Important Info

How does the frame size adjustment work?

BMI is an imperfect tool for calculating whether your weight is healthy or not, because it doesn’t take into account the size and shape of your body – for example, a very petite, small boned person may have a BMI below the healthy range, despite being a healthy weight for her body type. Likewise, a very broad or muscular person may have a BMI in the overweight or even obese category, when really they’re not overweight at all, just larger-framed.

For this reason, the Ultimate Weightloss Calculator offers a frame size adjustment tool, to give you an alternate result if you feel the standard BMI formula doesn’t apply to you very well. If you choose “small frame size” or “large frame size”, the results are adjusted by 10%.

Because this adjusted formula is NOT medically approved. The adjusted results should DEFINITELY NOT be taken as medical advice.

What your BMR means

Your BMR (Basal Metabolic Rate) is the number of the calories you burn just to keep your body functioning, without taking your activity level into account. You would use this many calories even if you just lay in bed all day and didn’t move at all.

What your TDEE means

Your TDEE (Total Daily Energy Expenditure) is your BMR, plus a certain number of calories to take into account your activity level. It’s a rough guide to how many calories you need each day.

What your BMI means

BMI (Body Mass Index) is a measure used to quantify the mass of an individual, so they can be categorised according to their weight. It’s often used for health screening and provides a relatively objective measure of a person’s weight relative to their height. A high BMI generally indicates a high body fatness, but it is not diagnostic of this – for example, very tall people or athletes with considerable body mass often have misleadingly high BMI results.

Less than 15 = Very severely underweight

From 15.0 to 16.0 = Severely underweight

From 16.0 to 18.5 = Underweight

From 18.5 to 25 = Normal (healthy weight)

From 25 to 30 = Overweight

From 30 to 35 = Obese Class I (Moderately obese)

From 35 to 40 = Obese Class II (Severely obese)

Over 40 = Obese Class III (Very severely obese)

How fast should you lose weight?

It’s tempting to lose weight as fast as possible – but what’s the point, if you put it straight back on again? Losing weight gradually and healthily is the best way to ensure you maintain your goal weight when you reach it.

If you need to lose more than 50lbs in total, 2lbs per week is a realistic, healthy and maintainable weight loss rate to aim for.

If you need to lose between 20 and 50lbs in total, 1lb per week is a realistic, healthy and maintainable weight loss rate to aim for.

If you need to lose less than 20lbs, 0.5lbs per week is a realistic, healthy and maintainable weight loss rate to aim for.