Oxford Calculator
Modern BMR formula based on European populations with age considerations
How the Oxford Formula Works
Published in 2005, this is one of the more recent BMR formulas. It was developed using data from European populations and takes age brackets into account, providing different equations for people under and over 30 years old.
Men: BMR = 662 - (9.53 × age) + PA × (15.91 × weight + 539.6 × height)
Women: BMR = 354 - (6.91 × age) + PA × (9.36 × weight + 726 × height)
Frequently Asked Questions
Different calculators may use different formulas or activity multipliers. We use the Mifflin-St Jeor equation, which is considered one of the most accurate for most people. However, individual metabolism can vary by 10-20% from these estimates.
These are average daily targets. It's normal to eat slightly more some days and less on others. Focus on your weekly average rather than being exact every single day. Listen to your body's hunger and fullness cues.
If you're not seeing results after 2-3 weeks, you may need to adjust. Your actual metabolism might be higher or lower than calculated. Try adjusting by 100-200 calories and monitor for another 2 weeks. Also ensure you're tracking your food accurately.
The 30/40/30 split (protein/carbs/fat) is a balanced approach suitable for most people. However, athletes, people with medical conditions, or those following specific diets (keto, vegan, etc.) may need different ratios. Consult a nutritionist for personalized recommendations.