Biology Calculation Formulae

Total Magnification = eyepiece lens magnification x objective lens magnification 

Magnification =   image size  

                          real size

Rate =   1000  

            time 

Energy in Food (in J) =

mass in water (in g) x temperature change of water (in c) x 4.2

Energy per gram of food (in J/g)  =   Energy in food (in J) 

                                                           Mass of food (in g)

BMI =    weight (in kg)    

            height (m)2

Waist-to-hip ratio =   waist circumference  

                                hip circumference 

Light Intensity =       1      

                           distance 2

Rate of Diffusion =surface area x concentration difference

                                           thickness of membrane

Cardiac Output = heart rate x stroke volume 

Efficiency =    energy transferred to next level    x100

                    energy available at previous level