In modern scientific usage, weight and mass are fundamentally different quantities: mass is an intrinsic property of matter, whereas weight is a force that results from the action of gravity on matter: it measures how strongly the force of gravity pulls on that matter. The meaning of WEIGHT is the amount that a thing weighs. How to use weight in a sentence. Synonym Discussion of Weight. Healthy weight depends on age, height, gender, body composition and more. How to use BMI, waist circumference and lab tests for weight loss goals. Use the tool on this page to calculate your BMI. Having a BMI higher than 24.9 may mean you are overweight. Note that these are approximate values, and they are intended to be used only as a rough guide. If you are worried about your BMI or are trying to lose weight, talk to your primary care doctor. How much you should weigh for your height and age depends on several factors. Learn more about how to measure health and weight, such as BMI, body fat percentage, and other ratios. Build healthy habits with a weight-loss program and nutritionist-designed food plan. Get support from expert coaches to help you lose weight and keep it off. This free ideal weight calculator estimates ideal healthy bodyweight based on age, gender, and height based on several popular formulas.