Weight Loss Calorie Calculation: The Precise Guide (BMR + TDEE)

How to precisely calculate your weight-loss calories using BMR and TDEE with the Mifflin-St Jeor equation and a ready-to-use calculator.

Weight Loss Calorie Calculation

No weight loss happens without precise calorie calculation. The idea is simple: eat below your body's need and you lose. The problem: most people don't know their real number — so they eat blindly and wonder why nothing moves.

The Number You Need: TDEE

TDEE = total daily energy expenditure. Built from:

  1. BMR — resting need.
  2. Activity multiplier.

Mifflin-St Jeor (most accurate)

Men: BMR = 10×kg + 6.25×cm − 5×age + 5 Women: BMR = 10×kg + 6.25×cm − 5×age − 161

Activity Multipliers

Sedentary ×1.2 · Light ×1.375 · Moderate ×1.55 · High ×1.725 · Athlete ×1.9.

TDEE = BMR × multiplier

Real Example

Male, 30, 175 cm, 85 kg, trains 4×/week:

  • BMR = 1799
  • TDEE = 2788 kcal/day
  • For 0.5 kg/week loss → eat 2288 kcal.

Use the Calculators

We built Calories Calculator and TDEE Calculator using Mifflin-St Jeor.

How Big a Deficit?

  • Slow & safe: 300-500 kcal → 0.5 kg/week.
  • Medium: 500-750 → 0.75 kg.
  • Fast (short-term): 750-1000 → 1 kg — not sustainable beyond 2 months.

Safety floor: never below BMR × 1.1.

Common Mistakes

  • Overestimating activity.
  • Not weighing oil and sauces.
  • Eyeballing instead of a food scale (can be off by 400 kcal/day).
  • Not recalculating TDEE every 5 kg lost.

Connect It to Your Diet

Once you know the number, use the weight-loss diet plan.

MKFIT Does It Automatically

MKFIT app calculates TDEE, builds your food & training plan around it, and auto-adjusts as your weight changes.

Read More

By — founder of MKFIT and CEO of Namra Tech.