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 Weight Loss Decrease Blood Pressure?
Yes, weight loss can significantly decrease blood pressure in many people. The NHS confirms that losing even 5–10% of your body weight can help reduce high blood pressure and lower your risk of related health problems. This is one of the most effective lifestyle changes you can make for cardiovascular health. The relationship between weight and blood pressure is well-established: excess weight forces your heart to work harder to pump blood around your body, increasing the pressure in your arteries. When you lose weight, this demand decreases, allowing blood pressure to normalise.
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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.
How Weight Loss Affects Blood Pressure
The mechanism is straightforward: excess body weight, particularly fat stored around the abdomen, increases the resistance in blood vessels and can trigger the release of hormones that raise blood pressure. Losing weight reverses these effects.
Research shows:
- A 1 kg loss in weight can reduce systolic blood pressure (the upper number) by approximately 1 mmHg
- Losing 10 kg can reduce systolic pressure by around 5–20 mmHg, depending on how much weight you lose and your starting point
- Weight loss also improves kidney function, which helps regulate blood pressure naturally
- Benefits appear relatively quickly—many people see improvements within weeks of starting to lose weight
The NHS recommends that adults with high blood pressure should aim for a sustainable weight loss of 0.5–1 kg per week through reduced calorie intake and increased physical activity. This rate of loss is more likely to be sustained long-term and is associated with better overall health outcomes.
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 Weight Management and Blood Pressure Control
The NHS recognises weight management as a primary strategy for controlling high blood pressure without medication, or reducing the dose of blood pressure medication needed. High blood pressure (hypertension) affects around 1 in 4 UK adults, and obesity is a major risk factor.
If you're overweight with high blood pressure, your GP may recommend a structured weight management programme before prescribing additional medication. Use our free BMI calculator to check your current weight category, and our weight converter to track progress in the units that feel most natural to you—whether stone and pounds or kilograms. For those considering prescription weight loss support as part of a comprehensive weight management plan, your GP can assess your eligibility and discuss options tailored to your health situation.
- 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 weight do I need to lose to see a drop in blood pressure?
Many people see blood pressure improvements after losing just 5–10% of body weight. For example, a person weighing 100 kg losing 5–10 kg may notice measurable reductions within weeks. However, results vary—your GP can advise on realistic targets based on your individual health profile and current blood pressure readings.
Is weight loss alone enough to control high blood pressure?
Weight loss is highly effective for many people, but some individuals may still need medication alongside lifestyle changes. This depends on how high your blood pressure is, whether you have other health conditions, and your individual response to weight loss. Your GP will monitor your blood pressure and adjust treatment as needed.
What's the best way to lose weight for blood pressure control?
The NHS recommends a combination of reduced calorie intake and increased physical activity, aiming for 0.5–1 kg per week. A Mediterranean diet and reducing salt, alcohol, and sugary foods are particularly beneficial for both weight loss and blood pressure management.
Can prescription weight loss medication help with blood pressure?
Yes. Weight loss medications approved in the UK for weight management, used alongside diet and exercise, may help reduce blood pressure as part of overall weight loss. These are prescription-only and require a clinical assessment to determine suitability. Discuss with your GP or prescriber whether this approach is appropriate for your situation.
How quickly does blood pressure improve after weight loss?
Many people notice improvements within 2–4 weeks of consistent weight loss, though the timeframe varies. Blood pressure may continue to improve as weight loss progresses. Regular monitoring by your GP helps track your progress and adjust any medication 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.