Estimate your Active Metabolic Rate in calories per day from sex, age, weight, height, and activity level using imperial or metric units.

AMR Calculator

Enter your details to estimate your Active Metabolic Rate (calories/day).

Imperial (lb, in)
Metric (kg, cm)
Male
Female
lb
in
Male
Female
kg
cm
Your AMR
— kcal/day
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How this is calculated ▾

AMR Formula

The AMR Calculator estimates your Active Metabolic Rate by first calculating BMR, then multiplying BMR by your selected activity factor.

AMR = BMR * Activity Factor

Male BMR = 66.47 + 13.75*W_lb + 5*H_in - 6.76*A

Female BMR = 655.1 + 9.563*W_lb + 1.85*H_in - 4.676*A

Metric inputs:
W_lb = W_kg * 2.20462
H_in = H_cm * 0.393701

kJ/day = AMR * 4.184
kcal/week = AMR * 7
  • AMR = Active Metabolic Rate, in calories per day
  • BMR = Basal Metabolic Rate before activity is applied
  • Activity Factor = multiplier based on your selected activity level
  • W_lb = weight in pounds
  • W_kg = weight in kilograms
  • H_in = height in inches
  • H_cm = height in centimeters
  • A = age in years

The Imperial tab uses your weight in pounds and height in inches directly. The Metric tab converts kilograms to pounds and centimeters to inches before applying the same BMR formula. The sex selection determines which BMR equation is used. The activity level multiplies BMR to estimate AMR. The result is shown in kcal/day, with additional conversions to kJ/day and kcal/week.

Activity Factors Used for AMR

Activity level Multiplier Typical use
Light 1.25 Desk job, little exercise
Moderate 1.35 Exercise about 3 to 4 times per week
Heavy 1.50 Exercise about 5 to 6 times per week
Extra Heavy 1.85 Daily hard training or physically demanding labor

AMR Result Conversions

Output Formula What it means
kcal/day AMR Estimated daily calories burned
kJ/day AMR * 4.184 Same energy amount in kilojoules
kcal/week AMR * 7 Estimated weekly calorie burn

AMR Examples

Example 1: Imperial male

A 30-year-old male weighs 160 lb, is 68 in tall, and selects Moderate activity with a multiplier of 1.35.

BMR = 66.47 + 13.75*160 + 5*68 - 6.76*30
BMR = 2403.7

AMR = 2403.7 * 1.35
AMR = 3245 kcal/day

Example 2: Metric female

A 30-year-old female weighs 72 kg, is 173 cm tall, and selects Moderate activity with a multiplier of 1.35.

W_lb = 72 * 2.20462 = 158.73
H_in = 173 * 0.393701 = 68.11

BMR = 655.1 + 9.563*158.73 + 1.85*68.11 - 4.676*30
BMR = 2158.8

AMR = 2158.8 * 1.35
AMR = 2914 kcal/day

AMR FAQ

What is the difference between AMR and BMR?

BMR is the estimated number of calories your body burns at rest. AMR includes activity by multiplying BMR by an activity factor. If you exercise more or have a physically demanding job, your AMR will be higher than your BMR.

Which activity level should you choose?

Choose the level that best matches your normal week, not your hardest day. If you mostly sit and only exercise occasionally, use Light. If you train several times per week, use Moderate or Heavy. If you do hard daily training or physical labor, use Extra Heavy.

Why can AMR results differ between calculators?

Different calculators may use different BMR equations, activity multipliers, rounding rules, or unit handling. This calculator uses the displayed male or female BMR formula, applies the selected activity factor, then rounds the final AMR to the nearest whole calorie per day.