You can determine a healthy weight for women over 40 with WebMD's BMI calculator. The calculator offers information on healthy weight and BMI levels based on your age and a number of other factors.
To use the Body and BMI Calculator at WebMD, input your gender and current height, weight, age and pant size, then select whether you want to lose weight, gain weight or stay the same weight. The calculator provides an ideal weight range based on your age, size and gender. The WebMD calculator also provides information about your BMI, waist-to-height ratio and suggested daily calorie consumption based on how much weight you want to lose or gain. The heart rate tab provides a target heart rate for general fitness, high-intensity fitness and workout recovery, with activity suggestions to help you reach the target heart rate.
Health.gov also suggests using the BMI to determine a healthy weight. A BMI between 19 and 24 is indicative of a healthy weight regardless of your age. The website provides a BMI chart to determine a healthy weight based on your height and gender and a calorie chart to help you determine the calorie needs for your gender, age and lifestyle. The website also provides tips to help you reach the recommended weight and information on balancing a healthy weight with a happy lifestyle.