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
Mounjaro Click Chart — Dose Titration Explained
A Mounjaro click chart helps you understand how many clicks each dose represents on your KwikPen device. Mounjaro (tirzepatide) is a prescription-only, once-weekly injection licensed in the UK for weight management. This guide explains the standard dose titration schedule, how the KwikPen works, and what to expect at each dose level. Understanding your injection device is important for safe and effective use.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Mounjaro Doses and the KwikPen Click System
Mounjaro comes as a pre-filled KwikPen injection device. Each click on the pen delivers a specific dose of tirzepatide. The standard dose titration schedule starts at 2.5 mg and escalates every 4 weeks:
- Weeks 1–4: 2.5 mg (starting dose)
- Weeks 5–8: 5 mg (escalation)
- Weeks 9–12: 7.5 mg (escalation)
- Weeks 13–16: 10 mg (escalation)
- Weeks 17–20: 12.5 mg (escalation)
- Weeks 21+: 15 mg (maximum dose)
Your prescriber may adjust your titration schedule based on how you tolerate each dose. Do not skip doses or increase faster than recommended. Each pen contains 4 doses (4 weeks supply) and requires refrigeration until use.
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.
How to Use the Mounjaro KwikPen Correctly
The KwikPen is designed for easy self-injection. Always check the dose setting before injecting — the dial on the pen shows which dose you are about to inject. Hold the pen with the needle pointing downward and turn the dose selector until it stops at your prescribed dose. Inject into your stomach (abdomen), upper thigh, or upper arm, rotating sites weekly. After injection, hold the needle under your skin for 6 seconds to ensure the full dose is delivered. Dispose of used pens safely in a sharps bin or take to a pharmacy for safe disposal.
- 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 starting dose of Mounjaro in the UK?
The starting dose is 2.5 mg, taken once weekly for the first 4 weeks. This is the standard induction dose for all patients. After 4 weeks, your prescriber will review how you've tolerated it and may escalate to 5 mg for weeks 5–8.
How many clicks per dose on a Mounjaro KwikPen?
Mounjaro pens use a click dial system rather than numbered "clicks". The dial displays your chosen dose in mg (2.5, 5, 7.5, 10, 12.5, or 15). Always set the dial to your prescribed dose before injecting and check the window on the pen to confirm.
Can I download a Mounjaro click chart PDF?
Your prescriber or pharmacist will provide detailed instructions with your pen. The official patient information leaflet (PIL) and injection guides are available from your healthcare provider. Always follow your individual prescriber's guidance rather than generic charts, as dosing is personalised.
How quickly do I escalate through Mounjaro doses?
You remain on each dose for exactly 4 weeks before escalation. Faster escalation increases the risk of side effects like nausea. Your prescriber may slow the schedule if you experience significant side effects. Do not rush dose escalation.
Is Mounjaro the same as Wegovy for UK weight loss?
No. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist. Wegovy (semaglutide) is a single GLP-1 agonist. Both are prescription-only weight management injections in the UK, but they use different mechanisms and dose schedules. Your prescriber will determine which is more suitable.
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.