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 BMI 25 and Can You Get Mounjaro?
A BMI of 25 places you in the overweight category according to NHS guidelines, sitting just above the healthy weight range of 18.5 to 24.9. Whether you may be eligible for Mounjaro (tirzepatide) depends on additional health factors beyond BMI alone. This guide explains what a BMI of 25 means, how it's calculated, and what weight management options might be available to you in the UK. Use our free BMI calculator above to check your personal BMI and see how it compares to NHS thresholds.
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.
BMI 25: What the NHS Says and Mounjaro Eligibility
A BMI of 25 is classified as overweight by the NHS, which defines healthy weight as BMI 18.5–24.9. At BMI 25, you're only marginally above the healthy threshold, but the NHS considers this a signal to monitor your weight and health more closely.
For Mounjaro eligibility, BMI alone is not the deciding factor. The NHS and private prescribers assess weight management medication eligibility based on:
- BMI 30 or above (obese), OR
- BMI 27–29.9 with at least one weight-related health condition such as type 2 diabetes, prediabetes, high blood pressure, or sleep apnoea
At a BMI of 25, you would not typically qualify for prescription weight management medication like Mounjaro on BMI criteria alone. However, if you have an underlying health condition linked to excess weight, your GP or a licensed prescriber can assess your individual situation. Our free GLP-1 weight loss calculator can help you understand how Mounjaro might project weight loss if you become eligible in future.
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.
BMI Limitations and What Else Matters
BMI is a useful screening tool but it does not distinguish between muscle and fat. If you're athletic or have significant muscle mass, your BMI may overestimate health risk. Other measurements matter equally:
- Waist circumference: Men over 94cm and women over 80cm face increased health risk, regardless of BMI
- Overall fitness: Regular physical activity reduces disease risk even at higher BMI
- Blood pressure and cholesterol: These are stronger predictors of heart disease than BMI alone
At BMI 25, the best approach is prevention—maintaining or reducing weight through sustainable dietary changes and regular activity. Your GP can assess your individual health risk and discuss weight management options using our weight converter to track progress in kg, stone, or lbs.
- 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 BMI 25 considered overweight in the UK?
Yes, according to NHS guidelines. A BMI of 25 falls in the overweight category (25.0–29.9). The healthy weight range is BMI 18.5–24.9. At BMI 25, you're only 0.1 points above healthy, so modest weight loss could bring you into the healthy range.
Can I get Mounjaro if my BMI is 25?
Unlikely, based on BMI alone. Mounjaro is typically prescribed to adults with BMI 30+ or BMI 27–29.9 with weight-related health conditions. At BMI 25, you would not meet standard eligibility criteria. Speak to your GP if you have health concerns.
How is BMI 25 calculated?
BMI is calculated as weight (kg) divided by height (metres squared). For example, if you weigh 70kg and are 1.68m tall, your BMI is 70 ÷ (1.68 × 1.68) = 24.8. Use our BMI calculator to find your exact BMI instantly.
What is the NHS healthy weight range at BMI 25?
To move from BMI 25 into the healthy range (BMI 18.5–24.9), you would need to lose around 2–5kg, depending on your height. The exact target weight varies by individual. Your GP can advise on a safe and sustainable rate of loss.
Are there other options if Mounjaro is not suitable?
Yes. At BMI 25, lifestyle changes—reduced-calorie diet, regular physical activity, and behaviour support—are the first-line approach. NHS Tier 1 services offer free digital tools and community programmes. Your GP can refer you to tier 2 services if needed.
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.