The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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Weight Loss Gym Plan for Women — UK Guide
A successful weight loss gym plan for women combines regular exercise with dietary changes and, when appropriate, prescription support. In the UK, women have access to multiple weight management options through the NHS and private services, including prescription medications alongside structured gym routines. Our free BMI calculator helps you establish your starting point, whilst our GLP-1 weight loss calculator can show you what's possible with medical support. This guide covers UK-licensed prescription options, eligibility criteria, and how to create a sustainable approach to weight loss that works with your lifestyle.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
UK Prescription Weight Loss Options for Women
Several prescription medications are now available in the UK to support weight management alongside gym plans and exercise routines. These are licensed treatments, not supplements, and require clinical assessment before prescription.
- Mounjaro (tirzepatide) — A dual GIP and GLP-1 receptor agonist given as a once-weekly injection. Clinical trials showed average weight loss of 15–21% of body weight over 72 weeks when combined with lifestyle changes.
- Wegovy (semaglutide) — A GLP-1 receptor agonist, also injected once weekly. The STEP trial demonstrated approximately 15% average weight loss at the maximum dose (2.4 mg).
- Saxenda (liraglutide) — A daily GLP-1 injection taken once per day, with similar efficacy to Wegovy.
These prescription weight loss medications work by reducing appetite and food cravings, helping you stick to your gym plan and reduced-calorie diet. Results vary significantly between individuals — medication is most effective when combined with regular exercise and structured nutrition.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private Access and Eligibility
In the UK, women can access prescription weight loss medication through the NHS or private providers. NHS access is through specialist tier 3 weight management services, typically requiring a GP referral and meeting specific BMI criteria (BMI 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure). Waiting times vary significantly by region. Private access is available through UK-licensed online prescribers following a clinical assessment, without requiring NHS referral.
To find out if you're eligible, use our free BMI calculator to check your current BMI against NHS thresholds. If you have a BMI of 27 or above, speak to your GP about referral to specialist weight management services, or explore private prescribing options. Your GP can also assess whether medication is appropriate alongside your gym plan based on your overall health.
Combining prescription medication with a structured gym plan maximises weight loss potential. Medications reduce hunger and cravings, making it easier to maintain a calorie deficit during your training routine. Track your progress using our free progress tracker — logging both gym attendance and weight changes helps identify what's working. Remember that sustainable weight management is a combination: prescription support (if appropriate), consistent gym sessions, balanced nutrition, and lifestyle changes. Most women using these medications see best results when they commit to regular exercise and dietary changes alongside medical treatment.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Can I use prescription weight loss medication without going to the gym?
Prescription medications like Mounjaro and Wegovy are most effective when combined with exercise and dietary changes. Medication alone supports weight loss by reducing appetite, but adding regular gym activity improves cardiovascular health, builds muscle, and enhances overall results. Exercise also helps prevent muscle loss during weight reduction.
How much weight can women expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% body weight with Mounjaro and approximately 15% with Wegovy over 68–72 weeks. Individual results vary significantly based on your starting weight, gym consistency, diet adherence, and personal metabolism. Your actual weight loss may be more or less than the trial average.
What's the difference between Mounjaro and Wegovy for women?
Both are once-weekly injections. Mounjaro is a dual GIP and GLP-1 agonist, whilst Wegovy is a GLP-1-only medication. Some studies suggest Mounjaro may produce slightly greater average weight loss, but differences between individuals are larger than differences between medications. Your prescriber will recommend the most suitable option based on your health profile.
How do I get prescription weight loss medication on the NHS?
Ask your GP for a referral to your local specialist tier 3 weight management service. Eligibility requires a BMI of 30 or above (or 27–29.9 with weight-related health conditions). NHS availability and waiting times vary by region. Private prescribing offers faster access without NHS referral, following an online clinical assessment.
Can I take weight loss medication whilst pregnant or breastfeeding?
No. Prescription weight loss medications are not recommended during pregnancy or whilst breastfeeding. If you're planning to become pregnant or are already pregnant, discuss alternative weight management strategies with your GP. These medications can be restarted after breastfeeding ends if appropriate.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.