BMR (Mifflin, Men)

This formula estimates a man's basal metabolic rate, meaning the number of calories his body would burn in a day if he were completely at rest. It is based on a regression model fitted from measurements of energy use, so height, weight, and age are combined because larger bodies need more energy to maintain basic functions, while energy needs tend to decline with age. The result is an estimate of resting calorie needs, not a full-day total that includes exercise, walking, digestion, or other activity.

Use it when estimating a baseline calorie target for nutrition planning, such as setting up a diet, comparing energy needs across different body sizes, or calculating total daily energy expenditure after adding an activity multiplier. It is useful in fitness, weight-management, and general health contexts when you need a quick resting metabolism estimate for an adult man.

• Using pounds or inches instead of kilograms and centimetres
• Treating BMR as total daily calories instead of resting calories only
• Forgetting that the formula is specifically for men and using it for women without changing the constant