Daily energy expenditure by activity.. TDEE Calculator is a free online tool from the ToolsRift Finance & Health Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Enter your age, sex, height, weight and activity level. The calculator applies the Mifflin-St Jeor formula to estimate your daily maintenance calories.
Total Daily Energy Expenditure is the calories you burn per day, including your basal metabolic rate plus activity. It is your maintenance calorie level.
This tool finds BMR with the Mifflin-St Jeor equation, then multiplies by an activity factor (1.2 sedentary to about 1.9 very active) to estimate TDEE.
Eat below your TDEE to lose weight and above it to gain. A deficit or surplus of around 500 calories a day changes weight by roughly half a kilo per week.