Calorie Calculator
Estimate daily energy needs using age, sex, weight, height, and activity.
Guide: Calorie Calculator
Daily calorie needs depend on basal metabolism, body size, age, sex, and activity. This page summarizes total daily energy expenditure (TDEE) ideas and points you to related tools while emphasizing that apps cannot replace personalized nutrition advice. Energy balance—calories in versus calories out—is simplified science with complicated human behavior layered on top, so treat any number as a starting guess, not a verdict.
What goes into a calorie target
BMR is resting burn; activity multipliers add exercise and daily movement. Athletes and people recovering from illness may need tailored plans.
Thermic effect of food (digestion cost) and non-exercise activity thermogenesis (fidgeting, posture) also contribute but are often folded into activity factors.
Cutting, maintenance, and surplus
Fat loss usually requires a sustained modest deficit; muscle gain often needs resistance training plus a small surplus or careful recomposition strategy.
Aggressive deficits can backfire with fatigue, hormone disruption, or rebound eating—sports dietitians help tune the slope.
How our other tools connect
Start from BMR, layer activity into TDEE mentally, then track weight trend for a few weeks to see if your assumed maintenance was accurate.
If your on-page tool embeds equations, align inputs with the same units (kg, cm) you use on BMI pages for consistency.