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
Free tracker included with every download this week
Understanding Wegovy Doses: 5.10 vs 5.3
Wegovy (semaglutide) doses are measured in milligrams, and the specific dosing schedule is carefully designed to help your body adjust gradually to the medication. While Wegovy's standard dose progression includes 0.25mg, 0.5mg, 1mg, 1.7mg, and a maximum of 2.4mg weekly, you may have heard references to intermediate doses during your weight loss journey. This NHS-aligned guide explains how Wegovy dosing works in the UK and what each adjustment means for your weight management plan. Use our free BMI calculator to track where you stand, and our GLP-1 weight loss calculator can help estimate potential outcomes at different doses.
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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.
How Wegovy Dosing Works in the UK
Wegovy is a prescription-only GLP-1 receptor agonist licensed for weight management in UK adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions. The medication requires a clinical assessment before prescription and is administered as a once-weekly injection.
The standard Wegovy dose progression follows this schedule:
- Weeks 1–4: 0.25mg — starting dose to assess tolerance
- Weeks 5–8: 0.5mg — first escalation
- Weeks 9–12: 1mg — second escalation
- Weeks 13–16: 1.7mg — third escalation
- Week 17+: 2.4mg — maximum maintenance dose
Each dose increase is spaced at least 4 weeks apart to allow your body to adjust. In clinical trials (STEP-1), participants on 2.4mg semaglutide lost an average of approximately 14.9% of their body weight over 68 weeks alongside a reduced-calorie diet and increased physical activity. Individual results vary significantly.
Clinically BackedWeight Loss
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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.
What About Intermediate or Specific Dose References?
If you've encountered references to specific dose numbers like "5.10" or "5.3," these may relate to clinical trial coding, pharmacy batch references, or informal dose descriptions used in online forums—but they do not correspond to standard Wegovy dosing in UK practice.
Your prescriber will always use the standard mg-based dosing schedule outlined above. If you're uncertain about your current dose or the next escalation, contact your prescriber or the pharmacy dispensing your medication. Never adjust your dose without clinical guidance. Use our free weight converter and BMI calculator to track your health metrics alongside your treatment, and consider our progress tracker to log your weight loss journey and share results with your healthcare team.
- 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.
What is the maximum dose of Wegovy available in the UK?
The maximum licensed dose of Wegovy in the UK is 2.4mg once weekly. This is reached after a gradual escalation from 0.25mg over approximately 16 weeks. Your prescriber will assess whether this dose is right for you based on your individual response and health needs.
How long does each Wegovy dose stage last?
Each dose stage lasts a minimum of 4 weeks before escalation. This allows your body to adjust and helps your prescriber monitor how well you're tolerating the medication. You may remain on the same dose longer if needed, or escalate every 4 weeks as planned.
Can I skip a dose escalation if I'm seeing results?
Dose changes should only be managed by your prescriber. If you're achieving good results on a lower dose, discuss this with your prescriber—they may recommend staying at that dose. Never stop or change your dose without medical guidance.
Is Wegovy the same as Ozempic?
Both Wegovy and Ozempic contain semaglutide, but they are different products. Ozempic is licensed for type 2 diabetes (doses up to 2mg) and is not approved for weight loss in the UK. Wegovy is specifically licensed for weight management (up to 2.4mg) and is the correct choice for weight loss treatment.
How do I know if I'm on the right dose?
Your prescriber will assess your response at each 4-week mark, considering your weight loss progress, how well you're tolerating side effects, and your overall health. If you have concerns about your current dose, discuss them with your prescriber at your next review.
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.