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Thermal conductivity directly impacts the performance of organic thermoelectric devices which convert heat into useful electricity. However, quantitatively measuring the bulk thermal conductivity of conjugated polymers remains complicated and hinders the rational design of advanced organic thermoelectric materials and true key performance calculation, figure of merit (ZT). The novel fast scanning calorimetry is adopted to address these limitations for the first time by measuring the heat conduction for conjugated polymeric films. Out of plane thermal conductivity of polydiketopyrrolopyrrole (PDPPT) based polymers and poly (3-hexylthiophene) (P3HT) films are quantitatively captured by directly monitoring heat transfer through tens of micrometer thick polymer films. For undoped polymers, PDPPT displayed a higher out of plane thermal conductivity than P3HT (0.263 vs. 0.168 W m−1 K−1) due to higher backbone …