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
10kg Weight Loss Before and After: UK Medication Options
Losing 10kg is a realistic, meaningful goal that can significantly improve your health. In the UK, you have several evidence-based options available, including prescription weight management medications alongside lifestyle changes. This guide explains what a 10kg weight loss means for your body, which medications may help, and how to find out if you're eligible through the NHS or private routes. Individual results vary, but clinical evidence shows that structured support and the right tools can make a real difference.
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.
UK-Licensed Weight Loss Medications
Three prescription-only medications are currently licensed in the UK for weight management: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). All work by activating natural hormone pathways that help regulate appetite and promote feeling fuller after smaller meals. Clinical trials show that adults using these medications alongside reduced-calorie diets and increased physical activity may lose 10–15% of their body weight on average—which for someone starting at 100kg would be around 10–15kg. However, individual results vary significantly and depend on the dose, adherence, and lifestyle changes. Both Mounjaro and Wegovy are once-weekly injections, making them convenient for busy schedules. Eligibility depends on your BMI and any weight-related health conditions. You can use our free GLP-1 weight loss calculator to explore potential results at different doses, and our BMI calculator to check where you currently stand.
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 in the UK
NHS access: Weight loss medications are available through tier 3 specialist weight management services, but you'll need a GP referral and acceptance into the service. Waiting times vary significantly by region—some areas have waits of many months. Private access: Available through online consultations with UK-licensed prescribers and GPhC-registered pharmacies, typically without a waiting list, though you'll pay for treatment. A prescriber will assess your eligibility based on your BMI, health history, and weight-related conditions. To find out if you qualify, speak to your GP about referral to specialist services, or contact a private prescriber for an online assessment. Either route requires a clinical consultation—medications are never available without assessment.
- 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 losing 10kg actually mean for my health?
For most adults, losing 10kg can significantly improve health markers. It reduces strain on joints, lowers blood pressure and cholesterol, improves blood sugar control, and reduces the risk of type 2 diabetes and heart disease. Even a 5–clinically studied weight loss produces measurable benefits. Your GP can discuss what losing 10kg would mean for your specific health profile.
How long does it take to lose 10kg with weight loss medication?
On average, clinical trials show that people lose 10–15% of body weight over 16–20 weeks when taking Mounjaro or Wegovy alongside lifestyle changes. For a 100kg person, this might be 10–15kg. However, timescales vary—some people lose weight more quickly, others more slowly. Consistency with the medication, diet, and exercise matters most.
Can I get weight loss injections on the NHS in my area?
NHS access depends on your regional ICB (Integrated Care Board) and specialist service availability. Some areas have limited capacity. Your first step is to ask your GP for a referral to tier 3 weight management services. If NHS waiting times are long in your area, private options are also available through online prescribers.
What's the difference between Mounjaro and Wegovy for a 10kg weight loss goal?
Both are effective for weight management. Mounjaro is a dual GIP and GLP-1 agonist; Wegovy is a GLP-1 agonist only. Clinical data shows Mounjaro may produce slightly larger average weight losses (around 15–21% body weight vs 15% for Wegovy), but individual results vary. A prescriber can discuss which suits your circumstances best.
Do I need to diet and exercise as well as taking medication?
Yes. Weight loss medications work best alongside a reduced-calorie diet and increased physical activity. These medicines support appetite control and feeling fuller, but they're not standalone solutions. Most clinical trials that showed 10kg+ weight loss combined medication with structured dietary and lifestyle changes. Your prescriber will discuss creating a plan that works for you.
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.