A non-isothermal DSC method for the determination of the lateral and end surface energies at the polymer crystal/melt interface has been developed. It is based on the analysis of the overall crystallization process which takes place under sporadic and athermal conditions. The validity of the suggested method is tested for the case of polypropylene, polydemethylene terephthalate and polyethylene terephthalate. The calculated values of the lateral and end surface energies are compared with literature data from isothermal experiments. It is found that the agreement is quite satisfactory.