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This calorie calculator is based on the Schofield Equation. This is a scientific formula for calculating your daily caloric needs, based on your age, weight, gender and activity level.

The formula for losing weight is based on a 500 calorie deficit per day. For your information, the NHS advice on weight-loss is that :

Men should eat and drink no more than 1,900kcal a day
Women should eat and drink no more than 1,400kcal a day

The formula for gaining weight is based on adding an extra 500 calories per day (3500 per week) in order to gain 1lb per week. This should be used with caution and it is recommended that you consult a doctor or dietician before commencing a weight-gain plan.

These figures are an approximation of your caloric needs and are not intended, nor is it implied, that they should be a substitute for professional advice from a dietician or doctor. By using this calculator you are agreeing that you are aware that changes to your current diet can have both risks and benefits. In following any suggested dietary tips, you are confirming that you have evaluated them in line with your own lifestyle and are informed about the risks and benefits involved in masking dietary and lifestyle changes. For more information, please see the NHS guide on weight loss and healthy eating.

Please note that the Schofield Equation has an SEE (Standard error of estimation) of around 100 to 150 calories, which means that it is accurate to this number of calories. Therefore, you should use this figure as a base level and monitor/adjust it according to your needs.

Once you have calculated your calories you can choose one of the calorie-measured meal plans in the nutrition section or you can use My Fitness Pal to monitor your food intake.