What is BMR and how is it calculated?

BMR (Basal Metabolic Rate) estimates the calories your body uses at rest over 24 hours. We use the Mifflin–St Jeor equation: male = 10·kg + 6.25·cm − 5·age + 5; female = 10·kg + 6.25·cm − 5·age − 161.

How do I switch between US and Metric units?

Use the Units toggle (US or Metric). US entries (ft/in and lb) are automatically converted to metric (cm and kg) behind the scenes so calculations stay accurate.

What is TDEE and which activity factor should I pick?

TDEE is your daily calorie need, computed as BMR × activity factor. Options include: 1.2 (sedentary), 1.375 (exercise 1–3×/week), 1.465 (exercise 4–5×/week), 1.55 (daily or intense 3–4×/week), 1.725 (intense 6–7×/week), and 1.9 (very intense daily or physical job). Choose the one that best matches your routine.

Is BMI or BMR better for planning?

BMI classifies weight relative to height; BMR estimates energy needs. For calorie planning, BMR combined with an activity factor (to get TDEE) is usually more actionable than BMI alone.

How many calories should I eat if my BMR is 1500 to lose weight?

Use the activity table to estimate your TDEE (maintenance). For many people, a modest deficit (about 300–500 kcal/day) from TDEE is a sustainable starting point. Always personalize with professional guidance.

What ages are supported?

The calculator supports ages 10–120, consistent with typical BMR formula guidance shown in the interface.

How accurate are the results?

Results are estimates based on population formulas and your inputs. They’re intended for education and convenience and don’t replace medical or nutrition advice.

Metabolic Age & BMR Calculator

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Metabolic Age & BMR Calculator

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Metabolic Age & BMR Calculator

Instant BMR & TDEE estimates with clear explanations—built for accuracy.

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