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
Weekly Weight Loss Chart — What's a Healthy Rate?
A weekly weight loss chart helps you track progress safely and realistically. The NHS recommends losing weight at a rate of 0.5 to 1 kg (1 to 2 lbs) per week for sustainable, long-term results. This guide explains what a healthy weekly weight loss chart looks like, how to track it effectively, and when prescription weight loss medication might support your progress. Whether you're managing weight loss in the UK through lifestyle changes alone or with medical support, understanding realistic expectations is crucial.
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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.
Safe Weekly Weight Loss Rates and Chart Expectations
The NHS safe rate: Losing 0.5 to 1 kg per week is considered healthy and sustainable. This typically requires a calorie deficit of around 500 kcal per day, which results in losing approximately 0.5 kg weekly. A simple weekly weight loss chart might show: Week 1: 0.5 kg down, Week 2: 1 kg down, Week 3: 0.5 kg down — noting that losses fluctuate due to water retention, hormones, and food timing.
What not to expect: Rapid weekly loss of 2–3 kg is possible in the first week (mostly water) but unsustainable and risks muscle loss. Very low calorie diets (under 800 kcal daily) can achieve faster loss but require medical supervision and are typically only recommended in specialist NHS weight management services.
- Week-to-week variation is normal — plateaus of 1–2 weeks don't mean failure
- Weighing yourself weekly (same day, same time) gives the clearest chart trend
- Monthly and 3-monthly progress often shows clearer trends than daily fluctuations
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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.
Weight Loss Medication and Weekly Progress Charts
For adults eligible for prescription weight loss medication — those with a BMI of 30 or above, or 27–29.9 with weight-related health conditions — GLP-1 weight loss injections like semaglutide (Wegovy) or tirzepatide (Mounjaro) can support faster progress. Clinical trials showed that participants taking these medications alongside reduced-calorie diets achieved greater average weight loss than diet alone. Our GLP-1 weight loss calculator can help you estimate potential progress with medication at different doses.
However, weekly charts with medication should still target 0.5–1 kg per week as a baseline safe rate. Use our free progress tracker to log weekly results and spot trends over time. If you're considering prescription weight loss support, your GP or a licensed prescriber can assess whether medication is appropriate for your individual circumstances and help you set realistic chart targets.
- 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 should a healthy weekly weight loss chart show?
A healthy chart shows a loss of 0.5 to 1 kg per week on average. Week-to-week may vary due to water retention and hormones, so look at 4-week trends rather than single weeks. Some weeks you may lose 0.8 kg, others 0.3 kg — this is normal. The NHS recommends this steady rate for sustainable results.
Is it normal for weekly weight loss to plateau?
Yes, completely normal. Plateaus lasting 1–2 weeks often happen as your body adapts. This doesn't mean you've failed — it's a natural part of the process. Ensure your calorie deficit is still correct, drink enough water, and stay consistent. Plateaus typically break after a week or two.
Why does weight fluctuate so much week to week?
Water retention, food timing, hormones, and digestive transit all affect weekly numbers. Women may retain water around their menstrual cycle. Salt intake affects fluid retention. This is why tracking monthly progress and using our progress tracker is more reliable than obsessing over single weeks.
Can prescription weight loss medication change my weekly targets?
Medication like Wegovy or Mounjaro may help you achieve consistent 0.5–1 kg weekly losses more easily by reducing appetite. Clinical evidence shows these GLP-1 medications support greater average weight loss when combined with a reduced-calorie diet. Your prescriber will discuss realistic targets with you.
How often should I weigh myself for an accurate chart?
Weigh yourself once per week on the same day and time (ideally morning, after the toilet, before eating). Weekly weighing gives a clearer trend than daily weighing, which shows too much water fluctuation. Record your result and plot it on your chart to spot the real progress pattern.
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.