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
Does Exercising Help With Weight Loss?
Yes, exercising absolutely helps with weight loss — but it works best when combined with dietary changes. Physical activity burns calories, builds muscle, and supports sustainable weight management. The NHS recommends combining regular exercise with a reduced-calorie diet for the best results. Most people lose weight through a combination of eating fewer calories and increasing physical activity. You can calculate your personal BMI and healthy weight range using our free BMI calculator above to understand your starting point, then create a realistic plan combining exercise with nutrition.
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.
How Exercise Supports Weight Loss
Exercise helps weight loss in several ways. Calorie burning: Physical activity burns calories during and after exercise, creating part of the energy deficit needed for weight loss. Muscle building: Strength training builds lean muscle, which increases your resting metabolic rate — meaning you burn more calories throughout the day. Appetite regulation: Regular exercise can help regulate hunger hormones and reduce cravings. Metabolic health: Activity improves insulin sensitivity and blood sugar control, particularly important if you're managing weight-related health conditions.
For effective weight loss in the UK, the NHS recommends at least 150 minutes of moderate-intensity aerobic activity per week, plus strength training twice weekly. However, exercise alone rarely produces significant weight loss without dietary changes. A calorie deficit of approximately 500 kcal per day — achieved through combining reduced food intake with exercise — typically results in losing around 0.5 kg per week, which is the NHS-recommended sustainable rate.
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.
Exercise, Diet, and Prescription Support
The most effective weight management approach combines exercise, dietary changes, and — for eligible individuals — prescription weight loss medication. If you have a BMI of 30 or above, or 27 or above with weight-related health conditions like type 2 diabetes or high blood pressure, your GP may refer you to specialist weight management services. Some people benefit from GLP-1 weight loss injections alongside exercise and diet, particularly when initial efforts plateau. Try our free GLP-1 weight loss calculator to understand how prescription medication might support your goals alongside your exercise routine. Remember that sustainable weight loss takes time — aim for 0.5 to 1 kg per week, and track your progress using our free progress tracker to stay motivated.
- 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.
How much exercise do I need for weight loss?
The NHS recommends at least 150 minutes of moderate-intensity aerobic exercise (like brisk walking or cycling) per week, plus strength training on two days. However, weight loss primarily requires a calorie deficit through diet — exercise should complement, not replace, eating fewer calories. Start with what's sustainable for you and gradually increase activity levels.
Can I lose weight through exercise alone without changing my diet?
It's very difficult to lose weight through exercise alone. You'd need to burn thousands of calories weekly, which is impractical for most people. Weight loss requires a calorie deficit, typically achieved by combining reduced food intake with increased activity. Diet changes are more important than exercise for actual weight loss, though exercise supports health and sustainability.
What type of exercise is best for weight loss?
Combining aerobic exercise (walking, running, swimming, cycling) with strength training is most effective. Aerobic activity burns calories during exercise; strength training builds muscle and increases resting metabolism. Mix both types weekly for best results. Choose activities you enjoy — consistency matters more than intensity.
How long does it take to see weight loss from exercise?
Visible weight loss typically takes 4 to 8 weeks of consistent exercise combined with dietary changes. Some people notice improvements in fitness, energy, and how clothes fit before scales change. Weight loss is gradual and individual — aim for 0.5 to 1 kg per week for sustainable results. Track your progress using metrics beyond just weight.
Does exercise help if I'm taking weight loss medication like Mounjaro or Wegovy?
Yes, absolutely. Prescription weight loss injections work best alongside exercise and dietary changes, not instead of them. Exercise improves cardiovascular health, builds muscle, and supports mental wellbeing during weight loss. GLP-1 medications like semaglutide (Wegovy) and tirzepatide (Mounjaro) are prescribed alongside lifestyle changes for maximum effectiveness.
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.