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
What Is Mounjaro's Golden Dose Amount?
The "golden dose" of Mounjaro refers to the most effective dose range for weight management, typically between 10 mg and 15 mg weekly. However, the optimal dose varies between individuals based on tolerability, response, and health conditions. In the UK, Mounjaro prescribing follows a careful dose titration schedule starting at 2.5 mg, with increases every 4 weeks. Our free GLP-1 weight loss calculator can help you explore potential outcomes at different doses, though your prescriber will determine the right dose for you following a clinical assessment. Understanding how tirzepatide doses work is essential for setting realistic expectations about your weight management journey.
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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.
NHS Prescribing and UK Dose Titration
In the UK, Mounjaro is prescribed following NHS and MHRA guidelines, with a structured dose titration approach. The starting dose is 2.5 mg once weekly, with increases every 4 weeks if tolerated: 5 mg (weeks 5–8), 7.5 mg (weeks 9–12), 10 mg (weeks 13–16), 12.5 mg (weeks 17–20), and the maximum maintenance dose of 15 mg from week 21 onwards. Most patients reach their effective dose between 10–15 mg, though some respond well at lower doses. The term "golden dose" is informal — there is no single universally optimal dose. Clinical trials (SURMOUNT-1) showed that 10 mg and 15 mg produced significant average weight losses of approximately 19.5% and 20.9% respectively, but individual results vary considerably. Your GP or specialist prescriber will assess your tolerability and response at each stage, adjusting your Mounjaro UK prescription accordingly.
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 Eligibility and Private Prescribing Routes
In the UK, Mounjaro access differs significantly between NHS and private routes. NHS route: Referral to a tier 3 specialist weight management service is required; availability and waiting times vary by region (ICB). Private route: Available through GPhC-registered online prescribers following an online clinical assessment — no NHS referral needed. Both routes require clinical assessment to determine eligibility and the appropriate starting and target dose. The "golden dose" concept matters less than finding your personally effective dose. Use our free BMI calculator to assess your current health category, then discuss with your prescriber which dose escalation pathway may be right for you. Neither route offers a assured outcome — weight loss depends on the dose, individual response, diet, activity, and consistency.
- 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 does "golden dose" of Mounjaro mean in the UK?
The "golden dose" informally refers to the most commonly effective dose range (10–15 mg weekly), where most patients experience significant weight loss in clinical trials. However, individual response varies, and your prescriber will determine your personal optimal dose through careful titration starting from 2.5 mg.
How long does it take to reach the highest Mounjaro dose?
Reaching the maximum 15 mg dose takes approximately 20–21 weeks, as Mounjaro is titrated 4 weeks apart starting from 2.5 mg. Your prescriber may pause escalation or maintain a lower dose if you're experiencing side effects or have achieved your weight loss goals.
Is the "golden dose" the same for everyone?
No. The optimal dose varies between individuals based on tolerability, response, BMI, comorbidities, and other health factors. Some patients respond well at 10 mg, others at 15 mg, and some at lower doses. Your prescriber will individualise your dose.
Can I access the highest Mounjaro dose through the NHS in the UK?
Yes, if prescribed through an NHS tier 3 specialist service, you can escalate to 15 mg if clinically appropriate and well tolerated. NHS prescribing follows the same titration protocol as private prescribing, though availability and waiting times vary by region.
What if I don't respond to Mounjaro at the golden dose range?
If you don't achieve satisfactory weight loss at 10–15 mg, your prescriber may review diet and activity levels, check for underlying conditions, or discuss alternative approaches. Mounjaro isn't effective for everyone, and your GP can advise on next steps.
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.