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
How to Calculate Your Healthy Weight For Your Height
Finding your healthy weight for your height is straightforward using the NHS BMI method. Your height determines the range of weights considered healthy for your body. In the UK, we use a simple calculation based on your height in metres and weight in kilograms to determine if you fall within NHS guidance ranges. Understanding this calculation helps you set realistic weight management goals and track progress towards better health. Whether you're starting a weight loss journey or simply want to understand where you stand, knowing how to calculate your ideal weight range is an essential first step.
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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.
NHS Healthy Weight Calculation For Your Height
The NHS uses BMI (Body Mass Index) to determine a healthy weight range for your height. The calculation is simple: weight in kg ÷ height in metres squared. A healthy BMI falls between 18.5 and 24.9 according to NHS guidance. To find your healthy weight range, multiply your height (in metres) squared by 18.5 and again by 24.9 — these give your minimum and maximum healthy weights.
For example, if you are 1.70m tall: lower bound = 18.5 × (1.70)² = 53.4 kg (8 stone 5 lbs), upper bound = 24.9 × (1.70)² = 71.8 kg (11 stone 3 lbs). People of South Asian, Chinese, Black African, or Black Caribbean heritage should use lower thresholds: 18.5 to 22.9 for healthy weight, as NHS guidance recognises higher health risks at lower BMI levels for these groups. Use our free BMI calculator above to check your personal healthy weight range instantly in both metric and imperial measurements.
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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.
Why Height Matters For Weight Health
Your height is the foundation of any healthy weight assessment because taller individuals naturally weigh more than shorter people while maintaining the same body composition. A weight that is healthy for someone 6 feet tall may indicate excess weight for someone 5 feet 2 inches. This is why BMI — which accounts for height — is far more useful than weight alone. The NHS uses height-based calculations because they reflect how your weight is distributed across your body and relate directly to health risk factors like type 2 diabetes, cardiovascular disease, and high blood pressure.
Using our weight converter, you can see how your weight translates between kilograms, stone, and pounds. Your GP can provide personalised nhs health advice about what your healthy weight range means for your individual circumstances, especially if you have existing health conditions or are taking medications that affect weight.
- 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 do I calculate my healthy weight range from my height?
Multiply your height in metres by itself, then multiply the result by 18.5 (lower bound) and 24.9 (upper bound). For example, at 1.75m: 18.5 × (1.75)² = 56.6 kg and 24.9 × (1.75)² = 76.2 kg. This gives your healthy weight range according to NHS BMI guidelines. Use our free BMI calculator to calculate this automatically.
Does height affect how much weight I should lose?
Yes, significantly. Taller individuals have a higher healthy weight range than shorter people. Your height determines your target weight range, so someone 5ft 10in and someone 5ft 2in will have different healthy weight ranges even if they weigh the same currently. Your GP or a weight management programme can help you set appropriate height-based targets.
Is there a different calculation for children's height and weight?
Yes. Children use age and sex-specific centile charts, not adult BMI categories. The NHS provides dedicated growth charts for children. Always consult your GP or health visitor about children's healthy weight — never use adult BMI calculations for children under 18.
What if I'm very tall or very short — do the calculations still apply?
The BMI calculation works accurately across all adult heights. However, very muscular individuals or those with certain medical conditions may need individual assessment. Your GP can provide personalised uk health guidance if standard BMI calculations don't seem to reflect your health situation accurately.
Can I use height-based weight calculations to track progress?
Absolutely. Once you know your healthy weight range for your height, you can track your progress using our free progress tracker. Regular monitoring helps you see improvements over time and stay motivated. Remember that healthy progress is typically 0.5–1 kg per week alongside lifestyle changes.
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.