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
Ideal Weight Charts for UK Adults
An ideal weight chart shows the healthy weight range for your height based on BMI. According to NHS guidelines, a healthy BMI falls between 18.5 and 24.9, which translates to specific weight ranges depending on your height. This guide explains how to use BMI-based ideal weight charts in the UK, how your healthy weight range is calculated, and how to find your personal ideal body weight target. Use our free BMI calculator to discover your current BMI and ideal weight range instantly.
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.
Healthy Weight Range by Height — UK BMI Framework
The ideal body weight for any person depends on their height and is best understood through the BMI framework. The NHS defines a healthy weight range as a BMI between 18.5 and 24.9. To find your ideal weight in kilograms, multiply your height in metres squared by 18.5 (lower bound) and 24.9 (upper bound).
For example, for someone 1.70m tall:
- Lower healthy weight: 18.5 × (1.70)² = 53.4 kg (8 stone 6 lbs)
- Upper healthy weight: 24.9 × (1.70)² = 71.8 kg (11 stone 3 lbs)
This means the healthy weight for height spans a range, not a single number. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — with healthy weight starting at BMI 18.5 but capping at 22.9 rather than 24.9, reflecting higher health risks at the same BMI.
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.
Using Ideal Weight Charts and the BMI Calculator
Rather than relying on static ideal weight charts alone, the most accurate approach is to calculate your personal healthy weight range using your specific height. Our free BMI calculator on this page instantly shows your current BMI and your personalised healthy weight range in both kilograms and stone. Simply enter your height and current weight to see where you fall on the NHS scale.
Remember that average UK weight varies widely — the average man weighs around 85.7 kg and the average woman around 71.6 kg — but average does not mean ideal or healthy. Your ideal weight depends on your individual height, not population averages. If you want to track progress towards your ideal weight range, our free progress tracker helps you log changes over time.
- 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 is the ideal weight for my height according to BMI?
Your ideal weight range depends on your height. Use the formula: healthy weight = 18.5 to 24.9 × height (metres)². For example, at 1.75m tall, the healthy range is 56.6 kg to 76.2 kg (8st 13lbs to 12st 0lbs). Use our free BMI calculator for instant personalised results.
Are ideal weight charts the same for men and women?
BMI-based healthy weight ranges are the same for men and women at the same height — BMI does not differ by sex. However, body composition may differ; men typically have more muscle mass. Your GP can advise on what's healthy for your individual circumstances.
Is average UK weight the same as ideal weight?
No. The average UK adult weighs around 85.7 kg (men) or 71.6 kg (women), but average is not ideal. Ideal weight is based on BMI — 18.5 to 24.9 — which is healthier than the current UK average. Your ideal weight depends on your height, not population statistics.
Do lower BMI thresholds apply to me?
Yes, if you're of South Asian, Chinese, Black African, or Black Caribbean heritage. The NHS recommends a healthy BMI of 18.5 to 22.9 for these groups rather than 18.5 to 24.9, due to higher cardiovascular and diabetes risk at the same BMI. Check with your GP for personalised guidance.
How do I use ideal weight charts to set a weight loss goal?
Find your height on an ideal weight chart and note the upper end of the healthy BMI range (BMI 24.9) — this is a realistic target. Use our weight converter to switch between kg and stone. Our progress tracker lets you log weekly changes and visualise progress toward your ideal weight range.
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.