TDEE calculator online tools compute your total daily energy expenditure, the number of calories your body burns in a full day when accounting for your activity level. This free browser-based tool uses established formulas to estimate your maintenance calories, then shows adjusted targets for fat loss or muscle gain. No signup needed. Knowing your TDEE gives you a reliable foundation for any structured nutrition plan.
Calorie Calculator is a free browser-based tool that estimates daily calorie needs based on age, sex, height, weight, and activity level, and then adjusts the target for a selected goal such as weight loss, maintenance, or weight gain. Knowing your daily calorie target is the foundation of any nutrition-based body composition plan: creating a caloric deficit below your maintenance level leads to fat loss over time, while a surplus supports muscle gain when combined with resistance training. The calculator uses the Mifflin-St Jeor equation to estimate basal metabolic rate and applies an activity multiplier to estimate total daily energy expenditure, then adjusts for the selected goal. Results are shown as a daily calorie target with a breakdown by goal. No account or installation is required.
Calorie Calculator provides a data-driven starting point for nutrition planning based on one of the most validated methods available for estimating energy expenditure without laboratory equipment. The Mifflin-St Jeor equation is consistently ranked as the most accurate of the commonly used predictive equations in research comparisons, though even the most accurate formula carries an error margin of roughly 10 percent for any given individual, since metabolic rate is influenced by factors such as genetics, hormonal status, and gut microbiome that cannot be captured by height, weight, age, and sex alone. For this reason, the calorie estimate from the calculator is best treated as a starting point to be calibrated against actual outcomes over two to four weeks of consistent tracking. If weight is not changing as expected, the calorie target is adjusted in 100 to 200 calorie increments until the desired rate of change is observed. The activity multipliers range from sedentary (office job with little exercise) to very active (intense physical work or training twice daily), and selecting the correct multiplier is the most impactful judgment call in the calculation. Most people overestimate their activity level, which leads to an overestimated maintenance calorie figure. Starting with the sedentary multiplier and adjusting upward if weight is decreasing faster than expected is a conservative approach. The tool also pairs naturally with Macro Calculator for distributing the calorie target across protein, carbohydrates, and fat. It runs free in the browser with all calculations done locally.