BMR-kalkylator
Upptäck hur många kalorier din kropp förbränner i vila. Basalmetabolismen är grunden för varje kostplan.
What Is BMR and Why Should Personal Trainers Care?
Basal Metabolic Rate (BMR) is the minimum number of calories your client's body needs to maintain vital functions at complete rest – heart function, brain activity, breathing, and cell repair. It typically accounts for 60-75% of total daily energy expenditure. For personal trainers, BMR represents the floor below which you should never set a client's calorie intake. Knowing a client's BMR helps you create realistic, sustainable nutrition plans that protect metabolic health.
How BMR Is Calculated
This calculator uses the Mifflin-St Jeor equation, developed in 1990 and validated as the most accurate BMR prediction formula for healthy adults. It uses weight (kg), height (cm), age, and biological sex as inputs. Men generally have higher BMRs due to greater muscle mass. The formula is: BMR = (10 × weight) + (6.25 × height) - (5 × age) + 5 for males, or - 161 for females.
Applying BMR in Coaching Practice
Use BMR as a safety baseline for nutrition planning. Never prescribe calorie targets below a client's BMR for extended periods – this risks metabolic downregulation, hormonal disruption, and loss of lean muscle mass. When a client reports eating 'very little' but not losing weight, compare their reported intake to their BMR to identify potential tracking inaccuracies or metabolic adaptation.
Factors That Affect BMR
Muscle mass is the largest modifiable factor – each kilogram of muscle burns roughly 13 calories per day at rest, compared to 4.5 calories for fat tissue. Age decreases BMR by approximately 1-2% per decade after 20. Chronic under-eating reduces BMR through metabolic adaptation. Strength training is the most effective intervention for maintaining or increasing BMR in your clients.
BMR Limitations to Keep in Mind
BMR formulas estimate energy expenditure for a 'reference' body composition. Clients with significantly more muscle mass than average (bodybuilders, athletes) may have higher actual BMRs than calculated. Conversely, clients with very low muscle mass may have lower actual BMRs. Use the calculated BMR as a starting point and adjust based on real-world results over 2-4 weeks.
Relaterade verktyg
Följ dina klienters framsteg med FitSuite
Skapa kostplaner baserade på verklig metabolisk data. Hantera klienter, program och framsteg – allt på ett enda ställe.
Testa FitSuite gratis