Calorie calculator
Find out how many calories you need to reach or maintain a healthy weight
Peer reviewed by Patient infomatics teamAuthored by Patient infomatics teamOriginally published 6 Jul 2025
Meets Patient’s editorial guidelines
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Whether you're aiming to lose weight, gain muscle, or simply maintain your current fitness level, understanding how many calories your body needs each day is a vital first step. This easy-to-use calorie calculator gives you a personalised estimate based on your age, sex, weight, height, and activity level.
Everyone’s calorie needs are different – they depend on your body, your goals, and your lifestyle. Eating too many or too few calories can affect your energy, weight, and overall health.
Use this calculator to estimate your daily calorie requirements.
Patient picks for Obesity and weight loss
General health and lifestyle
Orlistat healthy eating guide
This dietary advice sheet has been provided by Norfolk and Norwich University Hospitals and gives some general information to help you make the recommended changes to your diet. If you need more detailed advice or if you are following a special diet that makes it difficult to make these changes, please ask your doctor to refer you to a registered dietitian.
General health and lifestyle
Obesity and weight loss
If you have obesity or overweight, you have an increased risk of developing various health problems, including cancer, diabetes and heart disease. Even a modest amount of weight loss can help to reduce your increased health risks. The best chance of losing weight and keeping the weight off, is to be committed to a change in lifestyle. This includes eating a healthy diet and doing some regular physical activity.
by Dr Doug McKechnie, MRCGP
Article history
The information on this page is written and peer reviewed by qualified clinicians.
6 Jul 2025 | Originally published
Authored by:
Patient infomatics team
Peer reviewed by
Patient infomatics team
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