A simple system for the estimation of stem volume is presented based on the compatible stem profile and volume equations. This system can directly predict the stem volume above breast height from measurements of stem diameter at breast height and at an another point along the upper stem, and does not require any sample data for determining a parameter of volume equation. In comparison with the prediction accuracy of existing volume equations from the literature, using data fromCryptomeriajaponicaD. Don,ChamaecyparisobtsusaEndl., andPseudotsugamenziesii(Mirb.) Franco, this system has the advantage of reducing prediction error.