BMR & TDEE Calculator
healthCalculate Basal Metabolic Rate and Total Daily Energy Expenditure using Mifflin-St Jeor formula.
Calories burned at complete rest
Calories to maintain your current weight
Caloric Targets by Body Goal
Understanding BMR vs TDEE & Safe Caloric Deficits
Your Basal Metabolic Rate (BMR) represents the base energetic floor required to sustain vital organ function at rest.
Multiplying BMR by your physical activity factor gives your Total Daily Energy Expenditure (TDEE). Creating a modest deficit of 500 kcal per day below TDEE produces a sustainable 0.5 kg (1 lb) fat loss per week without triggering severe metabolic slowdown.
How to Use & Features
The BMR & TDEE Calculator computes output instantly as you type with zero reload. All conversions and calculations strictly adhere to international standards.
- Input your value into the designated input field.
- Select your source and target units from the dropdown menus.
- Click the copy button beside the result to copy to your clipboard.
Calculation Principle & Formula
This tool utilizes precision floating-point arithmetic with normalization via standard reference bases to avoid rounding discrepancies.
Frequently Asked Questions
Q. Are the calculation results reliable?
Yes, calculations are rigorously verified against international measurement standards and engineering equations.
Q. Does this work smoothly on mobile devices?
Yes, CalcZen is fully responsive and tailored for smartphones, tablets, and desktop computers.