Waist not weight: why your waist measurement matters more than your weight

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Should we be shunning the scales in favour of a tape measure? Evergreen Life looks at why your waist measurement might be a better indicator than your weight.

We know that obese people have poorer COVID outcomes. It seems like a simple connection with weight. But actually weight and fat are not as tightly related as you might think.  In fact, stepping on the scales to measure your weight can be misleading as a way of predicting health problems. The body mass index (BMI) is a measure that uses your height and weight to work out if your weight is healthy. But it may not always give you the full picture. Your body fat percentage or waist measurement are more significant indicators or predictors of potential health problems.

It might be more helpful to ditch the terms ‘overweight/underweight’ for ‘overfat/underfat.’ In 2017, an estimated 70% of the world had become overfat – with that figure rising to over 90% in countries like the USA and Greece. In the UK nearly 87% of men are overfat, with around 77% of woman in the same bracket. But what does that mean? Overfat describes a body fat level that can actually hurt your health. For men, a healthy body fat percentage lies between 8-19%; for women 21-33% is ideal.

Let’s take a look at why weight and BMI are potentially misleading, and how to get a more accurate picture of your health using the simple tape measure.

You must speak to your GP about any unintentional increase or decrease in your weight. This may be a sign of significant illness.

Weighing up the scales

Evergreen Life’s Wellbeing Survey reported that body weight scales were by far the most common method of measuring health and wellbeing. That’s probably because it’s become like a morning ritual for us – the scales looming in the corner of the bathroom ready for us to step onto before we start our day.

But weight scales don’t know whether you’re a muscular athlete or a growing teenager. And that’s a key issue.

What if you’re exercising to lose weight? The scales don’t consider that you might experience a healthy amount of muscle development and that extra muscle has to weigh something! This can be more than a bit disheartening to see you’ve gained weight after working hard at the gym.

Person stepping onto weight scales BMI

The problem with BMI

How about BMI – or Body Mass Index? It’s at least taking into consideration your height... Anything between 18.5 and 25 is an average BMI reading. But, a BMI of over 25 says you’re ‘overweight’ and above 30 indicates obesity. It’s quick and doctors can easily evaluate a patient’s risk of heart disease, diabetes and other illnesses like cancer and osteoarthritis. But, there are some instances which can lead to a deceptive BMI result.

BMI doesn’t really measure body fat. You might be a normal weight according to your height, but you can still carry too much body fat and even classify as obese. This means you could be likely to experience some of the same medical risks in people who are more obviously overweight. Dr Brian Fisher, GP in South East London and Strategy and Clinical Director at Evergreen Life, highlights that "measuring your waist circumference seems to give you a better idea of your risk of heart disease than measuring your BMI.”

Also, BMI doesn’t determine the location of fat in your body. You might have a high BMI, but the fat is stored in your hips. Another person with a similar BMI might have a lot of belly fat – or visceral fat – which causes many dangerous health conditions including certain cancers.

BMI reading weight mass

Measuring your body fat

To take an accurate measurement of your body fat, you’d need a costly scan. You could also consider buying bio-impedance scales that send electrical pulses through your body to “read” how much body fat you have.

The US Navy have also developed a way to estimate body fat too, using age, gender, height, and neck measurements. There are a few calculators online.

One simple ways to estimate body fat is to simply measure your waist circumference and you can store it in the Evergreen app!

How to measure your waist

  1. Grab a tape measure!
  2. Wrap the tape measure around your waist at the level of your belly button
  3. Breathe out normally
  4. Check the number on the tape measure
  5. Store your waist measurement in the records section of the Evergreen Life app so you keep track.

Don’t worry about doing this every day! Do what works for you, but once per month is a good idea. Set a reminder in your phone to measure it at the same time every month so it’s most accurate.

taking waist measurement with a tape measure

So, what is a healthy waist measurement?

Put simply, you should probably try to lose weight if you’re a man with a waist more than 94cm (37 inches) or a woman with a waist of more 80cm (31.5 inches).

Current NHS guidance suggests you may at very high risk of some serious health conditions and should see a GP if your waist is more than 102cm (40in) or more for men or 88cm (34.5in) or more for women.


Your waist hip ratio can also shed light on body fat and the Evergreen Life app can help you with this too.

Go to records>personal records>measurements and find the waist:hip section. Add your waist and hip measurements here and the app will to the rest. If you don’t have the app, just divide your waist by your hip measurement (in the same units):

  • For men = above 1 is too high. Aim for below 0.95 to reduce risk of disease.
  • For women = over 0.85 is too high. Below 0.8 puts you at a lower risk of disease.

If you’re worried about your waist measurement, it’s worth thinking about your diet and exercise regime. There are links to Evergreen articles below that you might find helpful.

Keep track

Interested in monitoring your body measurements? You can track changes with the Evergreen Life app. Its personal health and fitness monitor lets you record various results including waist, body fat, BMI and blood pressure, so you can understand your fat loss progress and maintain your general wellbeing. You can also receive more personalised tips on how to improve other aspects of your wellbeing, such as diet, sleep and mental health. By recording what you’re doing and how it effects you in the app, you’ll also will help us get a greater understanding of what works and what doesn’t. Who knows what you may help us learn?

Written by
Evergreen Life

Article updated:
June 6, 2018
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