Find out exactly how many calories your body needs each day based on your personal stats and goals.
Fill in your details for a personalized estimate.
Want medical support for your weight goals? Our NP-led telehealth weight loss program is available in California and Nevada.
Book a SendSlim Visit →This tool uses the Mifflin-St Jeor equation — the most accurate formula for estimating calorie needs. It calculates your Basal Metabolic Rate (BMR) first, then adjusts for your activity level to get your Total Daily Energy Expenditure (TDEE).
Your Basal Metabolic Rate is the number of calories your body burns just to keep you alive — breathing, pumping blood, and keeping your organs working — with no movement at all.
A deficit of 500 calories per day leads to about 1 pound of weight loss per week. Going below 1,200 calories (women) or 1,500 calories (men) without medical supervision is not safe. These are estimates — individual metabolism varies significantly.
If you have tried calorie management without results, or if you have diabetes, thyroid issues, or take medications that affect weight, a medically supervised program may be the right next step.