The ecg represents the record of the potential fluctuations due to summated action potentials of myocardial fibers during the cardiac cycle. the electrical heart axis (eha) in the ecg recordings is represented by the mean qrs axis which is the average projection in the frontal plane of the electrical activity vector of ventricular depolarization. the assessment of eha from net voltages of qrs complexes in bipolar and augmented unipolar leads was carried out in the frontal plane using different formulae: avf/i, 2avf/(√3i), (i+2iii)/(√3i), √3avf/(avl-avr) and using hexaxial reference system. comparable results were obtained with avf/i, 2avf/(√3i), and (i+2iii)/(√3i) for the prediction of normal eha and left axis deviation (lad) with 2avf/(√3i) formula methods showing highest similarity with the hexaxial system. however, none of the formula was suitable for the prediction of right axis deviation (rad) and extreme axis deviation (ead). the eha obtained from the 2avf/(√3i) leads after applying correction did not differ significantly from the values without correction avf/i. the eha values calculated using four formula methods different non-significantly except the (i+2iii)/(√3i) and √3avf/(avl-avr) formula in the prediction of normal eha. for all practical purposes, 2avf/(√3i) and (i+2iii)/(√3i) formulae may be used for rapid eha computation of normal heart axis and lad. these two formulae may be tested for designing population specific nomogram of normal eha and lad with large number of cases.