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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How Much Is 7.5mg Mounjaro in Ml?
Mounjaro comes in a pre-filled KwikPen device, and the 7.5mg dose is one of the standard maintenance doses used in the tirzepatide weight management programme. The injection is delivered as a fixed volume in the pen, not measured by millilitres — each KwikPen contains a specific amount of medication regardless of dose strength. If you've been prescribed 7.5mg Mounjaro, your GP or prescriber will provide clear instructions on injection technique. Use our free GLP-1 weight loss calculator to understand how different Mounjaro doses may support your weight management goals.
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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.
Understanding Mounjaro Dosing and Delivery
Mounjaro is prescription-only and delivered via a pre-filled KwikPen injection device. Unlike liquid medications measured in millilitres, Mounjaro doses are measured in milligrams (mg) of tirzepatide. The 7.5mg dose is typically reached after several weeks of dose titration — starting at 2.5mg and gradually increasing every four weeks to allow your body to adjust.
- 2.5mg: Weeks 1–4 (starting dose)
- 5mg: Weeks 5–8 (first maintenance)
- 7.5mg: Weeks 9–12 (escalation dose)
- 10–15mg: Higher maintenance doses if needed
Each KwikPen contains four pre-filled doses — a four-week supply. Your prescriber will assess your individual response before recommending escalation to 7.5mg or higher.
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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.
7.5mg Mounjaro: Eligibility and Next Steps
Reaching the 7.5mg dose through tirzepatide dosing typically indicates you're progressing through a structured weight management programme. To be eligible for Mounjaro in the UK, you need a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Check your personal BMI using our free BMI calculator above to understand where you sit on the NHS scale.
At 7.5mg, you may start to experience the full effects of the dual GIP and GLP-1 mechanism on appetite regulation. Your prescriber will monitor your weight loss progress, side effects, and overall health response. If you experience persistent side effects or have concerns about your dose, always discuss with your GP or the prescriber managing your medication.
- 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.
Is 7.5mg Mounjaro a standard dose?
Yes, 7.5mg is one of the escalation doses in the standard tirzepatide dosing schedule. You typically reach it by week 9 if you start at 2.5mg and increase every four weeks. Some people maintain at 7.5mg, while others escalate further to 10mg, 12.5mg, or the maximum 15mg dose, depending on individual response and prescriber guidance.
Why doesn't Mounjaro measure dose in millilitres?
Mounjaro is measured in milligrams (mg) of the active ingredient tirzepatide, not millilitres (ml). The KwikPen is a pre-filled device that delivers a fixed dose regardless of volume. This standardises dosing and makes administration simpler — you don't need to measure or calculate anything.
What weight loss might I expect at 7.5mg Mounjaro?
Clinical trials showed an average weight loss of approximately 15–20% of body weight on tirzepatide doses of 7.5mg and above, though individual results vary significantly. Weight loss depends on your starting weight, diet, physical activity, and how your body responds. Your prescriber can discuss realistic expectations based on your circumstances.
Can I get 7.5mg Mounjaro on the NHS in the UK?
Mounjaro is available through NHS specialist weight management services (tier 3), but availability varies by region. Many NHS areas have limited supply or long waiting lists. Private prescribing through UK-licensed online clinics is also an option. Always check with your GP about NHS access in your area.
What are the main side effects at 7.5mg Mounjaro?
The most common side effects at 7.5mg include nausea, diarrhoea, vomiting, and constipation — many people find these reduce as their body adjusts. Less common side effects include indigestion, fatigue, dizziness, and injection site reactions. Serious side effects are rare but include severe stomach pain (possible pancreatitis) — seek immediate medical attention if this occurs.
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.