not resolved to your satisfaction you can contact ISCAS, the Independent Sector Complaints Adjudication Service. Clients referred by the NHS may also follow the NHS complaint process or contact the Health Service Ombudsman. 

The addresses to contact are as follows:


Health Service Ombudsman

70 Fleet Street

Millbank Tower







Tel: 020 7536 6091 

Monday to Friday 9:00am-5:00pm

Tel: 0345 015 4033