The size of the spleen is significantly influenced by body size and gender. The SplenoCalc app is used to calculate the probable percentile of the individual spleen size. The algorithm of the SplenoCalc app is based on height and gender, corrected for the normal homeostatic spleen lengths and volume (for women between 155 and 179 cm and for men between 165 and 199 cm height).The SplenoCalc App performs this calculation and contains further information.